Publish curated MobilityOps source snapshot

.dockerignore

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+.git
+.gitea
+.github
+.gitignore
+.agents
+.codex
+.claude
+.dyad
+.idea
+.vscode
+.vs
+.venv
+__pycache__
+.pytest_cache
+.ruff_cache
+.mypy_cache
+node_modules
+frontend/node_modules
+frontend/dist
+dist
+artifacts
+docs
+deploy
+n8n/**
+!n8n/workflows/
+!n8n/workflows/**
+frontend
+*.tgz
+*.tar.gz
+coverage
+playwright-report
+test-results
+.env
+.env.*
+!.env.example
+*.key
+*.pem
+*.p12
+*.pfx
+secrets
+credentials
+.state
+data
+backups
+*.db
+*.db-shm
+*.db-wal
+*.sqlite
+*.sqlite-shm
+*.sqlite-wal
+*.log
+*.tmp
+*.zip
+*.tar
+*.tar.gz
+.DS_Store
+Thumbs.db

.env.example

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+COMPOSE_PROJECT_NAME=mobilityops
+MOBILITYOPS_ENV=development
+MOBILITYOPS_DEMO_MODE=true
+MOBILITYOPS_PUBLIC_URL=http://localhost:1228
+# Build-time API origin baked into the web bundle. Leave empty: the SPA calls its own
+# origin and nginx proxies /api to the API (required by the CSP connect-src 'self').
+VITE_API_BASE_URL=
+DATABASE_URL=postgresql+psycopg://mobilityops:mobilityops@db:5432/mobilityops
+POSTGRES_DB=mobilityops
+POSTGRES_USER=mobilityops
+POSTGRES_PASSWORD=mobilityops
+# Signs session cookies. With MOBILITYOPS_ENV=production the API refuses to start while
+# this (or MOBILITYOPS_CALLBACK_TOKEN) still holds its placeholder value.
+APP_SECRET=replace-in-production
+TZ=Europe/Brussels
+# Session cookie Secure flag. Development on localhost may use false; production startup
+# requires both an HTTPS public URL and this value set to true.
+SESSION_COOKIE_SECURE=false
+
+# Optional OpenID Connect login. Public demo role buttons remain available when enabled.
+OIDC_ENABLED=false
+OIDC_PROVIDER_NAME=Organisatieaccount
+OIDC_ISSUER_URL=
+OIDC_CLIENT_ID=
+OIDC_CLIENT_SECRET=
+OIDC_REDIRECT_URI=
+OIDC_ALLOWED_EMAIL_DOMAINS=
+OIDC_AUTO_PROVISION=true
+OIDC_DEFAULT_ROLE=rental_employee
+
+# Observability: JSON logs are always enabled. Set a token only if /metrics is exposed
+# outside the private Compose network; Prometheus can send it as a bearer token.
+LOG_LEVEL=INFO
+# Required when the observability profile is enabled. Keep private and high entropy.
+METRICS_BEARER_TOKEN=replace-me-private-metrics-token
+GRAFANA_ADMIN_USER=admin
+GRAFANA_ADMIN_PASSWORD=change-me-before-start
+# Alertmanager sends every firing/resolved alert and the continuous watchdog to this
+# owner-managed receiver. Production must route it to a channel that is actually watched.
+ALERTMANAGER_WEBHOOK_URL=https://n8n.example.test/webhook/mobilityops-alerts
+
+# Verified scheduled PostgreSQL backups (Unraid override).
+BACKUP_INTERVAL_SECONDS=86400
+BACKUP_RETENTION_DAYS=30
+BACKUP_MINIMUM_COPIES=7
+# Restore the newest dump into a disposable database at least weekly. Backup health also
+# requires a successful drill within eight days.
+BACKUP_RESTORE_DRILL_INTERVAL_SECONDS=604800
+# Set both values to copy every verified backup to an independently mounted path.
+BACKUP_SECONDARY_DESTINATION=
+MOBILITYOPS_BACKUP_DIR=./backups/postgres
+MOBILITYOPS_BACKUP_SECONDARY_DIR=./backups/offsite
+# Optional real off-site copy through the official rclone OneDrive adapter. OAuth state
+# lives only in MOBILITYOPS_RCLONE_CONFIG_DIR and must never be committed.
+BACKUP_OFFSITE_INTERVAL_SECONDS=900
+RCLONE_ONEDRIVE_REMOTE=onedrive
+RCLONE_ONEDRIVE_PATH=FleetOps/backups
+MOBILITYOPS_RCLONE_CONFIG_DIR=./.secrets/rclone
+MOBILITYOPS_OFFSITE_VERIFY_DIR=./backups/offsite-verify
+
+# Privacy governance defaults.
+PRIVACY_MINIMUM_BOOKING_RETENTION_DAYS=30
+PRIVACY_AUDIT_RETENTION_DAYS=2555
+PRIVACY_AUDIT_EXPORT_MAX_ROWS=10000
+
+# Demo presentation (fictional org identity, badge/manifest, reset safety valve).
+# DEMO_ALLOW_RESET=false permanently disables POST /api/v1/demo/reset (403), independent
+# of role -- a safety valve for any environment where the dataset must not be rebuildable.
+DEMO_ORGANIZATION_NAME=Northstar Mobility
+DEMO_TIMEZONE=Europe/Brussels
+DEMO_ALLOW_RESET=true
+# Prevent public visitors from repeatedly rebuilding the shared dataset. Concurrent
+# resets are always rejected using both process and PostgreSQL advisory locks.
+DEMO_RESET_COOLDOWN_SECONDS=60
+
+# Operational mode: set MOBILITYOPS_DEMO_MODE=false and provide the first manager.
+# Keep these values in a secret store or an untracked production .env file.
+INITIAL_ADMIN_EMAIL=
+INITIAL_ADMIN_PASSWORD=
+INITIAL_ADMIN_DISPLAY_NAME=Operations Manager
+
+# n8n
+N8N_BASE_URL=http://n8n:5678
+N8N_WEBHOOK_URL=http://n8n:5678/webhook/mobilityops-return
+N8N_ENCRYPTION_KEY=replace-me
+N8N_BASIC_AUTH_ACTIVE=true
+N8N_BASIC_AUTH_USER=admin
+N8N_BASIC_AUTH_PASSWORD=change-me
+# Recipient and sender used by the importable alert workflow. Configure real,
+# monitored addresses in the deployment environment; repository defaults stay synthetic.
+MOBILITYOPS_ALERT_RECIPIENT=alerts@example.test
+MOBILITYOPS_ALERT_SENDER=n8n@example.test
+MOBILITYOPS_CALLBACK_TOKEN=replace-me-n8n-callback-token
+# Sent as the X-Fleet-Ops-Trigger-Token header when Fleet Ops calls the n8n return-
+# processing webhook, so the webhook trigger can require Header Auth instead of being
+# publicly callable by anyone who discovers the URL. Must match the value stored in
+# n8n's "Fleet Ops Webhook Trigger Token" Header Auth credential.
+MOBILITYOPS_WEBHOOK_TRIGGER_TOKEN=replace-me-n8n-webhook-trigger-token
+
+# RAGcore integration
+KNOWLEDGE_PROVIDER=demo
+RAGCORE_BASE_URL=http://ragcore-api:8000
+# Optional existing Docker network used by hosted deployments to reach RAGcore through
+# its private service alias instead of exposing RAGcore on the LAN.
+RAGCORE_DOCKER_NETWORK=
+RAGCORE_TENANT=northstar-mobility-demo
+RAGCORE_WORKSPACE=mobilityops
+RAGCORE_COLLECTION=internal-procedures
+RAGCORE_API_TOKEN=
+# UUID of the RAGcore knowledge space procedures were synced into (see workflow 3).
+RAGCORE_SPACE_ID=
+# Skip the slower generation endpoint temporarily after a timeout/non-2xx response and
+# use the still-grounded extractive search fallback immediately.
+RAGCORE_ANSWERS_CIRCUIT_BREAKER_SECONDS=60
+
+# ITWorx MCP Hub integration. Registration itself is catalog-driven on the Hub's own
+# side (it reconciles its catalog into the gateway; Fleet Ops never pushes a
+# registration call) -- MCP_HUB_BASE_URL is only used here for an honest reachability
+# health check surfaced on the integration status page.
+MCP_HUB_REGISTRATION_ENABLED=false
+MCP_HUB_BASE_URL=http://itworx-mcp-hub:8000
+MCP_HUB_SERVICE_TOKEN=replace-me-mcp-hub-token
+MCP_PROVIDER_ID=fleet-ops

.gitattributes

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+* text=auto eol=lf
+*.sh text eol=lf
+*.ps1 text eol=crlf
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.webp binary
+*.zip binary
+
+# Generated operational evidence is not part of a source release archive.
+/artifacts export-ignore
+/PROJECT_STATE.md export-ignore
+/MASTER_BUILD_PROMPT.md export-ignore
+/FILE_INDEX.md export-ignore

.gitignore

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+# Secrets and local configuration
+.env
+.env.*
+!.env.example
+*.pem
+*.key
+*.p12
+*.pfx
+secrets/
+credentials/
+
+# Python
+__pycache__/
+*.py[cod]
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+.venv/
+.coverage
+htmlcov/
+*.egg-info/
+
+# Frontend and test output
+node_modules/
+frontend/node_modules/
+frontend/dist/
+coverage/
+playwright-report/
+test-results/
+*.tsbuildinfo
+
+# Runtime data and local infrastructure state
+.state/
+data/
+backups/local/
+*.db
+*.db-shm
+*.db-wal
+*.sqlite
+*.sqlite-shm
+*.sqlite-wal
+*.log
+*.tmp
+
+# Generated release/design evidence. Maintained documentation belongs in docs/.
+artifacts/**/final-summary.md
+artifacts/deployment/
+artifacts/design-validation/current/
+artifacts/**/screenshots/generated/
+
+# Local AI/editor state
+.codex/
+.claude/
+.agents/
+.dyad/
+.idea/
+.vscode/
+.vs/
+.DS_Store
+Thumbs.db
+
+# Archives and local release bundles
+*.zip
+*.tar
+*.tar.gz
+*.tgz

CONTRIBUTING.md

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+# Contributing
+
+MobilityOps contributions must preserve fleet-data privacy, deterministic demo behaviour and the fail-closed integration boundaries documented in `SECURITY.md`.
+
+- use synthetic vehicles, customers, bookings, returns, telematics events and identity claims in tests and screenshots;
+- never commit production databases, exports, operator inventories, private service URLs, tokens, backups or generated browser evidence;
+- keep external integrations configurable through environment variables or explicit deployment configuration;
+- document new personal-data fields, retention, authorization, audit and deletion/export behaviour;
+- add negative tests for authentication, authorization, duplicate handling, webhook validation, path containment and stale/unavailable providers;
+- review dependencies, images and browser assets for provenance and redistribution rights.
+
+Run the relevant backend, frontend, migration, integration, Compose and managed-validation gates before review. Security-sensitive findings belong through the private process in `SECURITY.md`.

LICENSE

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+MIT License
+
+Copyright (c) 2026 Jens Caers
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

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+.PHONY: up down logs test lint contracts seed reset n8n-setup n8n-setup-scan demo e2e live-smoke
+
+up:
+	docker compose up --build -d
+
+down:
+	docker compose down
+
+logs:
+	docker compose logs -f --tail=200
+
+test:
+	sh scripts/run-isolated-tests.sh
+
+lint:
+	docker compose -f compose.yaml -f compose.test.yaml run --build --rm api ruff check app tests
+	docker compose -f compose.yaml -f compose.test.yaml run --rm api mypy app
+	cd frontend && npm run lint
+
+contracts:
+	docker compose -f compose.yaml -f compose.test.yaml run --build --rm \
+		-v "$(CURDIR):/repo:ro" api python /repo/scripts/check-contracts.py
+	python scripts/check-source-budgets.py
+
+seed:
+	docker compose exec api python -m app.cli seed --reset
+
+reset:
+	docker compose down -v
+	docker compose up --build -d
+
+# One-time per environment: imports and activates the n8n return-processing workflow.
+# The n8n owner account itself cannot be scripted safely and must be created once at
+# http://localhost:5678/setup (any email/password, no verification required) before
+# this target's activation takes effect. The workflow also needs the "Fleet Ops Webhook
+# Trigger Token" and "Fleet Ops Service Token" Header Auth credentials created manually in
+# the n8n UI before it will actually process a return -- see docs/17-runbook.md.
+n8n-setup:
+	docker compose exec n8n n8n import:workflow --input=//imports/workflows/fleet-ops-vehicle-return.json
+	docker compose exec n8n n8n publish:workflow --id=mobilityops-return-processing
+	docker compose restart n8n
+
+# One-time per environment: imports and activates the scheduled quality-scan workflow.
+# Same owner-account and credential preconditions as n8n-setup above (this workflow only
+# needs "Fleet Ops Service Token").
+n8n-setup-scan:
+	docker compose exec n8n n8n import:workflow --input=//imports/workflows/fleet-ops-data-quality-scan.json
+	docker compose exec n8n n8n publish:workflow --id=mobilityops-scheduled-quality-scan
+	docker compose restart n8n
+
+# Full deterministic demo bootstrap: build, migrate (automatic on api startup), seed.
+demo: up
+	docker compose exec api python -m app.cli seed --reset
+
+e2e:
+	cd frontend && npx playwright test
+
+live-smoke:
+	cd frontend && npx playwright test --config=playwright.live.config.ts

PUBLIC_SOURCE_EXPORT.md

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+# Public source export
+
+This source snapshot was generated from the private canonical repository at revision `0458403e679d5e76f48b4b49d235476631fecf08`. It contains no private Git history or operational evidence. Changes are published from the canonical repository.

README.md

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+# MobilityOps · public source
+
+MobilityOps (Fleet Ops) is a synthetic-data operations demo for vehicle rental and service teams. This repository is the reviewed public source snapshot. Development and deployment happen in a private canonical repository; each public update is generated from a committed revision with a fresh content review.
+
+## Run locally
+
+Copy `.env.example` to `.env`, then run `make demo`. Open <http://localhost:1228>. The demo uses fictional records and a local knowledge provider.
+
+## Contents
+
+- `backend/` — FastAPI domain and API
+- `frontend/` — React interface and browser tests
+- `contracts/` — API and event contracts
+- `knowledge/` and `seed/` — synthetic procedures and records
+
+## Security
+
+Please report vulnerabilities through the contact in [SECURITY.md](SECURITY.md). No operational deployment state or private Git history is included in this repository.
+
+Licensed under the terms in [LICENSE](LICENSE).

SECURITY.md

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+# Security Policy
+
+## Supported versions
+
+| Version | Security support |
+|---|---|
+| Latest tagged PoC release and current `master` | Supported |
+| Older commits, branches and untagged deployments | Not supported |
+
+MobilityOps is a synthetic-data proof of concept, not a production identity,
+payments or public reservation platform. Security fixes target the current
+release line only.
+
+## Reporting a vulnerability
+
+Do not disclose suspected vulnerabilities through a public issue.
+
+Report them privately to `security@itworx.tech` with:
+
+- the affected revision, endpoint or component;
+- reproduction steps and prerequisites;
+- the observed and expected behaviour;
+- the security impact;
+- a minimal proof of concept, without unnecessary personal or secret data.
+
+Receipt should be acknowledged within three business days. An initial
+assessment or request for additional evidence should follow within ten
+business days. Remediation timing depends on severity and reproducibility.
+
+## Scope
+
+In scope:
+
+- MobilityOps backend, frontend, container and deployment code;
+- authentication, authorization, tenant boundaries and audit integrity;
+- database, outbox, backup and restore behaviour;
+- MobilityOps-owned n8n workflow definitions;
+- RAGcore and MCP Hub integration boundaries implemented in this repository.
+
+Out of scope:
+
+- denial-of-service or destructive testing against the hosted demo;
+- social engineering, credential stuffing or physical attacks;
+- synthetic demo-data exposure without a security-boundary failure;
+- vulnerabilities solely inside RAGcore, ITWorx MCP Hub, n8n or another
+  third-party service. Report those to their respective owners.
+
+Do not access data beyond what is required to demonstrate the issue, modify
+shared infrastructure, interrupt other services or retain obtained secrets.
+
+## Coordinated disclosure
+
+Good-faith research that respects this policy and applicable law will be
+handled constructively. Allow a reasonable remediation period before public
+disclosure. Submitted reports and evidence are used only for investigation,
+remediation and verification.

backend/Dockerfile

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+FROM python:3.12-slim-bookworm@sha256:a116514e19457bcb7af7efe9c3dd0b9b71e85b317694e7882a1c52aa15a78134 AS runtime-base
+ARG VCS_REF=development
+ARG BUILD_DATE=unknown
+LABEL org.opencontainers.image.title="Fleet Ops API" \
+      org.opencontainers.image.revision="$VCS_REF" \
+      org.opencontainers.image.created="$BUILD_DATE" \
+      org.opencontainers.image.source="https://fleetops.example.test"
+ENV PYTHONDONTWRITEBYTECODE=1 PYTHONUNBUFFERED=1
+WORKDIR /app
+COPY backend/requirements-prod.lock ./
+RUN pip install --no-cache-dir -r requirements-prod.lock
+COPY backend/pyproject.toml ./
+COPY backend/app ./app
+COPY backend/alembic ./alembic
+COPY backend/alembic.ini ./
+COPY seed ./seed
+COPY knowledge ./knowledge
+COPY backend/entrypoint.sh ./entrypoint.sh
+RUN pip install --no-cache-dir --no-deps -e . && chmod +x ./entrypoint.sh \
+    && addgroup --system app && adduser --system --ingroup app --home /app app \
+    && chown -R app:app /app
+
+FROM runtime-base AS test
+COPY backend/requirements.lock ./requirements.lock
+RUN pip install --no-cache-dir -r requirements.lock
+COPY backend/tests ./tests
+COPY contracts ./contracts
+COPY scripts/check-contracts.py ./scripts/check-contracts.py
+COPY n8n/workflows ./n8n/workflows
+USER app
+
+FROM runtime-base AS runtime
+# Run migrations and the API as an unprivileged user; nothing here needs root.
+USER app
+EXPOSE 8000
+CMD ["./entrypoint.sh"]

backend/alembic.ini

@@ -0,0 +1,38 @@
+[alembic]
+script_location = alembic
+prepend_sys_path = .
+path_separator = os
+
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

backend/alembic/env.py

@@ -0,0 +1,46 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config, pool
+
+from alembic import context
+from app.core.config import get_settings
+from app.models import Base
+
+config = context.config
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+settings = get_settings()
+config.set_main_option("sqlalchemy.url", settings.database_url)
+
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

backend/alembic/script.py.mako

@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

backend/alembic/versions/0a4c1d2e3f5b_idempotency_request_fingerprint.py

@@ -0,0 +1,28 @@
+"""idempotency request fingerprint
+
+Revision ID: 0a4c1d2e3f5b
+Revises: c24f6a9d013e
+Create Date: 2026-08-16 22:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = "0a4c1d2e3f5b"
+down_revision: Union[str, None] = "c24f6a9d013e"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "idempotency_records",
+        sa.Column("request_fingerprint", sa.String(length=64), nullable=True),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("idempotency_records", "request_fingerprint")

backend/alembic/versions/4f2b9c8d7e61_unique_open_quality_condition.py

@@ -0,0 +1,27 @@
+"""enforce one open issue per detected condition
+
+Revision ID: 4f2b9c8d7e61
+Revises: 0a4c1d2e3f5b
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "4f2b9c8d7e61"
+down_revision = "0a4c1d2e3f5b"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_index(
+        "uq_data_quality_one_open_condition",
+        "data_quality_issues",
+        ["rule_type", "entity_type", "entity_id"],
+        unique=True,
+        postgresql_where=sa.text("status = 'open'"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("uq_data_quality_one_open_condition", table_name="data_quality_issues")

backend/alembic/versions/799d8800e241_outbox_last_error_code.py

@@ -0,0 +1,25 @@
+"""outbox last_error_code
+
+Revision ID: 799d8800e241
+Revises: e7b08389f47f
+Create Date: 2026-08-03 10:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = '799d8800e241'
+down_revision: Union[str, None] = 'e7b08389f47f'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('outbox_events', sa.Column('last_error_code', sa.String(length=60), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column('outbox_events', 'last_error_code')

backend/alembic/versions/a81d0ce9f662_oidc_identity.py

@@ -0,0 +1,28 @@
+"""add optional external OIDC identity
+
+Revision ID: a81d0ce9f662
+Revises: f43d829ab610
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "a81d0ce9f662"
+down_revision = "f43d829ab610"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column("users", sa.Column("identity_provider", sa.String(80), nullable=True))
+    op.add_column("users", sa.Column("external_subject", sa.String(255), nullable=True))
+    op.create_unique_constraint(
+        "uq_user_external_identity", "users", ["identity_provider", "external_subject"]
+    )
+
+
+def downgrade() -> None:
+    op.drop_constraint("uq_user_external_identity", "users", type_="unique")
+    op.drop_column("users", "external_subject")
+    op.drop_column("users", "identity_provider")

backend/alembic/versions/b7c7b536df85_operational_user_credentials.py

@@ -0,0 +1,25 @@
+"""operational user credentials
+
+Revision ID: b7c7b536df85
+Revises: 799d8800e241
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "b7c7b536df85"
+down_revision = "799d8800e241"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column("users", sa.Column("email", sa.String(length=320), nullable=True))
+    op.add_column("users", sa.Column("password_hash", sa.String(length=512), nullable=True))
+    op.create_unique_constraint("uq_users_email", "users", ["email"])
+
+
+def downgrade() -> None:
+    op.drop_constraint("uq_users_email", "users", type_="unique")
+    op.drop_column("users", "password_hash")
+    op.drop_column("users", "email")

backend/alembic/versions/b913a72e8c14_customer_privacy_state.py

@@ -0,0 +1,24 @@
+"""add explicit customer anonymisation state
+
+Revision ID: b913a72e8c14
+Revises: a81d0ce9f662
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "b913a72e8c14"
+down_revision = "a81d0ce9f662"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column("customers", sa.Column("anonymized_at", sa.DateTime(timezone=True)))
+    op.create_index("ix_customers_anonymized_at", "customers", ["anonymized_at"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_customers_anonymized_at", table_name="customers")
+    op.drop_column("customers", "anonymized_at")

backend/alembic/versions/c24f6a9d013e_domain_constraints_indexes.py

@@ -0,0 +1,68 @@
+"""add domain constraints and operational indexes
+
+Revision ID: c24f6a9d013e
+Revises: b913a72e8c14
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "c24f6a9d013e"
+down_revision = "b913a72e8c14"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    checks = (
+        ("bookings", "ck_bookings_status", "status IN ('reserved','active','returned','cancelled','blocked')"),
+        ("bookings", "ck_bookings_time_window", "ends_at > starts_at"),
+        ("bookings", "ck_bookings_start_odometer", "start_odometer_km IS NULL OR start_odometer_km >= 0"),
+        ("bookings", "ck_bookings_end_odometer", "end_odometer_km IS NULL OR end_odometer_km >= 0"),
+        ("vehicles", "ck_vehicles_operational_status", "operational_status IN ('available','rented','cleaning','maintenance','blocked')"),
+        ("vehicles", "ck_vehicles_model_year", "model_year BETWEEN 1900 AND 2100"),
+        ("vehicles", "ck_vehicles_odometer", "odometer_km >= 0"),
+        ("vehicles", "ck_vehicles_next_service", "next_service_km >= 0"),
+        ("vehicles", "ck_vehicles_version", "version >= 1"),
+        ("data_quality_issues", "ck_data_quality_rule_type", "rule_type IN ('possible_duplicate_customer','missing_required_field','odometer_regression','booking_overlap','vehicle_status_conflict')"),
+        ("data_quality_issues", "ck_data_quality_severity", "severity IN ('low','medium','high')"),
+        ("data_quality_issues", "ck_data_quality_status", "status IN ('open','deferred','resolved','rejected')"),
+        ("outbox_events", "ck_outbox_delivery_status", "delivery_status IN ('pending','delivering','succeeded','failed')"),
+        ("outbox_events", "ck_outbox_attempts", "attempts >= 0"),
+        ("audit_events", "ck_audit_actor_type", "actor_type IN ('user','service','system')"),
+    )
+    for table, name, condition in checks:
+        op.create_check_constraint(name, table, condition)
+
+    op.create_index("ix_bookings_vehicle_status_window", "bookings", ["vehicle_id", "status", "starts_at", "ends_at"])
+    op.create_index("ix_data_quality_work_queue", "data_quality_issues", ["status", "due_at", "severity"])
+    op.create_index("ix_outbox_delivery_next_attempt", "outbox_events", ["delivery_status", "next_attempt_at"])
+    op.create_index("ix_audit_action_occurred", "audit_events", ["action", "occurred_at"])
+    op.create_index("ix_audit_entity", "audit_events", ["entity_type", "entity_id"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_audit_entity", table_name="audit_events")
+    op.drop_index("ix_audit_action_occurred", table_name="audit_events")
+    op.drop_index("ix_outbox_delivery_next_attempt", table_name="outbox_events")
+    op.drop_index("ix_data_quality_work_queue", table_name="data_quality_issues")
+    op.drop_index("ix_bookings_vehicle_status_window", table_name="bookings")
+    for table, name in (
+        ("audit_events", "ck_audit_actor_type"),
+        ("outbox_events", "ck_outbox_attempts"),
+        ("outbox_events", "ck_outbox_delivery_status"),
+        ("data_quality_issues", "ck_data_quality_status"),
+        ("data_quality_issues", "ck_data_quality_severity"),
+        ("data_quality_issues", "ck_data_quality_rule_type"),
+        ("vehicles", "ck_vehicles_version"),
+        ("vehicles", "ck_vehicles_next_service"),
+        ("vehicles", "ck_vehicles_odometer"),
+        ("vehicles", "ck_vehicles_model_year"),
+        ("vehicles", "ck_vehicles_operational_status"),
+        ("bookings", "ck_bookings_end_odometer"),
+        ("bookings", "ck_bookings_start_odometer"),
+        ("bookings", "ck_bookings_time_window"),
+        ("bookings", "ck_bookings_status"),
+    ):
+        op.drop_constraint(name, table, type_="check")

backend/alembic/versions/c9498525abb5_initial_schema.py

@@ -0,0 +1,184 @@
+"""initial schema
+
+Revision ID: c9498525abb5
+Revises: 
+Create Date: 2026-08-01 20:50:05.997864
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = 'c9498525abb5'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('audit_events',
+    sa.Column('actor_type', sa.String(length=20), nullable=False),
+    sa.Column('actor_id', sa.UUID(), nullable=True),
+    sa.Column('actor_label', sa.String(length=120), nullable=False),
+    sa.Column('action', sa.String(length=80), nullable=False),
+    sa.Column('entity_type', sa.String(length=30), nullable=False),
+    sa.Column('entity_id', sa.UUID(), nullable=True),
+    sa.Column('correlation_id', sa.UUID(), nullable=False),
+    sa.Column('before_json', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+    sa.Column('after_json', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+    sa.Column('metadata_json', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+    sa.Column('occurred_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('customers',
+    sa.Column('public_ref', sa.String(length=20), nullable=False),
+    sa.Column('first_name', sa.String(length=80), nullable=False),
+    sa.Column('last_name', sa.String(length=80), nullable=False),
+    sa.Column('email', sa.String(length=200), nullable=True),
+    sa.Column('phone', sa.String(length=40), nullable=True),
+    sa.Column('postal_code', sa.String(length=20), nullable=True),
+    sa.Column('city', sa.String(length=120), nullable=True),
+    sa.Column('date_of_birth', sa.Date(), nullable=True),
+    sa.Column('merged_into_customer_id', sa.UUID(), nullable=True),
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.ForeignKeyConstraint(['merged_into_customer_id'], ['customers.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('public_ref')
+    )
+    op.create_table('data_quality_issues',
+    sa.Column('public_ref', sa.String(length=20), nullable=False),
+    sa.Column('rule_type', sa.String(length=40), nullable=False),
+    sa.Column('entity_type', sa.String(length=30), nullable=False),
+    sa.Column('entity_id', sa.UUID(), nullable=False),
+    sa.Column('severity', sa.String(length=10), nullable=False),
+    sa.Column('status', sa.String(length=20), nullable=False),
+    sa.Column('evidence_json', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+    sa.Column('proposed_action_json', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+    sa.Column('detected_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('resolved_at', sa.DateTime(timezone=True), nullable=True),
+    sa.Column('resolved_by', sa.String(length=120), nullable=True),
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('public_ref')
+    )
+    op.create_table('outbox_events',
+    sa.Column('event_id', sa.UUID(), nullable=False),
+    sa.Column('event_type', sa.String(length=60), nullable=False),
+    sa.Column('aggregate_type', sa.String(length=30), nullable=False),
+    sa.Column('aggregate_id', sa.UUID(), nullable=False),
+    sa.Column('payload_json', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+    sa.Column('occurred_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('delivery_status', sa.String(length=20), nullable=False),
+    sa.Column('attempts', sa.Integer(), nullable=False),
+    sa.Column('next_attempt_at', sa.DateTime(timezone=True), nullable=True),
+    sa.Column('last_error', sa.Text(), nullable=True),
+    sa.Column('external_run_id', sa.String(length=120), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.PrimaryKeyConstraint('event_id')
+    )
+    op.create_table('users',
+    sa.Column('public_ref', sa.String(length=20), nullable=False),
+    sa.Column('display_name', sa.String(length=120), nullable=False),
+    sa.Column('role', sa.String(length=30), nullable=False),
+    sa.Column('active', sa.Boolean(), nullable=False),
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('public_ref')
+    )
+    op.create_table('vehicles',
+    sa.Column('public_ref', sa.String(length=20), nullable=False),
+    sa.Column('make', sa.String(length=80), nullable=False),
+    sa.Column('model', sa.String(length=80), nullable=False),
+    sa.Column('model_year', sa.Integer(), nullable=False),
+    sa.Column('registration_number', sa.String(length=40), nullable=False),
+    sa.Column('location', sa.String(length=120), nullable=False),
+    sa.Column('operational_status', sa.String(length=20), nullable=False),
+    sa.Column('odometer_km', sa.Integer(), nullable=False),
+    sa.Column('next_service_km', sa.Integer(), nullable=False),
+    sa.Column('active', sa.Boolean(), nullable=False),
+    sa.Column('version', sa.Integer(), nullable=False),
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('public_ref'),
+    sa.UniqueConstraint('registration_number')
+    )
+    op.create_table('bookings',
+    sa.Column('public_ref', sa.String(length=20), nullable=False),
+    sa.Column('customer_id', sa.UUID(), nullable=False),
+    sa.Column('vehicle_id', sa.UUID(), nullable=False),
+    sa.Column('starts_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('ends_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('status', sa.String(length=20), nullable=False),
+    sa.Column('start_odometer_km', sa.Integer(), nullable=True),
+    sa.Column('end_odometer_km', sa.Integer(), nullable=True),
+    sa.Column('requirements_complete', sa.Boolean(), nullable=False),
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.ForeignKeyConstraint(['customer_id'], ['customers.id'], ),
+    sa.ForeignKeyConstraint(['vehicle_id'], ['vehicles.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('public_ref')
+    )
+    op.create_table('maintenance_records',
+    sa.Column('public_ref', sa.String(length=20), nullable=False),
+    sa.Column('vehicle_id', sa.UUID(), nullable=False),
+    sa.Column('occurred_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('odometer_km', sa.Integer(), nullable=False),
+    sa.Column('category', sa.String(length=60), nullable=False),
+    sa.Column('summary', sa.Text(), nullable=False),
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.ForeignKeyConstraint(['vehicle_id'], ['vehicles.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('public_ref')
+    )
+    op.create_table('inspections',
+    sa.Column('public_ref', sa.String(length=20), nullable=False),
+    sa.Column('booking_id', sa.UUID(), nullable=False),
+    sa.Column('vehicle_id', sa.UUID(), nullable=False),
+    sa.Column('type', sa.String(length=20), nullable=False),
+    sa.Column('fuel_level_percent', sa.Integer(), nullable=False),
+    sa.Column('cleanliness_ok', sa.Boolean(), nullable=False),
+    sa.Column('damage_reported', sa.Boolean(), nullable=False),
+    sa.Column('technical_warning', sa.Boolean(), nullable=False),
+    sa.Column('notes', sa.Text(), nullable=True),
+    sa.Column('odometer_km', sa.Integer(), nullable=False),
+    sa.Column('completed_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('completed_by', sa.String(length=120), nullable=True),
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.ForeignKeyConstraint(['booking_id'], ['bookings.id'], ),
+    sa.ForeignKeyConstraint(['vehicle_id'], ['vehicles.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('public_ref')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('inspections')
+    op.drop_table('maintenance_records')
+    op.drop_table('bookings')
+    op.drop_table('vehicles')
+    op.drop_table('users')
+    op.drop_table('outbox_events')
+    op.drop_table('data_quality_issues')
+    op.drop_table('customers')
+    op.drop_table('audit_events')
+    # ### end Alembic commands ###

backend/alembic/versions/d1f83bc64170_revoked_sessions.py

@@ -0,0 +1,49 @@
+"""persist revoked sessions
+
+Revision ID: d1f83bc64170
+Revises: b7c7b536df85
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "d1f83bc64170"
+down_revision = "b7c7b536df85"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "revoked_sessions",
+        sa.Column("token_hash", sa.String(length=64), nullable=False),
+        sa.Column("expires_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("id", sa.Uuid(), nullable=False),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.text("now()"),
+            nullable=False,
+        ),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.text("now()"),
+            nullable=False,
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index("ix_revoked_sessions_expires_at", "revoked_sessions", ["expires_at"])
+    op.create_index(
+        "ix_revoked_sessions_token_hash",
+        "revoked_sessions",
+        ["token_hash"],
+        unique=True,
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_revoked_sessions_token_hash", table_name="revoked_sessions")
+    op.drop_index("ix_revoked_sessions_expires_at", table_name="revoked_sessions")
+    op.drop_table("revoked_sessions")

backend/alembic/versions/e7b08389f47f_idempotency_records.py

@@ -0,0 +1,41 @@
+"""idempotency records
+
+Revision ID: e7b08389f47f
+Revises: c9498525abb5
+Create Date: 2026-08-01 21:24:35.472070
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = 'e7b08389f47f'
+down_revision: Union[str, None] = 'c9498525abb5'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('idempotency_records',
+    sa.Column('idempotency_key', sa.String(length=128), nullable=False),
+    sa.Column('booking_id', sa.UUID(), nullable=False),
+    sa.Column('response_status', sa.Integer(), nullable=False),
+    sa.Column('response_body', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.ForeignKeyConstraint(['booking_id'], ['bookings.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('idempotency_key')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('idempotency_records')
+    # ### end Alembic commands ###

backend/alembic/versions/f43d829ab610_quality_work_queue.py

@@ -0,0 +1,65 @@
+"""add ownership and SLA deadlines to data quality issues
+
+Revision ID: f43d829ab610
+Revises: d1f83bc64170
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "f43d829ab610"
+down_revision = "d1f83bc64170"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "data_quality_issues",
+        sa.Column("due_at", sa.DateTime(timezone=True), nullable=True),
+    )
+    op.add_column(
+        "data_quality_issues",
+        sa.Column("assigned_to_user_id", sa.Uuid(), nullable=True),
+    )
+    op.create_foreign_key(
+        "fk_data_quality_issues_assigned_user",
+        "data_quality_issues",
+        "users",
+        ["assigned_to_user_id"],
+        ["id"],
+        ondelete="SET NULL",
+    )
+    op.create_index("ix_data_quality_issues_due_at", "data_quality_issues", ["due_at"])
+    op.create_index(
+        "ix_data_quality_issues_assigned_to_user_id",
+        "data_quality_issues",
+        ["assigned_to_user_id"],
+    )
+    op.execute(
+        """
+        UPDATE data_quality_issues
+        SET due_at = detected_at + CASE severity
+          WHEN 'high' THEN interval '4 hours'
+          WHEN 'low' THEN interval '3 days'
+          ELSE interval '1 day'
+        END
+        WHERE status = 'open' AND due_at IS NULL
+        """
+    )
+
+
+def downgrade() -> None:
+    op.drop_index(
+        "ix_data_quality_issues_assigned_to_user_id",
+        table_name="data_quality_issues",
+    )
+    op.drop_index("ix_data_quality_issues_due_at", table_name="data_quality_issues")
+    op.drop_constraint(
+        "fk_data_quality_issues_assigned_user",
+        "data_quality_issues",
+        type_="foreignkey",
+    )
+    op.drop_column("data_quality_issues", "assigned_to_user_id")
+    op.drop_column("data_quality_issues", "due_at")

backend/app/api/deps.py

@@ -0,0 +1,94 @@
+from __future__ import annotations
+
+import hmac
+import re
+from collections.abc import Generator
+from dataclasses import dataclass
+
+from fastapi import Depends, Header, HTTPException, Request, status
+from sqlalchemy.orm import Session
+
+from app.core.config import get_settings
+from app.core.db import SessionLocal
+from app.core.security import SessionPayload, read_session_token
+from app.models.user import User
+from app.schemas import CurrentUser, Role
+from app.services.sessions import is_session_revoked
+
+settings = get_settings()
+_VALID_ROLES = frozenset(Role.__args__)  # type: ignore[attr-defined]
+
+
+def get_db() -> Generator[Session, None, None]:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def get_current_user(request: Request, db: Session = Depends(get_db)) -> CurrentUser:
+    token = request.cookies.get(settings.session_cookie_name)
+    payload: SessionPayload | None = read_session_token(token) if token else None
+    revoked = token is not None and is_session_revoked(db, token)
+    if payload is None or payload.role not in _VALID_ROLES or revoked:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Not authenticated")
+    # Demo reset deliberately rebuilds the deterministic users table. Retaining the
+    # signed demo session until the reset endpoint clears its cookie keeps existing demo
+    # workflows stable; operational sessions are always checked against the live record.
+    if settings.mobilityops_demo_mode:
+        demo_role: Role = payload.role  # type: ignore[assignment]
+        return CurrentUser(
+            public_ref=payload.public_ref,
+            display_name=payload.display_name,
+            role=demo_role,
+        )
+    user = db.get(User, payload.user_id)
+    if (
+        user is None
+        or not user.active
+        or user.public_ref != payload.public_ref
+        or user.role not in _VALID_ROLES
+    ):
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Not authenticated")
+    role: Role = user.role  # type: ignore[assignment]
+    return CurrentUser(public_ref=user.public_ref, display_name=user.display_name, role=role)
+
+
+def require_operations_manager(
+    user: CurrentUser = Depends(get_current_user),
+) -> CurrentUser:
+    if user.role != "operations_manager":
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN, detail="Operations Manager role required"
+        )
+    return user
+
+
+@dataclass(frozen=True)
+class McpClientContext:
+    reported_client_id: str
+    tenant: str
+
+
+_MCP_CLIENT_ID = re.compile(
+    r"^itworx-mcp-hub:(?:readiness|mobilityops:[A-Za-z0-9][A-Za-z0-9._:-]{0,127})$"
+)
+
+
+def require_mcp_service_token(
+    x_service_token: str = Header(..., alias="X-Service-Token"),
+    x_client_id: str = Header(..., alias="X-Client-Id", min_length=1, max_length=180),
+    x_tenant_id: str | None = Header(default=None, alias="X-Tenant-Id", max_length=120),
+) -> McpClientContext:
+    if not hmac.compare_digest(x_service_token, settings.mcp_hub_service_token):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid service token"
+        )
+    if not _MCP_CLIENT_ID.fullmatch(x_client_id):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN, detail="Untrusted MCP client identity"
+        )
+    if x_tenant_id is not None and x_tenant_id != settings.ragcore_tenant:
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Tenant mismatch")
+    return McpClientContext(reported_client_id=x_client_id, tenant=settings.ragcore_tenant)

backend/app/api/routers/audit.py

@@ -0,0 +1,214 @@
+from __future__ import annotations
+
+import csv
+import io
+import json
+import uuid
+from collections.abc import Sequence
+from datetime import UTC, datetime, timedelta
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi.responses import Response
+from sqlalchemy import func, select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_db, require_operations_manager
+from app.core.config import get_settings
+from app.models.audit import AuditEvent
+from app.models.booking import Booking
+from app.models.customer import Customer
+from app.models.data_quality import DataQualityIssue
+from app.models.vehicle import Vehicle
+from app.schemas import AuditEventOut, AuditEventPageOut, CurrentUser
+from app.services.audit import record_audit_event
+
+router = APIRouter(prefix="/api/v1/audit", tags=["audit"])
+settings = get_settings()
+
+# Only entity types with a stable public reference and (optionally) a real frontend route
+# are resolved here. Types like "system", "knowledge" or "mcp_tool" carry no linkable
+# entity_id and are left as plain labels.
+_ENTITY_MODELS: dict[str, Any] = {
+    "vehicle": Vehicle,
+    "booking": Booking,
+    "customer": Customer,
+    "data_quality_issue": DataQualityIssue,
+}
+_ROUTE_TEMPLATES: dict[str, str] = {
+    "vehicle": "/vehicles/{ref}",
+    "booking": "/bookings/{ref}",
+    "data_quality_issue": "/data-quality/{ref}",
+    # No customer detail route exists in this proof of concept; still resolve the
+    # reference for display, just without a link.
+}
+
+
+def _as_utc(value: datetime | None) -> datetime | None:
+    """Treat naive query datetimes as UTC so they compare safely with aware values."""
+    if value is None:
+        return None
+    return value if value.tzinfo is not None else value.replace(tzinfo=UTC)
+
+
+@router.get("/export.csv")
+def export_audit_csv(
+    occurred_from: datetime | None = Query(default=None),
+    occurred_to: datetime | None = Query(default=None),
+    db: Session = Depends(get_db),
+    actor: CurrentUser = Depends(require_operations_manager),
+) -> Response:
+    end = _as_utc(occurred_to) or datetime.now(UTC)
+    start = _as_utc(occurred_from) or end - timedelta(days=30)
+    if end <= start or end - start > timedelta(days=90):
+        raise HTTPException(status_code=422, detail="Audit export range must be 1 to 90 days")
+    events = db.scalars(
+        select(AuditEvent)
+        .where(AuditEvent.occurred_at >= start, AuditEvent.occurred_at <= end)
+        .order_by(AuditEvent.occurred_at)
+        .limit(settings.privacy_audit_export_max_rows + 1)
+    ).all()
+    if len(events) > settings.privacy_audit_export_max_rows:
+        raise HTTPException(status_code=413, detail="Audit export exceeds configured row limit")
+    output = io.StringIO(newline="")
+    writer = csv.writer(output)
+    writer.writerow(
+        (
+            "id",
+            "occurred_at",
+            "actor_type",
+            "actor_label",
+            "action",
+            "entity_type",
+            "entity_id",
+            "correlation_id",
+            "before",
+            "after",
+            "metadata",
+        )
+    )
+    for event in events:
+        writer.writerow(
+            (
+                event.id,
+                event.occurred_at.isoformat(),
+                event.actor_type,
+                event.actor_label,
+                event.action,
+                event.entity_type,
+                event.entity_id or "",
+                event.correlation_id,
+                json.dumps(event.before_json, separators=(",", ":"), default=str),
+                json.dumps(event.after_json, separators=(",", ":"), default=str),
+                json.dumps(event.metadata_json, separators=(",", ":"), default=str),
+            )
+        )
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="audit_exported",
+        entity_type="audit",
+        metadata={"from": start.isoformat(), "to": end.isoformat(), "rows": len(events)},
+    )
+    db.commit()
+    return Response(
+        output.getvalue(),
+        media_type="text/csv; charset=utf-8",
+        headers={"Content-Disposition": 'attachment; filename="mobilityops-audit.csv"'},
+    )
+
+
+def _resolve_entity_refs(db: Session, events: Sequence[AuditEvent]) -> dict[uuid.UUID, str]:
+    ids_by_type: dict[str, set[uuid.UUID]] = {}
+    for event in events:
+        if event.entity_id is not None and event.entity_type in _ENTITY_MODELS:
+            ids_by_type.setdefault(event.entity_type, set()).add(event.entity_id)
+
+    refs: dict[uuid.UUID, str] = {}
+    for entity_type, ids in ids_by_type.items():
+        model = _ENTITY_MODELS[entity_type]
+        rows: Sequence[Any] = db.scalars(select(model).where(model.id.in_(ids))).all()
+        for row in rows:
+            refs[row.id] = row.public_ref
+    return refs
+
+
+@router.get("", response_model=list[AuditEventOut] | AuditEventPageOut)
+def list_audit_events(
+    actor_label: str | None = Query(default=None),
+    action: str | None = Query(default=None),
+    entity_type: str | None = Query(default=None),
+    entity_ref: str | None = Query(default=None, min_length=1, max_length=100),
+    correlation_id: uuid.UUID | None = Query(default=None),
+    occurred_from: datetime | None = Query(default=None),
+    occurred_to: datetime | None = Query(default=None),
+    page: int | None = Query(default=None, ge=1),
+    page_size: int = Query(default=25, ge=1, le=25),
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(require_operations_manager),
+) -> list[AuditEventOut] | AuditEventPageOut:
+    stmt = select(AuditEvent).order_by(AuditEvent.occurred_at.desc())
+    if actor_label:
+        stmt = stmt.where(AuditEvent.actor_label == actor_label)
+    if action:
+        stmt = stmt.where(AuditEvent.action == action)
+    if entity_type:
+        stmt = stmt.where(AuditEvent.entity_type == entity_type)
+    if entity_ref:
+        matched_ids: set[uuid.UUID] = set()
+        for model in _ENTITY_MODELS.values():
+            matched_ids.update(
+                db.scalars(
+                    select(model.id).where(model.public_ref.ilike(f"%{entity_ref.strip()}%"))
+                ).all()
+            )
+        if not matched_ids:
+            if page is None:
+                return []
+            return AuditEventPageOut(items=[], page=1, page_size=page_size, total=0, total_pages=1)
+        stmt = stmt.where(AuditEvent.entity_id.in_(matched_ids))
+    if correlation_id:
+        stmt = stmt.where(AuditEvent.correlation_id == correlation_id)
+    if occurred_from:
+        stmt = stmt.where(AuditEvent.occurred_at >= occurred_from)
+    if occurred_to:
+        stmt = stmt.where(AuditEvent.occurred_at <= occurred_to)
+    total = db.scalar(select(func.count()).select_from(stmt.subquery())) or 0
+    page_number = page or 1
+    events = db.scalars(
+        stmt if page is None else stmt.offset((page_number - 1) * page_size).limit(page_size)
+    ).all()
+    entity_refs = _resolve_entity_refs(db, events)
+
+    out = []
+    for e in events:
+        ref = entity_refs.get(e.entity_id) if e.entity_id else None
+        route = _ROUTE_TEMPLATES.get(e.entity_type)
+        out.append(
+            AuditEventOut(
+                id=str(e.id),
+                actor_type=e.actor_type,
+                actor_label=e.actor_label,
+                action=e.action,
+                entity_type=e.entity_type,
+                entity_id=str(e.entity_id) if e.entity_id else None,
+                entity_ref=ref,
+                entity_link=route.format(ref=ref) if route and ref else None,
+                correlation_id=str(e.correlation_id),
+                occurred_at=e.occurred_at,
+                before=e.before_json,
+                after=e.after_json,
+                metadata=e.metadata_json,
+            )
+        )
+    if page is None:
+        return out
+    total_pages = max(1, (total + page_size - 1) // page_size)
+    return AuditEventPageOut(
+        items=out,
+        page=min(page_number, total_pages),
+        page_size=page_size,
+        total=total,
+        total_pages=total_pages,
+    )

backend/app/api/routers/auth.py

@@ -0,0 +1,312 @@
+from __future__ import annotations
+
+import time
+import uuid
+
+from authlib.integrations.starlette_client import OAuth, OAuthError  # type: ignore[import-untyped]
+from fastapi import APIRouter, Depends, HTTPException, Request, Response, status
+from fastapi.responses import RedirectResponse
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user, get_db
+from app.core.config import get_settings
+from app.core.ratelimit import FailedAttemptLimiter
+from app.core.security import (
+    SessionPayload,
+    create_session_token,
+    hash_password,
+    read_session_token,
+    verify_password,
+)
+from app.models.user import User
+from app.schemas import CurrentUser, OidcStatusOut, PasswordLoginRequest
+from app.services.audit import record_audit_event
+from app.services.sessions import revoke_session
+
+router = APIRouter(prefix="/api/v1/auth", tags=["auth"])
+settings = get_settings()
+_login_limiter = (
+    FailedAttemptLimiter(
+        max_failures=settings.login_max_failures,
+        window_seconds=settings.login_failure_window_seconds,
+    )
+    if settings.login_max_failures > 0
+    else None
+)
+
+
+def _client_key(request: Request) -> str:
+    # The API sits behind the web container's reverse proxy in every documented
+    # deployment. The proxy appends/overwrites the socket peer as the final hop, so an
+    # attacker-controlled leading value must never select a fresh limiter bucket.
+    forwarded = request.headers.get("x-forwarded-for", "")
+    if forwarded:
+        return forwarded.split(",")[-1].strip()
+    return request.client.host if request.client else "unknown"
+
+
+oauth = OAuth()
+if settings.oidc_enabled and settings.oidc_issuer_url:
+    oauth.register(
+        name="oidc",
+        client_id=settings.oidc_client_id,
+        client_secret=settings.oidc_client_secret,
+        server_metadata_url=f"{settings.oidc_issuer_url.rstrip('/')}/.well-known/openid-configuration",
+        client_kwargs={"scope": "openid email profile"},
+    )
+
+
+def _current_user_out(user: User) -> CurrentUser:
+    return CurrentUser(
+        public_ref=user.public_ref,
+        display_name=user.display_name,
+        role=user.role,  # type: ignore[arg-type]
+    )
+
+
+def _set_session(response: Response, user: User) -> None:
+    token = create_session_token(
+        SessionPayload(
+            user_id=str(user.id),
+            public_ref=user.public_ref,
+            role=user.role,
+            display_name=user.display_name,
+            issued_at=int(time.time()),
+            session_id=str(uuid.uuid4()),
+        )
+    )
+    response.set_cookie(
+        settings.session_cookie_name,
+        token,
+        httponly=True,
+        samesite="lax",
+        secure=settings.session_cookie_secure,
+        max_age=settings.session_ttl_seconds,
+    )
+
+
+def bootstrap_initial_admin(db: Session) -> None:
+    """Create or rotate the explicitly configured first manager in operational mode."""
+    if (
+        settings.mobilityops_demo_mode
+        or not settings.initial_admin_email
+        or not settings.initial_admin_password
+    ):
+        return
+    email = settings.initial_admin_email.strip().lower()
+    user = db.scalar(select(User).where(User.email == email))
+    if user is None:
+        user = User(
+            public_ref="USR-ADMIN",
+            email=email,
+            password_hash=hash_password(settings.initial_admin_password),
+            display_name=settings.initial_admin_display_name,
+            role="operations_manager",
+            active=True,
+        )
+        db.add(user)
+        record_audit_event(
+            db,
+            actor_type="system",
+            actor_label="bootstrap",
+            action="operational_admin_created",
+            entity_type="user",
+            entity_id=user.id,
+        )
+        db.commit()
+
+
+def _oidc_configured() -> bool:
+    return bool(
+        settings.oidc_enabled
+        and settings.oidc_issuer_url
+        and settings.oidc_client_id
+        and settings.oidc_client_secret
+    )
+
+
+def _oidc_redirect_uri() -> str:
+    return settings.oidc_redirect_uri or (
+        f"{settings.mobilityops_public_url.rstrip('/')}/api/v1/auth/oidc/callback"
+    )
+
+
+def _allowed_oidc_email(email: str) -> bool:
+    domains = {
+        value.strip().casefold()
+        for value in settings.oidc_allowed_email_domains.split(",")
+        if value.strip()
+    }
+    return not domains or email.rsplit("@", 1)[-1].casefold() in domains
+
+
+def _resolve_oidc_user(db: Session, claims: dict[str, object]) -> User:
+    subject = str(claims.get("sub") or "").strip()
+    email = str(claims.get("email") or "").strip().lower()
+    if not subject or not email or claims.get("email_verified") is not True:
+        raise HTTPException(status_code=401, detail="Verified OIDC email and subject are required")
+    if not _allowed_oidc_email(email):
+        raise HTTPException(status_code=403, detail="Email domain is not allowed")
+
+    provider = settings.oidc_issuer_url.rstrip("/")
+    user = db.scalar(
+        select(User).where(
+            User.identity_provider == provider,
+            User.external_subject == subject,
+        )
+    )
+    if user is None:
+        user = db.scalar(select(User).where(User.email == email))
+        if user is not None and user.external_subject not in (None, subject):
+            raise HTTPException(status_code=409, detail="Email is linked to another identity")
+        if user is not None and claims.get("email_verified") is not True:
+            # Linking an existing local account (possibly the bootstrap admin) purely on an
+            # email match requires the IdP to explicitly assert the address is verified;
+            # an absent claim is treated as unverified.
+            raise HTTPException(status_code=401, detail="Verified OIDC email is required")
+    created = user is None
+    if created:
+        if not settings.oidc_auto_provision:
+            raise HTTPException(status_code=403, detail="OIDC user is not provisioned")
+        role = settings.oidc_default_role
+        if role not in {"operations_manager", "rental_employee"}:
+            role = "rental_employee"
+        user = User(
+            public_ref=f"USR-{uuid.uuid4().hex[:8].upper()}",
+            email=email,
+            password_hash=None,
+            display_name=str(claims.get("name") or email),
+            role=role,
+            active=True,
+        )
+        db.add(user)
+        db.flush()
+    assert user is not None
+    if not user.active:
+        raise HTTPException(status_code=403, detail="User is inactive")
+    user.identity_provider = provider
+    user.external_subject = subject
+    record_audit_event(
+        db,
+        actor_type="system" if created else "user",
+        actor_id=None if created else user.id,
+        actor_label=settings.oidc_provider_name,
+        action="oidc_user_provisioned" if created else "oidc_identity_linked",
+        entity_type="user",
+        entity_id=user.id,
+        metadata={"provider": provider},
+    )
+    return user
+
+
+@router.get("/oidc/status", response_model=OidcStatusOut)
+def oidc_status() -> OidcStatusOut:
+    return OidcStatusOut(
+        enabled=_oidc_configured(),
+        provider_name=settings.oidc_provider_name if _oidc_configured() else None,
+    )
+
+
+@router.get("/oidc/login")
+async def oidc_login(request: Request) -> Response:
+    if not _oidc_configured():
+        raise HTTPException(status_code=404, detail="OIDC login is not configured")
+    client = oauth.create_client("oidc")
+    if client is None:
+        raise HTTPException(status_code=503, detail="OIDC client is unavailable")
+    return await client.authorize_redirect(request, _oidc_redirect_uri())
+
+
+@router.get("/oidc/callback")
+async def oidc_callback(request: Request, db: Session = Depends(get_db)) -> Response:
+    if not _oidc_configured():
+        raise HTTPException(status_code=404, detail="OIDC login is not configured")
+    client = oauth.create_client("oidc")
+    if client is None:
+        raise HTTPException(status_code=503, detail="OIDC client is unavailable")
+    try:
+        token = await client.authorize_access_token(request)
+    except OAuthError as exc:
+        raise HTTPException(status_code=401, detail="OIDC authentication failed") from exc
+    user = _resolve_oidc_user(db, dict(token.get("userinfo") or {}))
+    response = RedirectResponse(f"{settings.mobilityops_public_url.rstrip('/')}/dashboard")
+    _set_session(response, user)
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_id=user.id,
+        actor_label=user.display_name,
+        action="oidc_login",
+        entity_type="user",
+        entity_id=user.id,
+        metadata={"provider": settings.oidc_issuer_url.rstrip("/")},
+    )
+    db.commit()
+    return response
+
+
+@router.post("/login", response_model=CurrentUser)
+def password_login(
+    body: PasswordLoginRequest,
+    request: Request,
+    response: Response,
+    db: Session = Depends(get_db),
+) -> CurrentUser:
+    if settings.mobilityops_demo_mode:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Password login is unavailable in demo mode",
+        )
+    limiter_key = _client_key(request)
+    retry_after = _login_limiter.retry_after_seconds(limiter_key) if _login_limiter else 0
+    if retry_after:
+        raise HTTPException(
+            status_code=status.HTTP_429_TOO_MANY_REQUESTS,
+            detail="Too many failed login attempts. Try again later.",
+            headers={"Retry-After": str(retry_after)},
+        )
+    user = db.scalar(select(User).where(User.email == body.email.strip().lower()))
+    if user is None or not user.active or not verify_password(body.password, user.password_hash):
+        if _login_limiter:
+            _login_limiter.record_failure(limiter_key)
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid credentials")
+    if _login_limiter:
+        _login_limiter.reset(limiter_key)
+    _set_session(response, user)
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_id=user.id,
+        actor_label=user.display_name,
+        action="password_login",
+        entity_type="user",
+        entity_id=user.id,
+    )
+    db.commit()
+    return _current_user_out(user)
+
+
+@router.get("/session", response_model=CurrentUser)
+def get_session(response: Response, user: CurrentUser = Depends(get_current_user)) -> CurrentUser:
+    response.headers["Cache-Control"] = "no-store"
+    return user
+
+
+@router.post("/logout")
+def logout(request: Request, response: Response, db: Session = Depends(get_db)) -> dict:
+    token = request.cookies.get(settings.session_cookie_name)
+    payload = read_session_token(token) if token else None
+    if payload is not None and token is not None:
+        revoke_session(db, token, payload)
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_id=uuid.UUID(payload.user_id),
+            actor_label=payload.display_name,
+            action="logout",
+            entity_type="user",
+        )
+        db.commit()
+    response.delete_cookie(settings.session_cookie_name)
+    return {"status": "logged_out"}

backend/app/api/routers/bookings.py

@@ -0,0 +1,565 @@
+from __future__ import annotations
+
+import uuid
+from datetime import UTC, datetime
+from typing import Literal
+
+from fastapi import APIRouter, Depends, Header, HTTPException, Query, Response
+from sqlalchemy import case, func, or_, select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user, get_db
+from app.models.booking import Booking
+from app.models.customer import Customer
+from app.models.inspection import Inspection
+from app.models.vehicle import Vehicle
+from app.schemas import (
+    AvailableVehicleOut,
+    BookingOut,
+    BookingPageOut,
+    CancelBookingRequest,
+    CheckoutBookingRequest,
+    CheckoutBookingResult,
+    CompleteBookingRequirementsRequest,
+    CreateBookingRequest,
+    CurrentUser,
+    NextBookingRisk,
+    RegisterReturnRequest,
+    RegisterReturnResult,
+    RescheduleBookingRequest,
+    ReturnPreviewResult,
+)
+from app.services.audit import record_audit_event
+from app.services.data_quality import open_odometer_regression_issue
+from app.services.returns import preview_vehicle_return, register_vehicle_return
+
+router = APIRouter(prefix="/api/v1/bookings", tags=["bookings"])
+
+
+def _to_out(booking: Booking, customer: Customer, vehicle: Vehicle) -> BookingOut:
+    return BookingOut(
+        public_ref=booking.public_ref,
+        customer_ref=customer.public_ref,
+        vehicle_ref=vehicle.public_ref,
+        starts_at=booking.starts_at,
+        ends_at=booking.ends_at,
+        status=booking.status,
+        start_odometer_km=booking.start_odometer_km,
+        end_odometer_km=booking.end_odometer_km,
+        requirements_complete=booking.requirements_complete,
+        customer_name=f"{customer.first_name} {customer.last_name}",
+    )
+
+
+@router.get("", response_model=list[BookingOut] | BookingPageOut)
+def list_bookings(
+    status: str | None = Query(default=None),
+    vehicle_ref: str | None = Query(default=None),
+    query: str | None = Query(default=None, min_length=1, max_length=100),
+    starts_from: datetime | None = Query(default=None),
+    starts_to: datetime | None = Query(default=None),
+    location: str | None = Query(default=None, min_length=1, max_length=120),
+    sort: Literal["operational", "starts_asc", "starts_desc"] = Query(default="operational"),
+    page: int | None = Query(default=None, ge=1),
+    page_size: int = Query(default=25, ge=1, le=25),
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(get_current_user),
+) -> list[BookingOut] | BookingPageOut:
+    stmt = select(Booking)
+    if status:
+        stmt = stmt.where(Booking.status == status)
+    if vehicle_ref:
+        vehicle = db.scalar(select(Vehicle).where(Vehicle.public_ref == vehicle_ref))
+        if vehicle is None:
+            if page is None:
+                return []
+            return BookingPageOut(items=[], page=1, page_size=page_size, total=0, total_pages=1)
+        stmt = stmt.where(Booking.vehicle_id == vehicle.id)
+    if starts_from:
+        stmt = stmt.where(Booking.ends_at >= starts_from)
+    if starts_to:
+        stmt = stmt.where(Booking.starts_at < starts_to)
+    if query or location:
+        stmt = stmt.join(Customer, Booking.customer_id == Customer.id).join(
+            Vehicle, Booking.vehicle_id == Vehicle.id
+        )
+    if location:
+        stmt = stmt.where(Vehicle.location.ilike(location.strip()))
+    if query:
+        term = f"%{query.strip()}%"
+        stmt = stmt.where(
+            or_(
+                Booking.public_ref.ilike(term),
+                Customer.first_name.ilike(term),
+                Customer.last_name.ilike(term),
+                Vehicle.public_ref.ilike(term),
+            )
+        )
+    if sort == "starts_asc":
+        stmt = stmt.order_by(Booking.starts_at.asc())
+    elif sort == "starts_desc":
+        stmt = stmt.order_by(Booking.starts_at.desc())
+    else:
+        now = datetime.now(UTC)
+        operational_bucket = case(
+            (Booking.status == "active", 0),
+            (Booking.starts_at >= now, 1),
+            else_=2,
+        )
+        stmt = stmt.order_by(
+            operational_bucket,
+            case((Booking.starts_at >= now, Booking.starts_at)).asc().nulls_last(),
+            Booking.starts_at.desc(),
+        )
+    total = db.scalar(select(func.count()).select_from(stmt.subquery())) or 0
+    page_number = page or 1
+    bookings = db.scalars(
+        stmt if page is None else stmt.offset((page_number - 1) * page_size).limit(page_size)
+    ).all()
+    customer_ids = {booking.customer_id for booking in bookings}
+    vehicle_ids = {booking.vehicle_id for booking in bookings}
+    customers = {
+        customer.id: customer
+        for customer in db.scalars(select(Customer).where(Customer.id.in_(customer_ids))).all()
+    }
+    vehicles = {
+        vehicle.id: vehicle
+        for vehicle in db.scalars(select(Vehicle).where(Vehicle.id.in_(vehicle_ids))).all()
+    }
+    items = [_to_out(b, customers[b.customer_id], vehicles[b.vehicle_id]) for b in bookings]
+    if page is None:
+        return items
+    total_pages = max(1, (total + page_size - 1) // page_size)
+    return BookingPageOut(
+        items=items,
+        page=min(page_number, total_pages),
+        page_size=page_size,
+        total=total,
+        total_pages=total_pages,
+    )
+
+
+@router.post("", response_model=BookingOut, status_code=201)
+def create_booking(
+    body: CreateBookingRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> BookingOut:
+    if body.ends_at <= body.starts_at:
+        raise HTTPException(status_code=422, detail="Booking end must be after its start")
+    customer = db.scalar(
+        select(Customer).where(Customer.public_ref == body.customer_ref).with_for_update()
+    )
+    if (
+        customer is None
+        or customer.merged_into_customer_id is not None
+        or customer.anonymized_at is not None
+    ):
+        raise HTTPException(status_code=422, detail="Customer is unavailable for booking")
+    # Serialise booking creation per vehicle. The overlap check must run after
+    # acquiring this lock, otherwise two concurrent requests can both pass it.
+    vehicle = db.scalar(
+        select(Vehicle).where(Vehicle.public_ref == body.vehicle_ref).with_for_update()
+    )
+    if (
+        vehicle is None
+        or not vehicle.active
+        or vehicle.operational_status in {"maintenance", "blocked"}
+    ):
+        raise HTTPException(status_code=422, detail="Vehicle is unavailable for booking")
+    overlap = db.scalar(
+        select(Booking.id).where(
+            Booking.vehicle_id == vehicle.id,
+            Booking.status.in_(("reserved", "active")),
+            Booking.starts_at < body.ends_at,
+            Booking.ends_at > body.starts_at,
+        )
+    )
+    if overlap is not None:
+        raise HTTPException(status_code=409, detail="Vehicle already has an overlapping booking")
+    booking = Booking(
+        public_ref=f"BK-{uuid.uuid4().hex[:10].upper()}",
+        customer_id=customer.id,
+        vehicle_id=vehicle.id,
+        starts_at=body.starts_at,
+        ends_at=body.ends_at,
+        status="reserved",
+        start_odometer_km=None,
+        end_odometer_km=None,
+        # Requirements are intentionally confirmed in a separate, audited action.
+        # Never allow booking creation to bypass that operational checkpoint.
+        requirements_complete=False,
+    )
+    db.add(booking)
+    db.flush()
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=user.display_name,
+        action="booking_created",
+        entity_type="booking",
+        entity_id=booking.id,
+        after={"public_ref": booking.public_ref, "vehicle_ref": vehicle.public_ref},
+    )
+    db.commit()
+    return _to_out(booking, customer, vehicle)
+
+
+@router.post("/{public_ref}/checkout", response_model=CheckoutBookingResult)
+def checkout_booking(
+    public_ref: str,
+    body: CheckoutBookingRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> CheckoutBookingResult:
+    booking = db.scalar(select(Booking).where(Booking.public_ref == public_ref).with_for_update())
+    if booking is None:
+        raise HTTPException(status_code=404, detail="Booking not found")
+    if booking.status != "reserved":
+        raise HTTPException(status_code=409, detail="Only a reserved booking can be checked out")
+    if not booking.requirements_complete:
+        raise HTTPException(status_code=409, detail="Booking requirements are incomplete")
+    vehicle = db.scalar(select(Vehicle).where(Vehicle.id == booking.vehicle_id).with_for_update())
+    if vehicle is None:
+        raise HTTPException(status_code=500, detail="Booking references a missing vehicle")
+    if not vehicle.active or vehicle.operational_status in {"maintenance", "blocked", "rented"}:
+        raise HTTPException(status_code=409, detail="Vehicle is not ready for checkout")
+    active_conflict = db.scalar(
+        select(Booking.id).where(
+            Booking.vehicle_id == vehicle.id,
+            Booking.status == "active",
+            Booking.id != booking.id,
+        )
+    )
+    if active_conflict is not None:
+        raise HTTPException(status_code=409, detail="Vehicle already has an active booking")
+
+    correlation_id = uuid.uuid4()
+    before_booking = {
+        "status": booking.status,
+        "start_odometer_km": booking.start_odometer_km,
+    }
+    before_vehicle = {
+        "operational_status": vehicle.operational_status,
+        "odometer_km": vehicle.odometer_km,
+    }
+    attention_reasons: list[str] = []
+    if body.start_odometer_km < vehicle.odometer_km:
+        attention_reasons.append("odometer_regression")
+    if not body.cleanliness_ok:
+        attention_reasons.append("cleanliness")
+    if body.damage_reported:
+        attention_reasons.append("damage")
+    if body.technical_warning:
+        attention_reasons.append("technical_warning")
+
+    inspection = Inspection(
+        public_ref=f"INSP-{uuid.uuid4().hex[:10].upper()}",
+        booking_id=booking.id,
+        vehicle_id=vehicle.id,
+        type="checkout",
+        fuel_level_percent=body.fuel_level_percent,
+        cleanliness_ok=body.cleanliness_ok,
+        damage_reported=body.damage_reported,
+        technical_warning=body.technical_warning,
+        notes=body.notes,
+        odometer_km=body.start_odometer_km,
+        completed_at=datetime.now(UTC),
+        completed_by=user.display_name,
+    )
+    db.add(inspection)
+    if "odometer_regression" in attention_reasons:
+        open_odometer_regression_issue(
+            db,
+            vehicle=vehicle,
+            reading_ref=inspection.public_ref,
+            reading_km=body.start_odometer_km,
+            canonical_km=vehicle.odometer_km,
+            source_type="checkout",
+            related_refs=[booking.public_ref, inspection.public_ref],
+            actor_label=user.display_name,
+            correlation_id=correlation_id,
+        )
+    if attention_reasons:
+        booking.status = "blocked"
+        vehicle.operational_status = (
+            "maintenance" if body.damage_reported or body.technical_warning else "cleaning"
+        )
+    else:
+        booking.status = "active"
+        booking.start_odometer_km = body.start_odometer_km
+        vehicle.odometer_km = max(vehicle.odometer_km, body.start_odometer_km)
+        vehicle.operational_status = "rented"
+    vehicle.version += 1
+    db.flush()
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=user.display_name,
+        action="booking_checkout_recorded",
+        entity_type="booking",
+        entity_id=booking.id,
+        correlation_id=correlation_id,
+        before=before_booking,
+        after={
+            "inspection_ref": inspection.public_ref,
+            "booking_status": booking.status,
+            "start_odometer_km": booking.start_odometer_km,
+            "vehicle_status": vehicle.operational_status,
+            "attention_reasons": attention_reasons,
+        },
+    )
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=user.display_name,
+        action="vehicle_status_changed",
+        entity_type="vehicle",
+        entity_id=vehicle.id,
+        correlation_id=correlation_id,
+        before=before_vehicle,
+        after={
+            "operational_status": vehicle.operational_status,
+            "odometer_km": vehicle.odometer_km,
+        },
+        metadata={"booking_ref": booking.public_ref, "inspection_ref": inspection.public_ref},
+    )
+    db.commit()
+    return CheckoutBookingResult(
+        booking_ref=booking.public_ref,
+        vehicle_ref=vehicle.public_ref,
+        inspection_ref=inspection.public_ref,
+        booking_status=booking.status,
+        resulting_vehicle_status=vehicle.operational_status,
+        activated=booking.status == "active",
+        attention_reasons=attention_reasons,
+    )
+
+
+@router.get("/availability", response_model=list[AvailableVehicleOut])
+def list_available_vehicles(
+    starts_at: datetime,
+    ends_at: datetime,
+    query: str | None = Query(default=None, max_length=100),
+    limit: int = Query(default=25, ge=1, le=50),
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(get_current_user),
+) -> list[AvailableVehicleOut]:
+    if ends_at <= starts_at:
+        raise HTTPException(status_code=422, detail="Booking end must be after its start")
+    overlapping_vehicle_ids = select(Booking.vehicle_id).where(
+        Booking.status.in_(("reserved", "active")),
+        Booking.starts_at < ends_at,
+        Booking.ends_at > starts_at,
+    )
+    stmt = (
+        select(Vehicle)
+        .where(
+            Vehicle.active.is_(True),
+            Vehicle.operational_status.not_in(("maintenance", "blocked")),
+            Vehicle.id.not_in(overlapping_vehicle_ids),
+        )
+        .order_by(Vehicle.location, Vehicle.public_ref)
+        .limit(limit)
+    )
+    if query and query.strip():
+        term = f"%{query.strip()}%"
+        stmt = stmt.where(
+            or_(
+                Vehicle.public_ref.ilike(term),
+                Vehicle.make.ilike(term),
+                Vehicle.model.ilike(term),
+                Vehicle.registration_number.ilike(term),
+                Vehicle.location.ilike(term),
+            )
+        )
+    return [
+        AvailableVehicleOut(
+            public_ref=vehicle.public_ref,
+            make=vehicle.make,
+            model=vehicle.model,
+            registration_number=vehicle.registration_number,
+            location=vehicle.location,
+            operational_status=vehicle.operational_status,
+        )
+        for vehicle in db.scalars(stmt).all()
+    ]
+
+
+@router.get("/{public_ref}", response_model=BookingOut)
+def get_booking(
+    public_ref: str,
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(get_current_user),
+) -> BookingOut:
+    booking = db.scalar(select(Booking).where(Booking.public_ref == public_ref))
+    if booking is None:
+        raise HTTPException(status_code=404, detail="Booking not found")
+    customer = db.get(Customer, booking.customer_id)
+    vehicle = db.get(Vehicle, booking.vehicle_id)
+    if customer is None or vehicle is None:
+        raise HTTPException(status_code=500, detail="Booking references a missing record")
+    return _to_out(booking, customer, vehicle)
+
+
+@router.post("/{public_ref}/complete-requirements", response_model=BookingOut)
+def complete_booking_requirements(
+    public_ref: str,
+    body: CompleteBookingRequirementsRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> BookingOut:
+    booking = db.scalar(select(Booking).where(Booking.public_ref == public_ref).with_for_update())
+    if booking is None:
+        raise HTTPException(status_code=404, detail="Booking not found")
+    if booking.status != "reserved":
+        raise HTTPException(
+            status_code=409,
+            detail="Requirements can only be confirmed for a reserved booking",
+        )
+    customer = db.get(Customer, booking.customer_id)
+    vehicle = db.get(Vehicle, booking.vehicle_id)
+    if customer is None or vehicle is None:
+        raise HTTPException(status_code=500, detail="Booking references a missing record")
+    if not booking.requirements_complete:
+        booking.requirements_complete = True
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_label=user.display_name,
+            action="booking_requirements_completed",
+            entity_type="booking",
+            entity_id=booking.id,
+            before={"requirements_complete": False},
+            after={"requirements_complete": True},
+            metadata={"confirmation": body.confirmation.strip()},
+        )
+        db.commit()
+    return _to_out(booking, customer, vehicle)
+
+
+@router.patch("/{public_ref}/schedule", response_model=BookingOut)
+def reschedule_booking(
+    public_ref: str,
+    body: RescheduleBookingRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> BookingOut:
+    if body.ends_at <= body.starts_at:
+        raise HTTPException(status_code=422, detail="Booking end must be after its start")
+    booking = db.scalar(select(Booking).where(Booking.public_ref == public_ref).with_for_update())
+    if booking is None:
+        raise HTTPException(status_code=404, detail="Booking not found")
+    if booking.status != "reserved":
+        raise HTTPException(status_code=409, detail="Only a reserved booking can be rescheduled")
+    vehicle = db.scalar(select(Vehicle).where(Vehicle.id == booking.vehicle_id).with_for_update())
+    customer = db.get(Customer, booking.customer_id)
+    if customer is None or vehicle is None:
+        raise HTTPException(status_code=500, detail="Booking references a missing record")
+    overlap = db.scalar(
+        select(Booking.id).where(
+            Booking.vehicle_id == booking.vehicle_id,
+            Booking.id != booking.id,
+            Booking.status.in_(("reserved", "active")),
+            Booking.starts_at < body.ends_at,
+            Booking.ends_at > body.starts_at,
+        )
+    )
+    if overlap is not None:
+        raise HTTPException(status_code=409, detail="Vehicle already has an overlapping booking")
+    before = {"starts_at": booking.starts_at.isoformat(), "ends_at": booking.ends_at.isoformat()}
+    booking.starts_at = body.starts_at
+    booking.ends_at = body.ends_at
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=user.display_name,
+        action="booking_rescheduled",
+        entity_type="booking",
+        entity_id=booking.id,
+        before=before,
+        after={"starts_at": booking.starts_at.isoformat(), "ends_at": booking.ends_at.isoformat()},
+        metadata={"reason": body.reason.strip()},
+    )
+    db.commit()
+    return _to_out(booking, customer, vehicle)
+
+
+@router.post("/{public_ref}/cancel", response_model=BookingOut)
+def cancel_booking(
+    public_ref: str,
+    body: CancelBookingRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> BookingOut:
+    booking = db.scalar(select(Booking).where(Booking.public_ref == public_ref).with_for_update())
+    if booking is None:
+        raise HTTPException(status_code=404, detail="Booking not found")
+    if booking.status not in ("reserved", "blocked"):
+        # A booking blocked at checkout (damage, technical warning, ...) has no other exit:
+        # it never became active, so it can neither be returned nor completed. Cancelling
+        # it (audited, with a reason) is the only way to close the file.
+        raise HTTPException(
+            status_code=409, detail="Only a reserved or blocked booking can be cancelled"
+        )
+    customer = db.get(Customer, booking.customer_id)
+    vehicle = db.get(Vehicle, booking.vehicle_id)
+    if customer is None or vehicle is None:
+        raise HTTPException(status_code=500, detail="Booking references a missing record")
+    before = {"status": booking.status}
+    booking.status = "cancelled"
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=user.display_name,
+        action="booking_cancelled",
+        entity_type="booking",
+        entity_id=booking.id,
+        before=before,
+        after={"status": booking.status, "reason": body.reason.strip()},
+    )
+    db.commit()
+    return _to_out(booking, customer, vehicle)
+
+
+@router.post("/{public_ref}/return-preview", response_model=ReturnPreviewResult)
+def preview_return(
+    public_ref: str,
+    body: RegisterReturnRequest,
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(get_current_user),
+) -> ReturnPreviewResult:
+    booking, vehicle, evaluation = preview_vehicle_return(db, public_ref, body)
+    return ReturnPreviewResult(
+        booking_ref=booking.public_ref,
+        vehicle_ref=vehicle.public_ref,
+        canonical_odometer_km=evaluation.canonical_odometer_km,
+        submitted_odometer_km=evaluation.submitted_odometer_km,
+        odometer_regression=evaluation.odometer_regression,
+        resulting_odometer_km=evaluation.resulting_odometer_km,
+        resulting_vehicle_status=evaluation.resulting_vehicle_status,
+        status_reason=evaluation.status_reason,
+        status_reason_code=evaluation.status_reason_code,
+        status_reason_params=evaluation.status_reason_params,
+        would_create_quality_issue=evaluation.would_create_quality_issue,
+        attention_reasons=evaluation.attention_reasons,
+        next_booking_risk=(
+            NextBookingRisk(**evaluation.next_booking_risk)
+            if evaluation.next_booking_risk is not None
+            else None
+        ),
+    )
+
+
+@router.post("/{public_ref}/return", response_model=RegisterReturnResult)
+def register_return(
+    public_ref: str,
+    body: RegisterReturnRequest,
+    response: Response,
+    idempotency_key: str = Header(..., alias="Idempotency-Key", min_length=8, max_length=128),
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> RegisterReturnResult:
+    status_code, result = register_vehicle_return(db, public_ref, body, idempotency_key, user)
+    response.status_code = status_code
+    return RegisterReturnResult(**result)

backend/app/api/routers/customers.py

@@ -0,0 +1,42 @@
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy import or_, select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user, get_db
+from app.models.customer import Customer
+from app.schemas import CurrentUser, CustomerOptionOut
+
+router = APIRouter(prefix="/api/v1/customers", tags=["customers"])
+
+
+@router.get("", response_model=list[CustomerOptionOut])
+def search_customers(
+    query: str = Query(min_length=2, max_length=100),
+    limit: int = Query(default=20, ge=1, le=50),
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(get_current_user),
+) -> list[CustomerOptionOut]:
+    term = f"%{query.strip()}%"
+    customers = db.scalars(
+        select(Customer)
+        .where(
+            Customer.merged_into_customer_id.is_(None),
+            Customer.anonymized_at.is_(None),
+            or_(
+                Customer.public_ref.ilike(term),
+                Customer.first_name.ilike(term),
+                Customer.last_name.ilike(term),
+                Customer.email.ilike(term),
+            ),
+        )
+        .order_by(Customer.last_name, Customer.first_name)
+        .limit(limit)
+    ).all()
+    return [
+        CustomerOptionOut(
+            public_ref=customer.public_ref,
+            display_name=f"{customer.first_name} {customer.last_name}",
+            email=customer.email,
+        )
+        for customer in customers
+    ]

backend/app/api/routers/dashboard.py

@@ -0,0 +1,151 @@
+from __future__ import annotations
+
+from datetime import date, datetime
+from typing import Literal
+from zoneinfo import ZoneInfo
+
+from fastapi import APIRouter, Depends
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user, get_db
+from app.core.config import get_settings
+from app.models.booking import Booking
+from app.models.customer import Customer
+from app.models.data_quality import DataQualityIssue
+from app.models.outbox import OutboxEvent
+from app.models.vehicle import Vehicle
+from app.schemas import (
+    AttentionItem,
+    AutomationRunOut,
+    CurrentUser,
+    DashboardOut,
+    EvidenceSignalOut,
+    TodayItem,
+)
+from app.services.operations import compute_metrics
+
+router = APIRouter(prefix="/api/v1/dashboard", tags=["dashboard"])
+settings = get_settings()
+
+_SEVERITY_ORDER = {"high": 0, "medium": 1, "low": 2}
+
+
+def _local_tz() -> ZoneInfo:
+    return ZoneInfo(settings.demo_timezone)
+
+
+def _today() -> date:
+    # Seeded dates are shifted to the real reset moment by `seed_loader.py`'s anchor
+    # shift, so "today" must be real wall-clock time, not the frozen `demo_today` setting.
+    # Timestamps are stored in UTC but the operational day is the local (Europe/Brussels)
+    # calendar day, so a 23:30Z departure belongs to tomorrow's schedule in summer.
+    return datetime.now(_local_tz()).date()
+
+
+def _local_date(value: datetime) -> date:
+    return value.astimezone(_local_tz()).date()
+
+
+@router.get("", response_model=DashboardOut)
+def get_dashboard(
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(get_current_user),
+) -> DashboardOut:
+    metrics = compute_metrics(db)
+
+    vehicles_by_id = {v.id: v for v in db.scalars(select(Vehicle)).all()}
+    customers_by_id = {c.id: c for c in db.scalars(select(Customer)).all()}
+
+    issues = db.scalars(
+        select(DataQualityIssue)
+        .where(DataQualityIssue.status == "open")
+        .order_by(DataQualityIssue.detected_at.asc())
+    ).all()
+    attention_items = []
+    for issue in issues:
+        entity: Vehicle | Customer | None
+        link_type: Literal["vehicle", "customer"]
+        if issue.entity_type == "vehicle":
+            entity = vehicles_by_id.get(issue.entity_id)
+            link_type = "vehicle"
+        else:
+            entity = customers_by_id.get(issue.entity_id)
+            link_type = "customer"
+        link_ref = entity.public_ref if entity else ""
+        # The backend never emits prose for the attention queue -- only stable signal
+        # codes + raw data params, exactly like the issue detail page's evidence list
+        # (see app/services/data_quality.py::_open_issue). The frontend is the one place
+        # that turns these into the operator's selected language; `evidence_json["summary"]`
+        # is a technical fallback only, never rendered here.
+        signals = [
+            EvidenceSignalOut(code=s["code"], params=s.get("params", {}))
+            for s in issue.evidence_json.get("signals", [])
+        ]
+        attention_items.append(
+            AttentionItem(
+                kind="quality_issue",
+                severity=issue.severity,
+                rule_type=issue.rule_type,
+                evidence_signals=signals,
+                link_type=link_type,
+                link_ref=link_ref,
+                issue_ref=issue.public_ref,
+            )
+        )
+    # Curate a credible severity mix instead of letting `high` dominate every slot:
+    # each item's real severity is unchanged, only the display selection is capped per
+    # tier (a handful of "now", then "today", then "later") so a heavy day of high-severity
+    # issues doesn't crowd out medium/low ones the operator should still see.
+    high_items = [i for i in attention_items if i.severity == "high"]
+    medium_items = [i for i in attention_items if i.severity == "medium"]
+    low_items = [i for i in attention_items if i.severity == "low"]
+    attention_items = (high_items[:3] + medium_items[:3] + low_items[:2])[:8]
+
+    today = _today()
+    bookings = db.scalars(select(Booking)).all()
+    today_items: list[TodayItem] = []
+    for b in bookings:
+        vehicle = vehicles_by_id.get(b.vehicle_id)
+        vehicle_ref = vehicle.public_ref if vehicle else ""
+        if _local_date(b.starts_at) == today and b.status in ("reserved", "active"):
+            today_items.append(
+                TodayItem(
+                    kind="departure",
+                    booking_ref=b.public_ref,
+                    vehicle_ref=vehicle_ref,
+                    scheduled_at=b.starts_at,
+                )
+            )
+        if _local_date(b.ends_at) == today and b.status in ("active", "returned"):
+            today_items.append(
+                TodayItem(
+                    kind="return",
+                    booking_ref=b.public_ref,
+                    vehicle_ref=vehicle_ref,
+                    scheduled_at=b.ends_at,
+                )
+            )
+    today_items.sort(key=lambda item: item.scheduled_at)
+
+    recent = db.scalars(select(OutboxEvent).order_by(OutboxEvent.occurred_at.desc()).limit(5)).all()
+    recent_automation = [
+        AutomationRunOut(
+            event_id=str(r.event_id),
+            event_type=r.event_type,
+            aggregate_ref=r.payload_json.get("aggregate_ref", ""),
+            status=r.delivery_status,
+            attempts=r.attempts,
+            last_error=r.last_error,
+            last_error_code=r.last_error_code,
+            occurred_at=r.occurred_at,
+        )
+        for r in recent
+    ]
+
+    return DashboardOut(
+        metrics=metrics,
+        attention_items=attention_items,
+        today=today_items,
+        recent_automation=recent_automation,
+    )

backend/app/api/routers/data_quality.py

@@ -0,0 +1,446 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy import case, func, select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_db, require_operations_manager
+from app.models.booking import Booking
+from app.models.customer import Customer
+from app.models.data_quality import DataQualityIssue
+from app.models.inspection import Inspection
+from app.models.maintenance import MaintenanceRecord
+from app.models.user import User
+from app.models.vehicle import Vehicle
+from app.schemas import (
+    ApplyRecommendedStatusRequest,
+    ApplyRecommendedStatusResult,
+    BulkDataQualityWorkRequest,
+    BulkDataQualityWorkResult,
+    CurrentUser,
+    DataQualityIssueDetailOut,
+    DataQualityIssueOut,
+    DataQualityIssuePageOut,
+    MergeCustomersRequest,
+    MergeCustomersResult,
+    ProvideFieldsRequest,
+    ResolveOdometerRegressionRequest,
+    ResolveOverlapRequest,
+    ScanResultOut,
+    StatusRecommendationOut,
+    VehicleStatusFactsOut,
+)
+from app.services.audit import record_audit_event
+from app.services.data_quality import (
+    apply_recommended_status,
+    defer_issue,
+    merge_customers,
+    preview_vehicle_status_recommendation,
+    provide_missing_fields,
+    reject_issue,
+    resolve_booking_overlap,
+    resolve_odometer_regression,
+    run_scan,
+)
+
+router = APIRouter(prefix="/api/v1/data-quality", tags=["data-quality"])
+
+
+def _to_out(issue: DataQualityIssue) -> DataQualityIssueOut:
+    assignee = issue.assigned_to_user
+    return DataQualityIssueOut(
+        public_ref=issue.public_ref,
+        rule_type=issue.rule_type,
+        entity_type=issue.entity_type,
+        entity_ref=issue.evidence_json.get("entity_ref", ""),
+        severity=issue.severity,
+        status=issue.status,
+        evidence=issue.evidence_json,
+        detected_at=issue.detected_at,
+        due_at=issue.due_at,
+        assigned_to_ref=assignee.public_ref if assignee else None,
+        assigned_to_name=assignee.display_name if assignee else None,
+        overdue=(
+            issue.status == "open" and issue.due_at is not None and issue.due_at < datetime.now(UTC)
+        ),
+        resolved_at=issue.resolved_at,
+    )
+
+
+@router.get("/issues", response_model=list[DataQualityIssueOut] | DataQualityIssuePageOut)
+def list_issues(
+    status: str | None = Query(default=None),
+    rule_type: str | None = Query(default=None),
+    severity: str | None = Query(default=None),
+    assigned_to_ref: str | None = Query(default=None),
+    overdue: bool | None = Query(default=None),
+    demo_only: bool | None = Query(default=None),
+    page: int | None = Query(default=None, ge=1),
+    page_size: int = Query(default=25, ge=1, le=25),
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(require_operations_manager),
+) -> list[DataQualityIssueOut] | DataQualityIssuePageOut:
+    severity_order = case(
+        (DataQualityIssue.severity == "high", 0),
+        (DataQualityIssue.severity == "medium", 1),
+        else_=2,
+    )
+    stmt = select(DataQualityIssue).order_by(
+        DataQualityIssue.due_at.asc().nulls_last(),
+        severity_order,
+        DataQualityIssue.detected_at.desc(),
+    )
+    if status:
+        stmt = stmt.where(DataQualityIssue.status == status)
+    if rule_type:
+        stmt = stmt.where(DataQualityIssue.rule_type == rule_type)
+    if severity:
+        stmt = stmt.where(DataQualityIssue.severity == severity)
+    if assigned_to_ref == "unassigned":
+        stmt = stmt.where(DataQualityIssue.assigned_to_user_id.is_(None))
+    elif assigned_to_ref:
+        stmt = stmt.join(DataQualityIssue.assigned_to_user).where(
+            User.public_ref == assigned_to_ref
+        )
+    if overdue is True:
+        stmt = stmt.where(
+            DataQualityIssue.status == "open",
+            DataQualityIssue.due_at < datetime.now(UTC),
+        )
+    if demo_only is True:
+        # Server-side so the guided demo scenarios are found on any page, not only the
+        # 25 rows currently loaded in the browser.
+        stmt = stmt.where(DataQualityIssue.public_ref.like("DQ-DEMO-%"))
+    total = db.scalar(select(func.count()).select_from(stmt.subquery())) or 0
+    page_number = page or 1
+    issues = db.scalars(
+        stmt if page is None else stmt.offset((page_number - 1) * page_size).limit(page_size)
+    ).all()
+    items = [_to_out(i) for i in issues]
+    if page is None:
+        return items
+    total_pages = max(1, (total + page_size - 1) // page_size)
+    return DataQualityIssuePageOut(
+        items=items,
+        page=min(page_number, total_pages),
+        page_size=page_size,
+        total=total,
+        total_pages=total_pages,
+    )
+
+
+@router.post("/issues/bulk-work", response_model=BulkDataQualityWorkResult)
+def update_issue_work_queue(
+    body: BulkDataQualityWorkRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> BulkDataQualityWorkResult:
+    refs = list(dict.fromkeys(body.issue_refs))
+    if (
+        body.assigned_to_ref is None
+        and not body.clear_assignment
+        and body.due_at is None
+        and not body.clear_due_at
+    ):
+        raise HTTPException(status_code=422, detail="No work queue change was requested")
+    if body.assigned_to_ref is not None and body.clear_assignment:
+        raise HTTPException(status_code=422, detail="Choose an assignee or clear assignment")
+    if body.due_at is not None and body.clear_due_at:
+        raise HTTPException(status_code=422, detail="Choose a due date or clear the due date")
+    if body.due_at is not None and body.due_at.tzinfo is None:
+        raise HTTPException(status_code=422, detail="Due date must include a timezone")
+
+    assignee = None
+    if body.assigned_to_ref is not None:
+        assignee = db.scalar(
+            select(User).where(
+                User.public_ref == body.assigned_to_ref,
+                User.active.is_(True),
+            )
+        )
+        if assignee is None:
+            raise HTTPException(status_code=422, detail="Active assignee not found")
+
+    issues = list(
+        db.scalars(
+            select(DataQualityIssue).where(DataQualityIssue.public_ref.in_(refs)).with_for_update()
+        ).all()
+    )
+    if len(issues) != len(refs):
+        found = {issue.public_ref for issue in issues}
+        missing = next(ref for ref in refs if ref not in found)
+        raise HTTPException(status_code=404, detail=f"Data quality issue {missing} not found")
+
+    for issue in issues:
+        if issue.status != "open":
+            raise HTTPException(
+                status_code=409,
+                detail=f"Data quality issue {issue.public_ref} is not open",
+            )
+        before = {
+            "assigned_to_ref": issue.assigned_to_user.public_ref
+            if issue.assigned_to_user
+            else None,
+            "due_at": issue.due_at.isoformat() if issue.due_at else None,
+        }
+        if body.assigned_to_ref is not None:
+            issue.assigned_to_user = assignee
+        elif body.clear_assignment:
+            issue.assigned_to_user = None
+        if body.due_at is not None:
+            issue.due_at = body.due_at
+        elif body.clear_due_at:
+            issue.due_at = None
+        after = {
+            "assigned_to_ref": assignee.public_ref
+            if body.assigned_to_ref is not None and assignee
+            else (None if body.clear_assignment else before["assigned_to_ref"]),
+            "due_at": issue.due_at.isoformat() if issue.due_at else None,
+        }
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_label=user.display_name,
+            action="data_quality_work_updated",
+            entity_type="data_quality_issue",
+            entity_id=issue.id,
+            before=before,
+            after=after,
+        )
+    db.commit()
+    for issue in issues:
+        db.refresh(issue)
+    return BulkDataQualityWorkResult(updated=[_to_out(issue) for issue in issues])
+
+
+# Every public reference in this system carries its entity type in its own prefix
+# (CUS-/MO-/BK-/INSP-/DQ-). Related-entity typing is resolved from the reference itself,
+# not guessed from the issue's rule_type -- a booking_overlap issue's related refs are
+# bookings, not vehicles, and an inline odometer_regression issue's related refs mix a
+# booking and an inspection ref in the same list.
+_PREFIX_TO_TYPE = {
+    "CUS-": "customer",
+    "MO-": "vehicle",
+    "BK-": "booking",
+    "INSP-": "inspection",
+    "MAINT-": "maintenance",
+    "MNT-": "maintenance",
+}
+
+
+def _entity_type_for_ref(ref: str) -> str | None:
+    for prefix, entity_type in _PREFIX_TO_TYPE.items():
+        if ref.startswith(prefix):
+            return entity_type
+    return None
+
+
+def _snapshot(entity_type: str, ref: str, db: Session) -> dict | None:
+    if entity_type == "customer":
+        customer = db.scalar(select(Customer).where(Customer.public_ref == ref))
+        if customer is None:
+            return None
+        return {
+            "entity_type": "customer",
+            "public_ref": customer.public_ref,
+            "first_name": customer.first_name,
+            "last_name": customer.last_name,
+            "email": customer.email,
+            "phone": customer.phone,
+            "postal_code": customer.postal_code,
+            "city": customer.city,
+        }
+    if entity_type == "vehicle":
+        vehicle = db.scalar(select(Vehicle).where(Vehicle.public_ref == ref))
+        if vehicle is None:
+            return None
+        return {
+            "entity_type": "vehicle",
+            "public_ref": vehicle.public_ref,
+            "registration_number": vehicle.registration_number,
+            "make": vehicle.make,
+            "model": vehicle.model,
+            "location": vehicle.location,
+            "operational_status": vehicle.operational_status,
+            "odometer_km": vehicle.odometer_km,
+        }
+    if entity_type == "booking":
+        booking = db.scalar(select(Booking).where(Booking.public_ref == ref))
+        if booking is None:
+            return None
+        vehicle = db.get(Vehicle, booking.vehicle_id)
+        customer = db.get(Customer, booking.customer_id)
+        return {
+            "entity_type": "booking",
+            "public_ref": booking.public_ref,
+            "status": booking.status,
+            "starts_at": booking.starts_at.isoformat(),
+            "ends_at": booking.ends_at.isoformat(),
+            "vehicle_ref": vehicle.public_ref if vehicle else None,
+            "customer_ref": customer.public_ref if customer else None,
+            "end_odometer_km": booking.end_odometer_km,
+        }
+    if entity_type == "inspection":
+        inspection = db.scalar(select(Inspection).where(Inspection.public_ref == ref))
+        if inspection is None:
+            return None
+        booking = db.get(Booking, inspection.booking_id)
+        return {
+            "entity_type": "inspection",
+            "public_ref": inspection.public_ref,
+            "type": inspection.type,
+            "odometer_km": inspection.odometer_km,
+            "completed_at": inspection.completed_at.isoformat(),
+            "booking_ref": booking.public_ref if booking else None,
+        }
+    if entity_type == "maintenance":
+        record = db.scalar(select(MaintenanceRecord).where(MaintenanceRecord.public_ref == ref))
+        if record is None:
+            return None
+        return {
+            "entity_type": "maintenance",
+            "public_ref": record.public_ref,
+            "odometer_km": record.odometer_km,
+            "occurred_at": record.occurred_at.isoformat(),
+            "category": record.category,
+        }
+    return None
+
+
+@router.get("/issues/{public_ref}", response_model=DataQualityIssueDetailOut)
+def get_issue(
+    public_ref: str,
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(require_operations_manager),
+) -> DataQualityIssueDetailOut:
+    issue = db.scalar(select(DataQualityIssue).where(DataQualityIssue.public_ref == public_ref))
+    if issue is None:
+        raise HTTPException(status_code=404, detail="Data quality issue not found")
+    base = _to_out(issue)
+    related_refs = issue.evidence_json.get("related_refs", [])
+    related_snapshots = []
+    for ref in related_refs:
+        entity_type = _entity_type_for_ref(ref)
+        if entity_type is None:
+            continue
+        snap = _snapshot(entity_type, ref, db)
+        if snap is not None:
+            related_snapshots.append(snap)
+    return DataQualityIssueDetailOut(
+        **base.model_dump(),
+        entity_snapshot=_snapshot(issue.entity_type, base.entity_ref, db),
+        related_snapshots=related_snapshots,
+    )
+
+
+@router.post("/issues/{public_ref}/defer", response_model=DataQualityIssueOut)
+def defer(
+    public_ref: str,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> DataQualityIssueOut:
+    issue = defer_issue(db, public_ref, user)
+    return _to_out(issue)
+
+
+@router.post("/issues/{public_ref}/reject", response_model=DataQualityIssueOut)
+def reject(
+    public_ref: str,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> DataQualityIssueOut:
+    issue = reject_issue(db, public_ref, user)
+    return _to_out(issue)
+
+
+@router.post("/issues/{public_ref}/merge-customers", response_model=MergeCustomersResult)
+def merge(
+    public_ref: str,
+    body: MergeCustomersRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> MergeCustomersResult:
+    result = merge_customers(db, public_ref, body.survivor_ref, body.field_overrides, user)
+    return MergeCustomersResult(**result)
+
+
+@router.post("/issues/{public_ref}/provide-fields", response_model=DataQualityIssueOut)
+def provide_fields(
+    public_ref: str,
+    body: ProvideFieldsRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> DataQualityIssueOut:
+    issue = provide_missing_fields(db, public_ref, body.fields, user)
+    return _to_out(issue)
+
+
+@router.post("/issues/{public_ref}/resolve-odometer-regression", response_model=DataQualityIssueOut)
+def resolve_odometer(
+    public_ref: str,
+    body: ResolveOdometerRegressionRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> DataQualityIssueOut:
+    issue = resolve_odometer_regression(db, public_ref, body, user)
+    return _to_out(issue)
+
+
+@router.post("/issues/{public_ref}/resolve-overlap", response_model=DataQualityIssueOut)
+def resolve_overlap(
+    public_ref: str,
+    body: ResolveOverlapRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> DataQualityIssueOut:
+    issue = resolve_booking_overlap(db, public_ref, body.booking_ref, body.note, user)
+    return _to_out(issue)
+
+
+@router.post("/issues/{public_ref}/status-recommendation", response_model=StatusRecommendationOut)
+def status_recommendation(
+    public_ref: str,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> StatusRecommendationOut:
+    """Non-mutating preview: computes the recommendation without changing anything,
+    resolving no issue and writing no audit event. Safe to call repeatedly."""
+    _issue, _vehicle, recommendation, token = preview_vehicle_status_recommendation(db, public_ref)
+    return StatusRecommendationOut(
+        current_status=recommendation.current_status,
+        recommended_status=recommendation.recommended_status,
+        recommendation_code=recommendation.recommendation_code,
+        safe_to_apply=recommendation.safe_to_apply,
+        manual_review_required=recommendation.manual_review_required,
+        facts=VehicleStatusFactsOut(**recommendation.facts.as_dict()),
+        blocking_reasons=recommendation.blocking_reasons,
+        recommendation_token=token,
+    )
+
+
+@router.post(
+    "/issues/{public_ref}/apply-recommended-status", response_model=ApplyRecommendedStatusResult
+)
+def apply_status(
+    public_ref: str,
+    body: ApplyRecommendedStatusRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> ApplyRecommendedStatusResult:
+    issue, applied_status, reason_code = apply_recommended_status(
+        db, public_ref, user, body.recommendation_token
+    )
+    return ApplyRecommendedStatusResult(
+        issue=_to_out(issue), applied_status=applied_status, reason_code=reason_code
+    )
+
+
+@router.post("/scan", response_model=ScanResultOut)
+def scan(
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> ScanResultOut:
+    result = run_scan(db, actor_label=user.display_name, actor_type="user")
+    return ScanResultOut(created=result.created)

backend/app/api/routers/demo.py

@@ -0,0 +1,186 @@
+from __future__ import annotations
+
+import threading
+import time
+import uuid
+from datetime import UTC, datetime
+
+from fastapi import APIRouter, Depends, HTTPException, Request, Response, status
+from sqlalchemy import func, select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user, get_db, require_operations_manager
+from app.core.config import get_settings
+from app.core.db import begin_exclusive_demo_reset, end_exclusive_demo_reset, engine
+from app.core.security import SessionPayload, create_session_token, read_session_token
+from app.models.audit import AuditEvent
+from app.models.user import User
+from app.schemas import CurrentUser, DemoLoginRequest, DemoManifestOut
+from app.seed_loader import reset_and_seed
+from app.services.audit import record_audit_event
+from app.services.demo_manifest import build_demo_manifest, scenario_integrity_report
+from app.services.sessions import revoke_session
+
+router = APIRouter(prefix="/api/v1/demo", tags=["demo"])
+settings = get_settings()
+_reset_guard = threading.Lock()
+_RESET_ADVISORY_LOCK_ID = 706_533_149
+
+
+@router.get("/manifest", response_model=DemoManifestOut)
+def demo_manifest(db: Session = Depends(get_db)) -> DemoManifestOut:
+    if not settings.mobilityops_demo_mode:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Demo mode is disabled")
+    # Deliberately unauthenticated: the demo-entry screen and the permanent demo badge
+    # both need this before any session exists. Nothing here is sensitive — it's the same
+    # honest "what is this demo" summary a logged-in user would see.
+    return build_demo_manifest(db)
+
+
+@router.post("/login", response_model=CurrentUser)
+def demo_login(
+    body: DemoLoginRequest, response: Response, db: Session = Depends(get_db)
+) -> CurrentUser:
+    if not settings.mobilityops_demo_mode:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Demo mode is disabled")
+    public_ref = "USR-OPS" if body.role == "operations_manager" else "USR-EMP"
+    user = db.scalar(select(User).where(User.public_ref == public_ref))
+    if user is None:
+        raise LookupError("Demo users are missing; run the seed loader first.")
+
+    token = create_session_token(
+        SessionPayload(
+            user_id=str(user.id),
+            public_ref=user.public_ref,
+            role=user.role,
+            display_name=user.display_name,
+            issued_at=int(time.time()),
+            session_id=str(uuid.uuid4()),
+        )
+    )
+    response.set_cookie(
+        settings.session_cookie_name,
+        token,
+        httponly=True,
+        samesite="lax",
+        secure=settings.session_cookie_secure,
+        max_age=settings.session_ttl_seconds,
+    )
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_id=user.id,
+        actor_label=user.display_name,
+        action="demo_login",
+        entity_type="user",
+        entity_id=user.id,
+    )
+    db.commit()
+    return CurrentUser(public_ref=user.public_ref, display_name=user.display_name, role=body.role)
+
+
+@router.get("/session", response_model=CurrentUser)
+def get_session(response: Response, user: CurrentUser = Depends(get_current_user)) -> CurrentUser:
+    # Never let the browser (or an intermediary) cache an authentication check — a stale
+    # cached 200 here would keep showing a logged-out browser as authenticated.
+    response.headers["Cache-Control"] = "no-store"
+    return user
+
+
+@router.post("/logout")
+def demo_logout(request: Request, response: Response, db: Session = Depends(get_db)) -> dict:
+    token = request.cookies.get(settings.session_cookie_name)
+    payload = read_session_token(token) if token else None
+    if payload is not None and token is not None:
+        revoke_session(db, token, payload)
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_id=uuid.UUID(payload.user_id),
+            actor_label=payload.display_name,
+            action="demo_logout",
+            entity_type="user",
+        )
+        db.commit()
+    response.delete_cookie(settings.session_cookie_name)
+    return {"status": "logged_out"}
+
+
+@router.post("/reset")
+def demo_reset(
+    response: Response,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> dict:
+    if not settings.mobilityops_demo_mode:
+        # Outside demo mode the reset endpoint must not exist at all: it wipes
+        # operational data and replaces it with synthetic records.
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Demo mode is disabled")
+    if not settings.demo_allow_reset:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Demo reset is disabled on this deployment.",
+        )
+    if not _reset_guard.acquire(blocking=False):
+        raise HTTPException(status_code=409, detail="A demo reset is already running.")
+    replica_lock_connection = None
+    try:
+        # A session-level lock on its own connection rejects another replica immediately;
+        # the main DB session can then safely end its auth read transaction and wait on
+        # the normal shared/exclusive data barrier without releasing this replica guard.
+        replica_lock_connection = engine.connect()
+        locked = replica_lock_connection.scalar(
+            select(func.pg_try_advisory_lock(_RESET_ADVISORY_LOCK_ID))
+        )
+        if not locked:
+            raise HTTPException(status_code=409, detail="A demo reset is already running.")
+        begin_exclusive_demo_reset(db)
+        # The audit timestamp is shared by every replica. A process-local monotonic
+        # timestamp cannot protect a multi-replica deployment.
+        last_reset_at = db.scalar(
+            select(AuditEvent.occurred_at)
+            .where(AuditEvent.action == "demo_reset")
+            .order_by(AuditEvent.occurred_at.desc())
+            .limit(1)
+        )
+        elapsed = (datetime.now(UTC) - last_reset_at).total_seconds() if last_reset_at else None
+        if elapsed is not None and elapsed < settings.demo_reset_cooldown_seconds:
+            retry_after = max(1, int(settings.demo_reset_cooldown_seconds - elapsed + 0.999))
+            raise HTTPException(
+                status_code=429,
+                detail=f"Demo reset is cooling down. Retry in {retry_after} seconds.",
+                headers={"Retry-After": str(retry_after)},
+            )
+        result = reset_and_seed(db, preserve_integration_telemetry=True, commit=False)
+        integrity = scenario_integrity_report(db)
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_label=user.display_name,
+            action="demo_reset",
+            entity_type="system",
+            metadata={
+                "counts": result.counts,
+                "anchor_date": result.anchor_date.isoformat(),
+                "scenario_integrity": integrity,
+            },
+        )
+        db.commit()
+        end_exclusive_demo_reset(db)
+    finally:
+        if replica_lock_connection is not None:
+            try:
+                replica_lock_connection.scalar(
+                    select(func.pg_advisory_unlock(_RESET_ADVISORY_LOCK_ID))
+                )
+            finally:
+                replica_lock_connection.close()
+        _reset_guard.release()
+    response.delete_cookie(settings.session_cookie_name)
+    return {
+        "status": "reset",
+        "counts": result.counts,
+        "anchor_date": result.anchor_date.isoformat(),
+        "seeded_at": result.seeded_at.isoformat(),
+        "scenario_integrity": integrity,
+    }

backend/app/api/routers/integration_status.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_db, require_operations_manager
+from app.schemas import CurrentUser, IntegrationStatusOut
+from app.services.integration_status import derive_mcp_hub_status, derive_n8n_status
+
+router = APIRouter(prefix="/api/v1/integrations", tags=["integrations"])
+
+
+@router.get("/status", response_model=IntegrationStatusOut)
+def integration_status(
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(require_operations_manager),
+) -> IntegrationStatusOut:
+    return IntegrationStatusOut(
+        n8n=derive_n8n_status(db),
+        mcp_hub=derive_mcp_hub_status(db),
+    )

backend/app/api/routers/integrations.py

@@ -0,0 +1,302 @@
+from __future__ import annotations
+
+import hashlib
+import hmac
+import uuid
+from datetime import UTC, datetime
+from pathlib import Path
+
+from fastapi import APIRouter, Depends, Header
+from sqlalchemy import func, select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_db
+from app.core.config import get_settings
+from app.core.errors import AppError
+from app.models.audit import AuditEvent
+from app.models.outbox import OutboxEvent
+from app.schemas import (
+    N8nHeartbeatIn,
+    N8nHeartbeatResult,
+    ProcedureDocumentOut,
+    ProcedureListOut,
+    ProcedureSyncResultIn,
+    ProcedureSyncResultResult,
+    ReturnCallbackIn,
+    ScanResultOut,
+    WorkflowErrorReportIn,
+    WorkflowErrorReportResult,
+)
+from app.services.audit import record_audit_event
+from app.services.data_quality import run_scan
+from app.services.knowledge.procedures import iter_procedure_documents
+
+router = APIRouter(prefix="/api/v1/integrations/n8n", tags=["integrations"])
+settings = get_settings()
+
+_CANONICAL_WORKFLOW_NAMES = frozenset(
+    {
+        "Fleet Ops — Vehicle Return Orchestration",
+        "Fleet Ops — Scheduled Data Quality Scan",
+        "Fleet Ops — RAGcore Procedure Sync",
+        "Fleet Ops — Workflow Error Handler",
+    }
+)
+
+
+def _require_service_token(service_token: str) -> None:
+    # Constant-time comparison: a plain ``!=`` leaks how many leading bytes matched.
+    if not hmac.compare_digest(
+        service_token.encode("utf-8"), settings.n8n_callback_token.encode("utf-8")
+    ):
+        raise AppError("UNAUTHORIZED_SERVICE", "Invalid service token.", status_code=401)
+
+
+def _lock_idempotency_key(db: Session, namespace: str, key: str) -> None:
+    """Serialize callback check+insert by a stable, transaction-scoped key."""
+    digest = hashlib.sha256(f"{namespace}:{key}".encode()).digest()
+    lock_id = int.from_bytes(digest[:8], byteorder="big", signed=True)
+    db.scalar(select(func.pg_advisory_xact_lock(lock_id)))
+
+
+@router.post("/heartbeat", response_model=N8nHeartbeatResult)
+def workflow_heartbeat(
+    body: N8nHeartbeatIn,
+    service_token: str = Header(..., alias="X-Service-Token"),
+    db: Session = Depends(get_db),
+) -> N8nHeartbeatResult:
+    """Authenticated, idempotent execution evidence from a canonical n8n workflow."""
+    _require_service_token(service_token)
+    if body.workflow_name not in _CANONICAL_WORKFLOW_NAMES:
+        raise AppError("UNKNOWN_WORKFLOW", "Unknown Fleet Ops workflow.", status_code=422)
+    _lock_idempotency_key(db, "n8n_workflow_heartbeat", f"{body.execution_id}:{body.status}")
+    already_recorded = (
+        db.scalar(
+            select(AuditEvent.id).where(
+                AuditEvent.action == "n8n_workflow_heartbeat",
+                AuditEvent.metadata_json["execution_id"].astext == body.execution_id,
+                AuditEvent.after_json["status"].astext == body.status,
+            )
+        )
+        is not None
+    )
+    if not already_recorded:
+        record_audit_event(
+            db,
+            actor_type="service",
+            actor_label="n8n workflow heartbeat",
+            action="n8n_workflow_heartbeat",
+            entity_type="automation",
+            after={
+                "workflow_id": body.workflow_id,
+                "workflow_name": body.workflow_name,
+                "status": body.status,
+            },
+            metadata={"execution_id": body.execution_id},
+        )
+        db.commit()
+    return N8nHeartbeatResult(
+        status="already_registered" if already_recorded else "registered",
+        execution_id=body.execution_id,
+        occurred_at=datetime.now(UTC),
+    )
+
+
+@router.post("/return-callback")
+def return_callback(
+    body: ReturnCallbackIn,
+    idempotency_key: str = Header(..., alias="Idempotency-Key"),
+    service_token: str = Header(..., alias="X-Service-Token"),
+    db: Session = Depends(get_db),
+) -> dict:
+    _require_service_token(service_token)
+
+    try:
+        event_id = uuid.UUID(idempotency_key)
+    except ValueError as exc:
+        raise AppError(
+            "INVALID_IDEMPOTENCY_KEY", "Idempotency-Key must be the event's UUID.", status_code=422
+        ) from exc
+
+    event = db.scalar(select(OutboxEvent).where(OutboxEvent.event_id == event_id).with_for_update())
+    if event is None:
+        raise AppError("EVENT_NOT_FOUND", "No outbox event matches this event ID.", status_code=404)
+    if body.event_id != event_id:
+        raise AppError(
+            "CALLBACK_EVENT_MISMATCH",
+            "Callback event_id does not match Idempotency-Key.",
+            status_code=409,
+        )
+    try:
+        expected_correlation_id = uuid.UUID(str(event.payload_json["correlation_id"]))
+    except (KeyError, TypeError, ValueError) as exc:
+        raise AppError(
+            "INVALID_EVENT_CORRELATION",
+            "The stored outbox event has no valid correlation ID.",
+            status_code=409,
+        ) from exc
+    if body.correlation_id != expected_correlation_id:
+        raise AppError(
+            "CALLBACK_CORRELATION_MISMATCH",
+            "Callback correlation_id does not match the outbox event.",
+            status_code=409,
+        )
+
+    # Idempotent by event ID: n8n or our own dispatcher may redeliver the same event
+    # (e.g. a lost response after a timeout), so this callback must not double-record.
+    already_recorded = (
+        db.scalar(
+            select(AuditEvent.id).where(
+                AuditEvent.action == "n8n_return_followup_recorded",
+                AuditEvent.metadata_json["event_id"].astext == str(event_id),
+            )
+        )
+        is not None
+    )
+    if not already_recorded:
+        record_audit_event(
+            db,
+            actor_type="service",
+            actor_label="n8n",
+            action="n8n_return_followup_recorded",
+            entity_type="booking",
+            correlation_id=expected_correlation_id,
+            after={"follow_up": body.follow_up, "summary": body.summary},
+            metadata={"event_id": str(event_id)},
+        )
+        db.commit()
+
+    return {
+        "status": "recorded",
+        "event_id": str(event_id),
+        "occurred_at": datetime.now(UTC).isoformat(),
+    }
+
+
+@router.post("/scheduled-scan", response_model=ScanResultOut)
+def scheduled_scan(
+    service_token: str = Header(..., alias="X-Service-Token"),
+    db: Session = Depends(get_db),
+) -> ScanResultOut:
+    """Triggered by the scheduled n8n quality-scan workflow. Narrow, read-mostly, and
+    safe to call repeatedly: run_scan() only ever creates an issue for a condition that
+    doesn't already have one open, so a duplicate or overlapping trigger does no
+    duplicate domain work -- it just reports zero new issues for anything already known."""
+    _require_service_token(service_token)
+
+    result = run_scan(db, actor_label="n8n scheduled scan", actor_type="service")
+    return ScanResultOut(created=result.created)
+
+
+@router.post("/workflow-error", response_model=WorkflowErrorReportResult)
+def workflow_error(
+    body: WorkflowErrorReportIn,
+    service_token: str = Header(..., alias="X-Service-Token"),
+    db: Session = Depends(get_db),
+) -> WorkflowErrorReportResult:
+    """Receives a bounded, secret-free failure report from the central n8n "Fleet Ops --
+    Workflow Error Handler" workflow, which is attached as the Error Workflow on every
+    other Fleet Ops n8n workflow. Idempotent on execution_id: n8n may redeliver the same
+    error report (e.g. after a timed-out response), so this must not double-record."""
+    _require_service_token(service_token)
+    _lock_idempotency_key(db, "n8n_workflow_failure", body.execution_id)
+
+    already_recorded = (
+        db.scalar(
+            select(AuditEvent.id).where(
+                AuditEvent.action == "n8n_workflow_failure_registered",
+                AuditEvent.metadata_json["execution_id"].astext == body.execution_id,
+            )
+        )
+        is not None
+    )
+    if not already_recorded:
+        record_audit_event(
+            db,
+            actor_type="service",
+            actor_label="n8n error handler",
+            action="n8n_workflow_failure_registered",
+            entity_type="automation",
+            correlation_id=body.correlation_id,
+            after={
+                "workflow_id": body.workflow_id,
+                "workflow_name": body.workflow_name,
+                "error_category": body.error_category,
+                "error_summary": body.error_summary,
+                "trigger_context": body.trigger_context,
+                "attempt": body.attempt,
+                "retry_action": body.retry_action,
+                "failed_at": body.failed_at.isoformat(),
+            },
+            metadata={"execution_id": body.execution_id},
+        )
+        db.commit()
+
+    return WorkflowErrorReportResult(
+        status="already_registered" if already_recorded else "registered",
+        execution_id=body.execution_id,
+        occurred_at=datetime.now(UTC),
+    )
+
+
+@router.get("/procedures", response_model=ProcedureListOut)
+def list_procedures(service_token: str = Header(..., alias="X-Service-Token")) -> ProcedureListOut:
+    """Read-only source list for the RAGcore Procedure Sync workflow: every procedure
+    Markdown file Fleet Ops ships, across every supported language, with a stable
+    per-document id (source_id) and a content hash so the caller can detect changes
+    without re-fetching content it already has."""
+    _require_service_token(service_token)
+
+    documents = [
+        ProcedureDocumentOut(
+            id=doc.source_id,
+            language=doc.language,
+            document_id=doc.document_id,
+            title=doc.title,
+            version=doc.version,
+            content=doc.content,
+            content_hash=doc.content_hash,
+        )
+        for doc in iter_procedure_documents(Path(settings.knowledge_dir))
+    ]
+    return ProcedureListOut(documents=documents)
+
+
+@router.post("/procedures-sync-result", response_model=ProcedureSyncResultResult)
+def procedures_sync_result(
+    body: ProcedureSyncResultIn,
+    service_token: str = Header(..., alias="X-Service-Token"),
+    db: Session = Depends(get_db),
+) -> ProcedureSyncResultResult:
+    """Receives a summary (counts only, no document content) from the n8n "Fleet Ops --
+    RAGcore Procedure Sync" workflow once it finishes uploading procedures to RAGcore.
+    Idempotent on execution_id, matching the workflow-error and return-callback pattern."""
+    _require_service_token(service_token)
+    _lock_idempotency_key(db, "n8n_procedure_sync", body.execution_id)
+
+    already_recorded = (
+        db.scalar(
+            select(AuditEvent.id).where(
+                AuditEvent.action == "n8n_procedures_synced",
+                AuditEvent.metadata_json["execution_id"].astext == body.execution_id,
+            )
+        )
+        is not None
+    )
+    if not already_recorded:
+        record_audit_event(
+            db,
+            actor_type="service",
+            actor_label="n8n procedure sync",
+            action="n8n_procedures_synced",
+            entity_type="automation",
+            after={"synced": body.synced, "failed": body.failed},
+            metadata={"execution_id": body.execution_id},
+        )
+        db.commit()
+
+    return ProcedureSyncResultResult(
+        status="already_registered" if already_recorded else "registered",
+        execution_id=body.execution_id,
+        occurred_at=datetime.now(UTC),
+    )

backend/app/api/routers/knowledge.py

@@ -0,0 +1,169 @@
+from __future__ import annotations
+
+import hashlib
+import uuid
+from typing import Literal
+
+from fastapi import APIRouter, Depends, HTTPException, Request, status
+from pydantic import BaseModel, Field
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user, get_db
+from app.core.config import get_settings
+from app.core.ratelimit import SlidingWindowLimiter
+from app.models.audit import AuditEvent
+from app.schemas import CurrentUser
+from app.services.audit import record_audit_event
+from app.services.knowledge import GroundedAnswer, KnowledgeHealth, get_knowledge_provider
+
+router = APIRouter(prefix="/api/v1/knowledge", tags=["knowledge"])
+settings = get_settings()
+_question_limiter = (
+    SlidingWindowLimiter(
+        max_requests=settings.knowledge_max_requests,
+        window_seconds=settings.knowledge_rate_limit_window_seconds,
+    )
+    if settings.knowledge_max_requests > 0
+    else None
+)
+
+SupportedLanguage = Literal["nl-BE", "en-GB", "fr-BE"]
+
+
+class AskQuestionRequest(BaseModel):
+    question: str = Field(min_length=3, max_length=1000)
+    language: SupportedLanguage = "en-GB"
+
+
+class KnowledgeFeedbackRequest(BaseModel):
+    correlation_id: uuid.UUID
+    helpful: bool
+
+
+@router.post("/questions", response_model=GroundedAnswer)
+def ask_question(
+    body: AskQuestionRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> GroundedAnswer:
+    if _question_limiter is not None:
+        forwarded = request.headers.get("x-forwarded-for", "")
+        client_ip = (
+            forwarded.split(",")[-1].strip()
+            if forwarded
+            else request.client.host
+            if request.client
+            else "unknown"
+        )
+        token = request.cookies.get(settings.session_cookie_name, "")
+        session_key = hashlib.sha256(token.encode("utf-8")).hexdigest()
+        retry_after = max(
+            _question_limiter.consume(f"ip:{client_ip}"),
+            _question_limiter.consume(f"session:{session_key}"),
+        )
+        if retry_after:
+            raise HTTPException(
+                status_code=status.HTTP_429_TOO_MANY_REQUESTS,
+                detail="Too many knowledge questions. Try again later.",
+                headers={"Retry-After": str(retry_after)},
+            )
+    correlation_id = str(uuid.uuid4())
+    provider = get_knowledge_provider()
+    answer = provider.ask(body.question, correlation_id, body.language)
+
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=user.display_name,
+        action="knowledge_question_asked",
+        entity_type="knowledge",
+        correlation_id=uuid.UUID(correlation_id),
+        metadata={
+            "evidence_state": answer.evidence_state,
+            "provider": answer.provider,
+            "source_ids": [s.document_id for s in answer.sources],
+            "question_length": len(body.question),
+            "language": body.language,
+        },
+    )
+    db.commit()
+    return answer
+
+
+@router.post("/feedback")
+def record_feedback(
+    body: KnowledgeFeedbackRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> dict[str, str]:
+    question_event = db.scalar(
+        select(AuditEvent.id).where(
+            AuditEvent.action == "knowledge_question_asked",
+            AuditEvent.correlation_id == body.correlation_id,
+            AuditEvent.actor_label == user.display_name,
+        )
+    )
+    if question_event is None:
+        raise HTTPException(status_code=404, detail="Knowledge exchange not found")
+
+    existing = db.scalar(
+        select(AuditEvent).where(
+            AuditEvent.action == "knowledge_feedback_recorded",
+            AuditEvent.correlation_id == body.correlation_id,
+            AuditEvent.actor_label == user.display_name,
+        )
+    )
+    if existing is not None:
+        existing.metadata_json = {"helpful": body.helpful}
+    else:
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_label=user.display_name,
+            action="knowledge_feedback_recorded",
+            entity_type="knowledge",
+            correlation_id=body.correlation_id,
+            metadata={"helpful": body.helpful},
+        )
+    db.commit()
+    return {"status": "recorded"}
+
+
+@router.get("/status", response_model=KnowledgeHealth)
+def knowledge_status(
+    language: SupportedLanguage = "en-GB",
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(get_current_user),
+) -> KnowledgeHealth:
+    health = get_knowledge_provider().health(language)
+    if health.provider != "ragcore":
+        return health
+
+    latest_sync = db.scalar(
+        select(AuditEvent)
+        .where(AuditEvent.action == "n8n_procedures_synced")
+        .order_by(AuditEvent.occurred_at.desc())
+        .limit(1)
+    )
+    if latest_sync is None:
+        return health
+
+    reported = latest_sync.after_json or {}
+    synced = reported.get("synced")
+    failed = reported.get("failed")
+    return health.model_copy(
+        update={
+            "reported_synced_document_count": synced if isinstance(synced, int) else None,
+            "reported_failed_document_count": failed if isinstance(failed, int) else None,
+            "last_sync_at": latest_sync.occurred_at,
+            # A persisted sync callback is useful additional provenance, but must not
+            # downgrade stronger provider-side verification to merely "reported".
+            "statistics_state": (
+                health.statistics_state
+                if health.statistics_state == "verified"
+                else "sync_reported"
+            ),
+        }
+    )

backend/app/api/routers/mcp_integrations.py

@@ -0,0 +1,204 @@
+from __future__ import annotations
+
+import uuid
+from datetime import date
+
+from fastapi import APIRouter, Depends, Header, Query, Response
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.api.deps import McpClientContext, get_db, require_mcp_service_token
+from app.core.config import get_settings
+from app.core.errors import AppError
+from app.models.booking import Booking
+from app.models.data_quality import DataQualityIssue
+from app.models.vehicle import Vehicle
+from app.schemas import (
+    AttentionVehicleOut,
+    McpKnowledgeSearchRequest,
+    McpVehicleDetailOut,
+    OperationsSummaryOut,
+)
+from app.services.audit import record_audit_event
+from app.services.knowledge import GroundedAnswer, get_knowledge_provider
+from app.services.operations import compute_metrics, list_attention_vehicles
+
+router = APIRouter(prefix="/api/v1/integrations/mcp", tags=["mcp"])
+settings = get_settings()
+
+
+def get_correlation_id(
+    x_correlation_id: str | None = Header(default=None, alias="X-Correlation-Id"),
+) -> str:
+    """Preserve the Hub's own inbound correlation ID through MCP client -> Hub -> Fleet
+    Ops -> RAGcore -> Fleet Ops Audit; only mint a fresh one when none was supplied or
+    it isn't a valid UUID (per the task's own correlation-propagation contract)."""
+    if x_correlation_id:
+        try:
+            return str(uuid.UUID(x_correlation_id))
+        except ValueError:
+            pass
+    return str(uuid.uuid4())
+
+
+def _audit_service_request(
+    db: Session,
+    *,
+    reported_client_id: str,
+    tool: str,
+    status_label: str,
+    correlation_id: str,
+    metadata: dict[str, object] | None = None,
+) -> None:
+    record_audit_event(
+        db,
+        actor_type="service",
+        # The shared service token authenticates the Hub, not the caller identity that
+        # the Hub reports in a header. Keep attribution authoritative and retain the
+        # reported value only as explicitly non-authenticated diagnostic metadata.
+        actor_label="itworx-mcp-hub",
+        action="mcp_tool_request",
+        entity_type="mcp_tool",
+        correlation_id=uuid.UUID(correlation_id),
+        metadata={
+            "tool": tool,
+            "status": status_label,
+            "reported_client_id": reported_client_id,
+            **(metadata or {}),
+        },
+    )
+    db.commit()
+
+
+def _set_trace_headers(response: Response, correlation_id: str, tenant: str) -> None:
+    response.headers["X-Correlation-Id"] = correlation_id
+    response.headers["X-Tenant-Id"] = tenant
+    response.headers["Cache-Control"] = "no-store"
+
+
+@router.get("/operations-summary", response_model=OperationsSummaryOut)
+def operations_summary(
+    response: Response,
+    db: Session = Depends(get_db),
+    client: McpClientContext = Depends(require_mcp_service_token),
+    correlation_id: str = Depends(get_correlation_id),
+) -> OperationsSummaryOut:
+    metrics = compute_metrics(db)
+    _set_trace_headers(response, correlation_id, client.tenant)
+    _audit_service_request(
+        db,
+        reported_client_id=client.reported_client_id,
+        tool="fleet_ops_get_operations_summary",
+        status_label="ok",
+        correlation_id=correlation_id,
+    )
+    return OperationsSummaryOut(tenant=client.tenant, metrics=metrics)
+
+
+@router.get("/attention-vehicles", response_model=list[AttentionVehicleOut])
+def attention_vehicles(
+    response: Response,
+    minimum_severity: str = Query(default="medium", pattern="^(low|medium|high)$"),
+    date_filter: date | None = Query(default=None, alias="date"),
+    limit: int = Query(default=20, ge=1, le=50),
+    db: Session = Depends(get_db),
+    client: McpClientContext = Depends(require_mcp_service_token),
+    correlation_id: str = Depends(get_correlation_id),
+) -> list[AttentionVehicleOut]:
+    results = list_attention_vehicles(
+        db, minimum_severity=minimum_severity, on_or_before=date_filter, limit=limit
+    )
+    _set_trace_headers(response, correlation_id, client.tenant)
+    _audit_service_request(
+        db,
+        reported_client_id=client.reported_client_id,
+        tool="fleet_ops_list_attention_vehicles",
+        status_label="ok",
+        correlation_id=correlation_id,
+    )
+    return [AttentionVehicleOut(**r) for r in results]
+
+
+@router.get("/vehicles/{vehicle_ref}", response_model=McpVehicleDetailOut)
+def vehicle_details(
+    vehicle_ref: str,
+    response: Response,
+    db: Session = Depends(get_db),
+    client: McpClientContext = Depends(require_mcp_service_token),
+    correlation_id: str = Depends(get_correlation_id),
+) -> McpVehicleDetailOut:
+    _set_trace_headers(response, correlation_id, client.tenant)
+    vehicle = db.scalar(select(Vehicle).where(Vehicle.public_ref == vehicle_ref))
+    if vehicle is None:
+        _audit_service_request(
+            db,
+            reported_client_id=client.reported_client_id,
+            tool="fleet_ops_get_vehicle_details",
+            status_label="not_found",
+            correlation_id=correlation_id,
+        )
+        raise AppError("VEHICLE_NOT_FOUND", "Vehicle not found.", status_code=404)
+
+    open_issue_count = len(
+        db.scalars(
+            select(DataQualityIssue.id).where(
+                DataQualityIssue.entity_type == "vehicle",
+                DataQualityIssue.entity_id == vehicle.id,
+                DataQualityIssue.status == "open",
+            )
+        ).all()
+    )
+    current_booking = db.scalar(
+        select(Booking).where(Booking.vehicle_id == vehicle.id, Booking.status == "active")
+    )
+
+    _audit_service_request(
+        db,
+        reported_client_id=client.reported_client_id,
+        tool="fleet_ops_get_vehicle_details",
+        status_label="ok",
+        correlation_id=correlation_id,
+    )
+    return McpVehicleDetailOut(
+        public_ref=vehicle.public_ref,
+        make=vehicle.make,
+        model=vehicle.model,
+        model_year=vehicle.model_year,
+        location=vehicle.location,
+        operational_status=vehicle.operational_status,
+        odometer_km=vehicle.odometer_km,
+        next_service_km=vehicle.next_service_km,
+        open_quality_issue_count=open_issue_count,
+        current_booking_ref=current_booking.public_ref if current_booking else None,
+    )
+
+
+@router.post("/search-knowledge", response_model=GroundedAnswer)
+def search_knowledge(
+    body: McpKnowledgeSearchRequest,
+    response: Response,
+    db: Session = Depends(get_db),
+    client: McpClientContext = Depends(require_mcp_service_token),
+    correlation_id: str = Depends(get_correlation_id),
+) -> GroundedAnswer:
+    provider = get_knowledge_provider()
+    answer = provider.ask(body.question, correlation_id, language=body.locale)
+    source_count_available = len(answer.sources)
+    answer.sources = answer.sources[: body.max_sources]
+    _set_trace_headers(response, correlation_id, client.tenant)
+    response.headers["X-Sources-Available"] = str(source_count_available)
+    response.headers["X-Sources-Returned"] = str(len(answer.sources))
+    _audit_service_request(
+        db,
+        reported_client_id=client.reported_client_id,
+        tool="fleet_ops_search_knowledge",
+        status_label=answer.evidence_state,
+        correlation_id=correlation_id,
+        metadata={
+            "tenant": client.tenant,
+            "locale": body.locale,
+            "sources_available": source_count_available,
+            "sources_returned": len(answer.sources),
+        },
+    )
+    return answer

backend/app/api/routers/observability.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import hmac
+
+from fastapi import APIRouter, Header, HTTPException
+from fastapi.responses import Response
+from prometheus_client import CONTENT_TYPE_LATEST, generate_latest
+from sqlalchemy import func, select
+
+from app.core.config import get_settings
+from app.core.db import SessionLocal
+from app.core.observability import OUTBOX_EVENTS
+from app.models.outbox import DELIVERY_STATUSES, DEMO_SCENARIO_ERROR_CODE, OutboxEvent
+
+router = APIRouter(tags=["observability"])
+settings = get_settings()
+
+
+def _refresh_database_metrics() -> None:
+    with SessionLocal() as db:
+        rows = db.execute(
+            select(
+                OutboxEvent.delivery_status,
+                (OutboxEvent.last_error_code == DEMO_SCENARIO_ERROR_CODE).label("demo"),
+                func.count(),
+            ).group_by(OutboxEvent.delivery_status, "demo")
+        ).all()
+    OUTBOX_EVENTS.clear()
+    # Keep every time series present even when a state currently contains no rows.
+    # Stable zero-valued series make dashboards and alerts deterministic after resets,
+    # restores and fresh installations instead of turning "zero" into "no data".
+    for scenario in ("synthetic", "operational"):
+        for status in DELIVERY_STATUSES:
+            OUTBOX_EVENTS.labels(scenario, status).set(0)
+    for status, is_demo, count in rows:
+        OUTBOX_EVENTS.labels("synthetic" if is_demo else "operational", str(status)).set(count)
+
+
+@router.get("/metrics", include_in_schema=False)
+def metrics(authorization: str | None = Header(default=None)) -> Response:
+    if settings.metrics_bearer_token:
+        supplied = authorization.removeprefix("Bearer ") if authorization else ""
+        if not hmac.compare_digest(supplied, settings.metrics_bearer_token):
+            raise HTTPException(status_code=401, detail="Metrics token required")
+    _refresh_database_metrics()
+    return Response(content=generate_latest(), media_type=CONTENT_TYPE_LATEST)

backend/app/api/routers/privacy.py

@@ -0,0 +1,166 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime, timedelta
+
+from fastapi import APIRouter, Depends, HTTPException
+from fastapi.responses import JSONResponse
+from sqlalchemy import func, or_, select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_db, require_operations_manager
+from app.core.config import get_settings
+from app.models.booking import Booking
+from app.models.customer import Customer
+from app.schemas import (
+    CurrentUser,
+    CustomerAnonymizeRequest,
+    CustomerAnonymizeResult,
+    PrivacyRetentionOut,
+)
+from app.services.audit import record_audit_event
+
+router = APIRouter(prefix="/api/v1/privacy", tags=["privacy"])
+settings = get_settings()
+
+
+def _retention_cutoff() -> datetime:
+    return datetime.now(UTC) - timedelta(days=settings.privacy_minimum_booking_retention_days)
+
+
+def _customer_is_eligible(db: Session, customer_id) -> bool:
+    blocking = db.scalar(
+        select(func.count())
+        .select_from(Booking)
+        .where(
+            Booking.customer_id == customer_id,
+            or_(
+                Booking.status.in_(("reserved", "active")),
+                Booking.ends_at > _retention_cutoff(),
+            ),
+        )
+    )
+    return not blocking
+
+
+@router.get("/retention", response_model=PrivacyRetentionOut)
+def retention_status(
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(require_operations_manager),
+) -> PrivacyRetentionOut:
+    customers = db.scalars(select(Customer)).all()
+    return PrivacyRetentionOut(
+        minimum_booking_retention_days=settings.privacy_minimum_booking_retention_days,
+        audit_retention_days=settings.privacy_audit_retention_days,
+        customers_total=len(customers),
+        customers_anonymized=sum(customer.anonymized_at is not None for customer in customers),
+        customers_eligible=sum(
+            customer.anonymized_at is None and _customer_is_eligible(db, customer.id)
+            for customer in customers
+        ),
+    )
+
+
+@router.get("/customers/{public_ref}/export")
+def export_customer_data(
+    public_ref: str,
+    db: Session = Depends(get_db),
+    actor: CurrentUser = Depends(require_operations_manager),
+) -> JSONResponse:
+    customer = db.scalar(select(Customer).where(Customer.public_ref == public_ref))
+    if customer is None:
+        raise HTTPException(status_code=404, detail="Customer not found")
+    bookings = db.scalars(
+        select(Booking).where(Booking.customer_id == customer.id).order_by(Booking.starts_at)
+    ).all()
+    payload = {
+        "generated_at": datetime.now(UTC).isoformat(),
+        "customer": {
+            "public_ref": customer.public_ref,
+            "first_name": customer.first_name,
+            "last_name": customer.last_name,
+            "email": customer.email,
+            "phone": customer.phone,
+            "postal_code": customer.postal_code,
+            "city": customer.city,
+            "date_of_birth": customer.date_of_birth.isoformat() if customer.date_of_birth else None,
+            "anonymized_at": customer.anonymized_at.isoformat() if customer.anonymized_at else None,
+        },
+        "bookings": [
+            {
+                "public_ref": booking.public_ref,
+                "starts_at": booking.starts_at.isoformat(),
+                "ends_at": booking.ends_at.isoformat(),
+                "status": booking.status,
+            }
+            for booking in bookings
+        ],
+    }
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="privacy_customer_exported",
+        entity_type="customer",
+        entity_id=customer.id,
+        metadata={"customer_ref": customer.public_ref, "booking_count": len(bookings)},
+    )
+    db.commit()
+    return JSONResponse(
+        payload,
+        headers={"Content-Disposition": f'attachment; filename="{public_ref}-privacy.json"'},
+    )
+
+
+@router.post("/customers/{public_ref}/anonymize", response_model=CustomerAnonymizeResult)
+def anonymize_customer(
+    public_ref: str,
+    body: CustomerAnonymizeRequest,
+    db: Session = Depends(get_db),
+    actor: CurrentUser = Depends(require_operations_manager),
+) -> CustomerAnonymizeResult:
+    customer = db.scalar(
+        select(Customer).where(Customer.public_ref == public_ref).with_for_update()
+    )
+    if customer is None:
+        raise HTTPException(status_code=404, detail="Customer not found")
+    if body.confirmation != public_ref:
+        raise HTTPException(
+            status_code=422, detail="Customer reference confirmation does not match"
+        )
+    if customer.anonymized_at is not None:
+        return CustomerAnonymizeResult(
+            public_ref=public_ref,
+            anonymized_at=customer.anonymized_at,
+            status="already_anonymized",
+        )
+    if not _customer_is_eligible(db, customer.id):
+        raise HTTPException(
+            status_code=409,
+            detail="Customer has an active/recent booking within the minimum retention period",
+        )
+    anonymized_at = datetime.now(UTC)
+    customer.first_name = "Anoniem"
+    customer.last_name = public_ref
+    customer.email = None
+    customer.phone = None
+    customer.postal_code = None
+    customer.city = None
+    customer.date_of_birth = None
+    customer.anonymized_at = anonymized_at
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="privacy_customer_anonymized",
+        entity_type="customer",
+        entity_id=customer.id,
+        before={"anonymized": False},
+        after={"anonymized": True},
+        metadata={"reason": body.reason, "customer_ref": public_ref},
+    )
+    db.commit()
+    return CustomerAnonymizeResult(
+        public_ref=public_ref,
+        anonymized_at=anonymized_at,
+        status="anonymized",
+    )

backend/app/api/routers/search.py

@@ -0,0 +1,184 @@
+from __future__ import annotations
+
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy import or_, select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user, get_db
+from app.models.booking import Booking
+from app.models.data_quality import DataQualityIssue
+from app.models.vehicle import Vehicle
+from app.schemas import CurrentUser, SearchResponse, SearchResultItem
+
+router = APIRouter(prefix="/api/v1/search", tags=["search"])
+
+# Static application sections. `id` is a stable code matching navigation.json's
+# `items.*` keys -- the frontend localizes both the section label and its one-line
+# detail from `id`, so no English prose is sent over the wire (search.sections.<id> in
+# every locale; see docs/fleet-ops-correction/i18n-inventory.md). Manager-only sections
+# are filtered by role, mirroring the same nav visibility rule Layout.tsx applies --
+# search must never surface a destination the current role can't actually reach.
+_SECTIONS: list[dict] = [
+    {
+        "id": "overview",
+        "link": "/dashboard",
+        # Search terms deliberately span all three supported UI languages (not just
+        # English) so a query never depends on the operator's selected locale.
+        "terms": ["overview", "dashboard", "readiness", "overzicht", "aperçu", "tableau de bord"],
+    },
+    {
+        "id": "fleet",
+        "link": "/vehicles",
+        "terms": ["fleet", "vehicle", "vehicles", "wagenpark", "voertuig", "flotte", "véhicule"],
+    },
+    {
+        "id": "bookings",
+        "link": "/bookings",
+        "terms": [
+            "booking",
+            "bookings",
+            "rental",
+            "boeking",
+            "boekingen",
+            "verhuur",
+            "réservation",
+            "réservations",
+            "location",
+        ],
+    },
+    {
+        "id": "quality",
+        "link": "/data-quality",
+        "terms": [
+            "quality",
+            "data quality",
+            "issues",
+            "kwaliteit",
+            "datakwaliteit",
+            "problemen",
+            "qualité",
+            "problèmes",
+        ],
+        "role": "operations_manager",
+    },
+    {
+        "id": "knowledge",
+        "link": "/knowledge",
+        "terms": ["knowledge", "procedures", "kennis", "procedures", "connaissances", "procédures"],
+    },
+    {
+        "id": "integrations",
+        "link": "/automation",
+        "terms": [
+            "automation",
+            "integrations",
+            "systems",
+            "n8n",
+            "automatisering",
+            "integraties",
+            "systemen",
+            "automatisation",
+            "intégrations",
+            "systèmes",
+        ],
+        "role": "operations_manager",
+    },
+    {
+        "id": "audit",
+        "link": "/audit",
+        "terms": ["audit", "history", "geschiedenis", "historique"],
+        "role": "operations_manager",
+    },
+    {
+        "id": "privacy",
+        "link": "/privacy",
+        "terms": ["privacy", "retention", "anonymise", "anonimiseren", "confidentialité"],
+        "role": "operations_manager",
+    },
+]
+
+
+@router.get("", response_model=SearchResponse)
+def search(
+    q: str = Query(min_length=1, max_length=100),
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> SearchResponse:
+    query = q.strip()
+    normalized = query.lower()
+    results: list[SearchResultItem] = []
+
+    for section in _SECTIONS:
+        role = section.get("role")
+        if role and user.role != role:
+            continue
+        terms: list[str] = section["terms"]
+        if any(term in normalized or normalized in term for term in terms):
+            results.append(
+                SearchResultItem(
+                    type="section",
+                    label=section["id"],
+                    detail_code=section["id"],
+                    link=section["link"],
+                )
+            )
+
+    like = f"%{query}%"
+    for v in db.scalars(
+        select(Vehicle)
+        .where(
+            or_(
+                Vehicle.public_ref.ilike(like),
+                Vehicle.make.ilike(like),
+                Vehicle.model.ilike(like),
+                Vehicle.registration_number.ilike(like),
+                Vehicle.location.ilike(like),
+            )
+        )
+        .order_by(Vehicle.public_ref)
+        .limit(5)
+    ).all():
+        results.append(
+            SearchResultItem(
+                type="vehicle",
+                label=v.public_ref,
+                detail_code="vehicleSummary",
+                detail_params={"make": v.make, "model": v.model, "location": v.location},
+                link=f"/vehicles/{v.public_ref}",
+            )
+        )
+
+    for b in db.scalars(
+        select(Booking)
+        .where(Booking.public_ref.ilike(like))
+        .order_by(Booking.starts_at.desc())
+        .limit(5)
+    ).all():
+        results.append(
+            SearchResultItem(
+                type="booking",
+                label=b.public_ref,
+                detail_code=b.status,
+                link=f"/bookings/{b.public_ref}",
+            )
+        )
+
+    # No customer detail route exists in this proof of concept, so customers are
+    # deliberately never returned here -- there is nowhere useful to send the user.
+    if user.role == "operations_manager":
+        for i in db.scalars(
+            select(DataQualityIssue)
+            .where(DataQualityIssue.public_ref.ilike(like))
+            .order_by(DataQualityIssue.detected_at.desc())
+            .limit(5)
+        ).all():
+            results.append(
+                SearchResultItem(
+                    type="data_quality_issue",
+                    label=i.public_ref,
+                    detail_code=i.rule_type,
+                    link=f"/data-quality/{i.public_ref}",
+                )
+            )
+
+    return SearchResponse(query=query, results=results[:10])

backend/app/api/routers/users.py

@@ -0,0 +1,100 @@
+import uuid
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_db, require_operations_manager
+from app.core.security import hash_password
+from app.models.user import User
+from app.schemas import CreateUserRequest, CurrentUser, UpdateUserRequest, UserOut
+from app.services.audit import record_audit_event
+
+router = APIRouter(prefix="/api/v1/users", tags=["users"])
+
+
+def _to_out(user: User) -> UserOut:
+    return UserOut(
+        public_ref=user.public_ref,
+        email=user.email,
+        display_name=user.display_name,
+        role=user.role,  # type: ignore[arg-type]
+        active=user.active,
+    )
+
+
+@router.get("", response_model=list[UserOut])
+def list_users(
+    db: Session = Depends(get_db),
+    _manager: CurrentUser = Depends(require_operations_manager),
+) -> list[UserOut]:
+    return [_to_out(user) for user in db.scalars(select(User).order_by(User.display_name)).all()]
+
+
+@router.post("", response_model=UserOut, status_code=201)
+def create_user(
+    body: CreateUserRequest,
+    db: Session = Depends(get_db),
+    manager: CurrentUser = Depends(require_operations_manager),
+) -> UserOut:
+    email = body.email.strip().lower()
+    if db.scalar(select(User.id).where(User.email == email)) is not None:
+        raise HTTPException(status_code=409, detail="A user with this email already exists")
+    user = User(
+        public_ref=f"USR-{uuid.uuid4().hex[:8].upper()}",
+        email=email,
+        password_hash=hash_password(body.password),
+        display_name=body.display_name.strip(),
+        role=body.role,
+        active=True,
+    )
+    db.add(user)
+    db.flush()
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=manager.display_name,
+        action="user_created",
+        entity_type="user",
+        entity_id=user.id,
+        after={"public_ref": user.public_ref, "role": user.role, "active": user.active},
+    )
+    db.commit()
+    return _to_out(user)
+
+
+@router.patch("/{public_ref}", response_model=UserOut)
+def update_user(
+    public_ref: str,
+    body: UpdateUserRequest,
+    db: Session = Depends(get_db),
+    manager: CurrentUser = Depends(require_operations_manager),
+) -> UserOut:
+    user = db.scalar(select(User).where(User.public_ref == public_ref).with_for_update())
+    if user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    if user.public_ref == manager.public_ref and body.active is False:
+        raise HTTPException(status_code=409, detail="You cannot deactivate your own account")
+    if user.public_ref == manager.public_ref and body.role not in (None, "operations_manager"):
+        raise HTTPException(status_code=409, detail="You cannot remove your own manager role")
+    before = {"display_name": user.display_name, "role": user.role, "active": user.active}
+    if body.display_name is not None:
+        user.display_name = body.display_name.strip()
+    if body.role is not None:
+        user.role = body.role
+    if body.active is not None:
+        user.active = body.active
+    if body.password is not None:
+        user.password_hash = hash_password(body.password)
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=manager.display_name,
+        action="user_updated",
+        entity_type="user",
+        entity_id=user.id,
+        before=before,
+        after={"display_name": user.display_name, "role": user.role, "active": user.active},
+    )
+    db.commit()
+    return _to_out(user)

backend/app/api/routers/vehicles.py

@@ -0,0 +1,408 @@
+from __future__ import annotations
+
+import uuid
+from datetime import UTC, datetime
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy import func, or_, select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_current_user, get_db, require_operations_manager
+from app.models.booking import Booking
+from app.models.customer import Customer
+from app.models.data_quality import DataQualityIssue
+from app.models.inspection import Inspection
+from app.models.maintenance import MaintenanceRecord
+from app.models.vehicle import Vehicle
+from app.schemas import (
+    BookingSummaryOut,
+    CreateMaintenanceRequest,
+    CurrentUser,
+    DataQualityIssueOut,
+    InspectionOut,
+    MaintenanceOut,
+    ReleaseVehicleRequest,
+    VehicleDetailOut,
+    VehicleOut,
+    VehiclePageOut,
+)
+from app.services.audit import record_audit_event
+from app.services.data_quality import open_odometer_regression_issue
+
+router = APIRouter(prefix="/api/v1/vehicles", tags=["vehicles"])
+
+
+def _attention_vehicle_ids(db: Session) -> set:
+    rows = db.scalars(
+        select(DataQualityIssue.entity_id).where(
+            DataQualityIssue.entity_type == "vehicle",
+            DataQualityIssue.status == "open",
+        )
+    ).all()
+    return set(rows)
+
+
+@router.get("", response_model=list[VehicleOut] | VehiclePageOut)
+def list_vehicles(
+    status: str | None = Query(default=None),
+    attention_only: bool = Query(default=False),
+    location: str | None = Query(default=None, min_length=1, max_length=120),
+    query: str | None = Query(default=None, min_length=1, max_length=100),
+    page: int | None = Query(default=None, ge=1),
+    page_size: int = Query(default=25, ge=1, le=25),
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(get_current_user),
+) -> list[VehicleOut] | VehiclePageOut:
+    stmt = select(Vehicle).order_by(Vehicle.public_ref)
+    if status:
+        stmt = stmt.where(Vehicle.operational_status == status)
+    if location:
+        stmt = stmt.where(Vehicle.location.ilike(location.strip()))
+    if query:
+        term = f"%{query.strip()}%"
+        stmt = stmt.where(
+            or_(
+                Vehicle.public_ref.ilike(term),
+                Vehicle.make.ilike(term),
+                Vehicle.model.ilike(term),
+                Vehicle.location.ilike(term),
+                Vehicle.registration_number.ilike(term),
+            )
+        )
+    attention_ids = _attention_vehicle_ids(db)
+    if attention_only:
+        stmt = stmt.where(
+            or_(
+                Vehicle.id.in_(attention_ids),
+                Vehicle.operational_status == "blocked",
+                Vehicle.next_service_km <= Vehicle.odometer_km,
+            )
+        )
+    total = db.scalar(select(func.count()).select_from(stmt.subquery())) or 0
+    page_number = page or 1
+    vehicles = db.scalars(
+        stmt if page is None else stmt.offset((page_number - 1) * page_size).limit(page_size)
+    ).all()
+    vehicle_ids = [vehicle.id for vehicle in vehicles]
+    next_bookings: dict[uuid.UUID, Booking] = {}
+    if vehicle_ids:
+        for booking in db.scalars(
+            select(Booking)
+            .where(
+                Booking.vehicle_id.in_(vehicle_ids),
+                Booking.status == "reserved",
+                Booking.starts_at >= datetime.now(UTC),
+            )
+            .order_by(Booking.starts_at.asc())
+        ).all():
+            next_bookings.setdefault(booking.vehicle_id, booking)
+    items = [
+        VehicleOut(
+            public_ref=v.public_ref,
+            make=v.make,
+            model=v.model,
+            model_year=v.model_year,
+            registration_number=v.registration_number,
+            location=v.location,
+            operational_status=v.operational_status,
+            odometer_km=v.odometer_km,
+            next_service_km=v.next_service_km,
+            active=v.active,
+            attention=(
+                v.id in attention_ids
+                or v.operational_status == "blocked"
+                or v.next_service_km <= v.odometer_km
+            ),
+            attention_reason=(
+                "blocked_status"
+                if v.operational_status == "blocked"
+                else "service_due"
+                if v.next_service_km <= v.odometer_km
+                else "data_quality"
+                if v.id in attention_ids
+                else None
+            ),
+            service_remaining_km=v.next_service_km - v.odometer_km,
+            next_booking_ref=(next_bookings[v.id].public_ref if v.id in next_bookings else None),
+            next_booking_at=(next_bookings[v.id].starts_at if v.id in next_bookings else None),
+        )
+        for v in vehicles
+    ]
+    if page is None:
+        return items
+    total_pages = max(1, (total + page_size - 1) // page_size)
+    return VehiclePageOut(
+        items=items,
+        page=min(page_number, total_pages),
+        page_size=page_size,
+        total=total,
+        total_pages=total_pages,
+    )
+
+
+@router.get("/{public_ref}", response_model=VehicleDetailOut)
+def get_vehicle(
+    public_ref: str,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(get_current_user),
+) -> VehicleDetailOut:
+    vehicle = db.scalar(select(Vehicle).where(Vehicle.public_ref == public_ref))
+    if vehicle is None:
+        raise HTTPException(status_code=404, detail="Vehicle not found")
+
+    bookings = db.scalars(
+        select(Booking).where(Booking.vehicle_id == vehicle.id).order_by(Booking.starts_at.desc())
+    ).all()
+    customer_ref_by_id = {c.id: c.public_ref for c in db.scalars(select(Customer)).all()}
+    inspections = db.scalars(
+        select(Inspection)
+        .where(Inspection.vehicle_id == vehicle.id)
+        .order_by(Inspection.completed_at.desc())
+    ).all()
+    maintenance = db.scalars(
+        select(MaintenanceRecord)
+        .where(MaintenanceRecord.vehicle_id == vehicle.id)
+        .order_by(MaintenanceRecord.occurred_at.desc())
+    ).all()
+    # Detailed data-quality evidence is an operations-manager surface. Employees still
+    # get the operational vehicle record they need, but never receive hidden evidence in
+    # the payload merely because the frontend omits the Quality tab.
+    issues = (
+        db.scalars(
+            select(DataQualityIssue)
+            .where(
+                DataQualityIssue.entity_type == "vehicle",
+                DataQualityIssue.entity_id == vehicle.id,
+            )
+            .order_by(DataQualityIssue.detected_at.desc())
+        ).all()
+        if user.role == "operations_manager"
+        else []
+    )
+
+    booking_by_id = {b.id: b.public_ref for b in bookings}
+    next_booking = next(
+        (
+            booking
+            for booking in sorted(bookings, key=lambda item: item.starts_at)
+            if booking.status == "reserved" and booking.starts_at >= datetime.now(UTC)
+        ),
+        None,
+    )
+
+    attention_ids = _attention_vehicle_ids(db)
+    return VehicleDetailOut(
+        public_ref=vehicle.public_ref,
+        make=vehicle.make,
+        model=vehicle.model,
+        model_year=vehicle.model_year,
+        registration_number=vehicle.registration_number,
+        location=vehicle.location,
+        operational_status=vehicle.operational_status,
+        odometer_km=vehicle.odometer_km,
+        next_service_km=vehicle.next_service_km,
+        active=vehicle.active,
+        attention=(
+            vehicle.id in attention_ids
+            or vehicle.operational_status == "blocked"
+            or vehicle.next_service_km <= vehicle.odometer_km
+        ),
+        attention_reason=(
+            "blocked_status"
+            if vehicle.operational_status == "blocked"
+            else "service_due"
+            if vehicle.next_service_km <= vehicle.odometer_km
+            else "data_quality"
+            if vehicle.id in attention_ids
+            else None
+        ),
+        service_remaining_km=vehicle.next_service_km - vehicle.odometer_km,
+        next_booking_ref=next_booking.public_ref if next_booking else None,
+        next_booking_at=next_booking.starts_at if next_booking else None,
+        bookings=[
+            BookingSummaryOut(
+                public_ref=b.public_ref,
+                customer_ref=customer_ref_by_id.get(b.customer_id, ""),
+                vehicle_ref=vehicle.public_ref,
+                starts_at=b.starts_at,
+                ends_at=b.ends_at,
+                status=b.status,
+            )
+            for b in bookings
+        ],
+        inspections=[
+            InspectionOut(
+                public_ref=i.public_ref,
+                booking_ref=booking_by_id.get(i.booking_id, ""),
+                type=i.type,
+                fuel_level_percent=i.fuel_level_percent,
+                cleanliness_ok=i.cleanliness_ok,
+                damage_reported=i.damage_reported,
+                technical_warning=i.technical_warning,
+                odometer_km=i.odometer_km,
+                completed_at=i.completed_at,
+            )
+            for i in inspections
+        ],
+        maintenance=[
+            MaintenanceOut(
+                public_ref=m.public_ref,
+                occurred_at=m.occurred_at,
+                odometer_km=m.odometer_km,
+                category=m.category,
+                summary=m.summary,
+            )
+            for m in maintenance
+        ],
+        quality_issues=[
+            DataQualityIssueOut(
+                public_ref=q.public_ref,
+                rule_type=q.rule_type,
+                entity_type=q.entity_type,
+                entity_ref=vehicle.public_ref,
+                severity=q.severity,
+                status=q.status,
+                evidence=q.evidence_json,
+                detected_at=q.detected_at,
+                due_at=q.due_at,
+                assigned_to_ref=(q.assigned_to_user.public_ref if q.assigned_to_user else None),
+                assigned_to_name=(q.assigned_to_user.display_name if q.assigned_to_user else None),
+                overdue=(
+                    q.status == "open" and q.due_at is not None and q.due_at < datetime.now(UTC)
+                ),
+                resolved_at=q.resolved_at,
+            )
+            for q in issues
+        ],
+    )
+
+
+@router.post("/{public_ref}/maintenance", response_model=MaintenanceOut, status_code=201)
+def create_maintenance_record(
+    public_ref: str,
+    body: CreateMaintenanceRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> MaintenanceOut:
+    vehicle = db.scalar(select(Vehicle).where(Vehicle.public_ref == public_ref).with_for_update())
+    if vehicle is None:
+        raise HTTPException(status_code=404, detail="Vehicle not found")
+    correlation_id = uuid.uuid4()
+    before_vehicle = {
+        "operational_status": vehicle.operational_status,
+        "odometer_km": vehicle.odometer_km,
+        "next_service_km": vehicle.next_service_km,
+    }
+    record = MaintenanceRecord(
+        public_ref=f"MAINT-{uuid.uuid4().hex[:8].upper()}",
+        vehicle_id=vehicle.id,
+        occurred_at=body.occurred_at,
+        odometer_km=body.odometer_km,
+        category=body.category,
+        summary=body.summary.strip(),
+    )
+    db.add(record)
+    open_odometer_regression_issue(
+        db,
+        vehicle=vehicle,
+        reading_ref=record.public_ref,
+        reading_km=body.odometer_km,
+        canonical_km=vehicle.odometer_km,
+        source_type="maintenance",
+        related_refs=[record.public_ref],
+        actor_label=user.display_name,
+        correlation_id=correlation_id,
+    )
+    vehicle.odometer_km = max(vehicle.odometer_km, body.odometer_km)
+    if body.next_service_km is not None:
+        if body.next_service_km < vehicle.odometer_km:
+            raise HTTPException(status_code=422, detail="Next service must not be below odometer")
+        vehicle.next_service_km = body.next_service_km
+    if body.mark_maintenance:
+        vehicle.operational_status = "maintenance"
+    vehicle.version += 1
+    db.flush()
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=user.display_name,
+        action="maintenance_record_created",
+        entity_type="vehicle",
+        entity_id=vehicle.id,
+        correlation_id=correlation_id,
+        before=before_vehicle,
+        after={
+            "maintenance_ref": record.public_ref,
+            "operational_status": vehicle.operational_status,
+            "odometer_km": vehicle.odometer_km,
+            "next_service_km": vehicle.next_service_km,
+        },
+    )
+    db.commit()
+    return MaintenanceOut(
+        public_ref=record.public_ref,
+        occurred_at=record.occurred_at,
+        odometer_km=record.odometer_km,
+        category=record.category,
+        summary=record.summary,
+    )
+
+
+@router.post("/{public_ref}/release", response_model=VehicleOut)
+def release_vehicle(
+    public_ref: str,
+    body: ReleaseVehicleRequest,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> VehicleOut:
+    vehicle = db.scalar(select(Vehicle).where(Vehicle.public_ref == public_ref).with_for_update())
+    if vehicle is None:
+        raise HTTPException(status_code=404, detail="Vehicle not found")
+    if vehicle.operational_status not in {"cleaning", "maintenance", "blocked"}:
+        raise HTTPException(status_code=409, detail="Vehicle does not require release")
+    active_booking = db.scalar(
+        select(Booking.id).where(Booking.vehicle_id == vehicle.id, Booking.status == "active")
+    )
+    open_high_issue = db.scalar(
+        select(DataQualityIssue.id).where(
+            DataQualityIssue.entity_type == "vehicle",
+            DataQualityIssue.entity_id == vehicle.id,
+            DataQualityIssue.status == "open",
+            DataQualityIssue.severity == "high",
+        )
+    )
+    if active_booking is not None or open_high_issue is not None:
+        raise HTTPException(status_code=409, detail="Vehicle still has a blocking condition")
+    before = {"status": vehicle.operational_status}
+    vehicle.operational_status = "available"
+    vehicle.version += 1
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=user.display_name,
+        action="vehicle_released",
+        entity_type="vehicle",
+        entity_id=vehicle.id,
+        before=before,
+        after={"status": "available", "reason": body.reason.strip()},
+    )
+    db.commit()
+    return VehicleOut(
+        public_ref=vehicle.public_ref,
+        make=vehicle.make,
+        model=vehicle.model,
+        model_year=vehicle.model_year,
+        registration_number=vehicle.registration_number,
+        location=vehicle.location,
+        operational_status=vehicle.operational_status,
+        odometer_km=vehicle.odometer_km,
+        next_service_km=vehicle.next_service_km,
+        active=vehicle.active,
+        attention=vehicle.next_service_km <= vehicle.odometer_km,
+        attention_reason=(
+            "service_due" if vehicle.next_service_km <= vehicle.odometer_km else None
+        ),
+        service_remaining_km=vehicle.next_service_km - vehicle.odometer_km,
+        next_booking_ref=None,
+        next_booking_at=None,
+    )

backend/app/api/routers/workflows.py

@@ -0,0 +1,90 @@
+from __future__ import annotations
+
+import uuid
+
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.api.deps import get_db, require_operations_manager
+from app.core.errors import AppError
+from app.models.outbox import OutboxEvent, is_demo_scenario_failure
+from app.schemas import AutomationRunOut, CurrentUser
+from app.services.audit import record_audit_event
+
+router = APIRouter(prefix="/api/v1/workflows", tags=["workflows"])
+
+
+def _to_out(event: OutboxEvent) -> AutomationRunOut:
+    return AutomationRunOut(
+        event_id=str(event.event_id),
+        event_type=event.event_type,
+        aggregate_ref=event.payload_json.get("aggregate_ref", ""),
+        status=event.delivery_status,
+        attempts=event.attempts,
+        last_error=event.last_error,
+        last_error_code=event.last_error_code,
+        is_demo_scenario=is_demo_scenario_failure(event),
+        occurred_at=event.occurred_at,
+    )
+
+
+@router.get("", response_model=list[AutomationRunOut])
+def list_workflows(
+    status: str | None = Query(default=None),
+    db: Session = Depends(get_db),
+    _user: CurrentUser = Depends(require_operations_manager),
+) -> list[AutomationRunOut]:
+    stmt = select(OutboxEvent).order_by(OutboxEvent.occurred_at.desc())
+    if status:
+        stmt = stmt.where(OutboxEvent.delivery_status == status)
+    events = db.scalars(stmt).all()
+    return [_to_out(e) for e in events]
+
+
+@router.post("/{event_id}/retry", response_model=AutomationRunOut)
+def retry_workflow(
+    event_id: str,
+    db: Session = Depends(get_db),
+    user: CurrentUser = Depends(require_operations_manager),
+) -> AutomationRunOut:
+    try:
+        parsed_id = uuid.UUID(event_id)
+    except ValueError as exc:
+        raise AppError("INVALID_EVENT_ID", "event_id must be a UUID.", status_code=422) from exc
+
+    event = db.scalar(select(OutboxEvent).where(OutboxEvent.event_id == parsed_id))
+    if event is None:
+        raise AppError("EVENT_NOT_FOUND", "Workflow event not found.", status_code=404)
+    if event.delivery_status != "failed":
+        raise AppError(
+            "NOT_RETRYABLE",
+            f"Event is '{event.delivery_status}', not 'failed'; "
+            "only failed deliveries can be retried.",
+            status_code=409,
+        )
+
+    # Captured before the status flips, so the audit records what was actually retried.
+    was_demo_scenario = is_demo_scenario_failure(event)
+
+    event.delivery_status = "pending"
+    event.next_attempt_at = None
+    # The retry itself is real either way: the event goes back on the outbox and the
+    # dispatcher delivers it to the configured n8n webhook like any other. The only
+    # difference recorded here is *what* was retried -- a staged demo failure or a real
+    # one -- so the audit trail never implies a production incident was resolved when a
+    # prop was.
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=user.display_name,
+        action="workflow_retry",
+        entity_type="outbox_event",
+        metadata={
+            "event_id": event_id,
+            "previous_attempts": event.attempts,
+            "demo_scenario": was_demo_scenario,
+        },
+    )
+    db.commit()
+    return _to_out(event)

backend/app/cli.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import argparse
+
+from app.core.db import SessionLocal
+from app.seed_loader import reset_and_seed
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(prog="app.cli")
+    subparsers = parser.add_subparsers(dest="command", required=True)
+
+    seed_parser = subparsers.add_parser("seed", help="Load the deterministic demo dataset")
+    seed_parser.add_argument(
+        "--reset", action="store_true", help="Clear existing data before loading"
+    )
+
+    args = parser.parse_args()
+
+    if args.command == "seed":
+        if not args.reset:
+            raise SystemExit(
+                "Only 'seed --reset' is supported: seeding always rebuilds the demo dataset."
+            )
+        db = SessionLocal()
+        try:
+            result = reset_and_seed(db)
+            for name, count in result.counts.items():
+                print(f"{name}: {count}")
+        finally:
+            db.close()
+
+
+if __name__ == "__main__":
+    main()

backend/app/core/config.py

@@ -0,0 +1,128 @@
+from functools import lru_cache
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+# The visible product name is fixed and never translated or configured per-deployment --
+# see docs/fleet-ops-correction/current-gap-audit.md section 1. Internal identifiers
+# (package name, Compose project, database name, repository) intentionally remain
+# "mobilityops"; this constant is only for user-facing surfaces (e.g. the OpenAPI title).
+PRODUCT_NAME = "Fleet Ops"
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file=".env", extra="ignore")
+
+    mobilityops_env: str = "development"
+    mobilityops_demo_mode: bool = True
+    database_url: str = "postgresql+psycopg://mobilityops:mobilityops@db:5432/mobilityops"
+    knowledge_provider: str = "demo"
+    ragcore_base_url: str = "http://ragcore-api:8000"
+    ragcore_tenant: str = "northstar-mobility-demo"
+    ragcore_workspace: str = "mobilityops"
+    ragcore_collection: str = "internal-procedures"
+    ragcore_api_token: str = ""
+    ragcore_space_id: str = ""
+    ragcore_http_timeout_seconds: float = 5.0
+    ragcore_answers_circuit_breaker_seconds: float = 60.0
+    # Search fallback is only labelled grounded above this explicit retrieval threshold.
+    # RAGcore's fused score is reciprocal-rank based (top ranks are ~1/61), so this
+    # accepts only leading results while still rejecting absent and low-ranked evidence.
+    ragcore_min_search_score: float = 0.016
+    n8n_webhook_url: str = "http://n8n:5678/webhook/mobilityops-return"
+    n8n_webhook_trigger_token: str = "replace-me-n8n-webhook-trigger-token"
+    n8n_callback_token: str = "replace-me-n8n-callback-token"
+    n8n_dispatch_enabled: bool = True
+    n8n_dispatch_interval_seconds: float = 3.0
+    # The synchronous n8n workflow performs two bounded, retried callbacks before it
+    # acknowledges an event. Keep this above that complete workflow budget, while the
+    # delivery lease remains the wider crash-recovery boundary (enforced by the contract
+    # check in scripts/check-contracts.py).
+    n8n_http_timeout_seconds: float = 15.0
+    n8n_max_attempts: int = 5
+    n8n_delivery_lease_seconds: float = 120.0
+    app_secret: str = "replace-in-production"
+    session_cookie_name: str = "mobilityops_session"
+    session_ttl_seconds: int = 60 * 60 * 8
+    session_cookie_secure: bool = False
+    seed_dir: str = "/app/seed"
+    knowledge_dir: str = "/app/knowledge/procedures"
+    mcp_hub_service_token: str = "replace-me-mcp-hub-token"
+    mcp_hub_registration_enabled: bool = False
+    # MCP Hub's own registration is catalog-driven on the Hub side (the Hub reconciles
+    # its catalog into the gateway; Fleet Ops never pushes a registration call), so
+    # these are only used for an honest reachability health check, not self-registration.
+    mcp_hub_base_url: str = ""
+    mcp_provider_id: str = "fleet-ops"
+    cors_allow_origins: str = "http://localhost:1228"
+    demo_organization_name: str = "Northstar Mobility"
+    demo_timezone: str = "Europe/Brussels"
+    demo_allow_reset: bool = True
+    demo_reset_cooldown_seconds: int = 60
+    mcp_hub_health_cache_seconds: int = 60
+    initial_admin_email: str = ""
+    initial_admin_password: str = ""
+    initial_admin_display_name: str = "Operations Manager"
+    mobilityops_public_url: str = "http://localhost:1228"
+    oidc_enabled: bool = False
+    oidc_provider_name: str = "Organisatieaccount"
+    oidc_issuer_url: str = ""
+    oidc_client_id: str = ""
+    oidc_client_secret: str = ""
+    oidc_redirect_uri: str = ""
+    oidc_allowed_email_domains: str = ""
+    oidc_auto_provision: bool = True
+    oidc_default_role: str = "rental_employee"
+    log_level: str = "INFO"
+    # Failed password logins per client IP before a temporary 429 (0 disables).
+    login_max_failures: int = 10
+    login_failure_window_seconds: int = 900
+    knowledge_max_requests: int = 30
+    knowledge_rate_limit_window_seconds: int = 60
+    metrics_bearer_token: str = ""
+    privacy_minimum_booking_retention_days: int = 30
+    privacy_audit_retention_days: int = 2555
+    privacy_audit_export_max_rows: int = 10000
+
+
+# Secrets that guard *inbound* trust (session cookies, service callbacks). Running
+# production with any of these at their placeholder value means forged sessions or
+# unauthenticated writes, so startup refuses.
+INSECURE_DEFAULT_SECRETS: tuple[tuple[str, str], ...] = (
+    ("app_secret", "replace-in-production"),
+    ("n8n_callback_token", "replace-me-n8n-callback-token"),
+    ("mcp_hub_service_token", "replace-me-mcp-hub-token"),
+)
+
+
+def insecure_default_secrets(settings: "Settings") -> list[str]:
+    """Return the names of secret settings that still carry their placeholder value.
+
+    MCP routes are always mounted, independently of the Hub reachability-status flag, so
+    their inbound token must always be non-placeholder in production.
+    """
+    insecure: list[str] = []
+    for name, placeholder in INSECURE_DEFAULT_SECRETS:
+        value = getattr(settings, name)
+        if not value or value == placeholder or value.startswith("replace-me"):
+            insecure.append(name)
+    return insecure
+
+
+@lru_cache
+def get_settings() -> Settings:
+    settings = Settings()
+    if settings.mobilityops_env.lower() == "production":
+        insecure = insecure_default_secrets(settings)
+        if insecure:
+            # Refuse to boot rather than run production with forgeable session cookies
+            # or guessable service tokens. Development/test/demo keep the defaults.
+            raise RuntimeError(
+                "Refusing to start in production with placeholder secrets: "
+                + ", ".join(insecure)
+                + ". Set real values in the environment (see .env.example)."
+            )
+        if not settings.mobilityops_public_url.lower().startswith("https://"):
+            raise RuntimeError("Production MOBILITYOPS_PUBLIC_URL must use HTTPS.")
+        if not settings.session_cookie_secure:
+            raise RuntimeError("Production SESSION_COOKIE_SECURE must be true.")
+    return settings

backend/app/core/db.py

@@ -0,0 +1,54 @@
+from collections.abc import Generator
+
+from sqlalchemy import create_engine, event, func, select
+from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
+
+from app.core.config import get_settings
+
+settings = get_settings()
+
+engine = create_engine(settings.database_url, pool_pre_ping=True, future=True)
+SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False, future=True)
+
+# Every SQLAlchemy transaction participates in a shared database-wide barrier. Normal
+# reads/writes coexist; the short demo reset takes the exclusive form so it can never
+# interleave deletes/inserts with an API request, scanner, callback, or dispatcher cycle.
+DEMO_DATA_BARRIER_LOCK_ID = 5_344_725_149_212_793_901
+_EXCLUSIVE_RESET_INFO_KEY = "mobilityops_demo_reset_exclusive"
+
+
+@event.listens_for(Session, "after_begin")
+def _acquire_demo_data_barrier(session: Session, _transaction, connection) -> None:
+    if connection.dialect.name != "postgresql":
+        return
+    lock = (
+        func.pg_advisory_xact_lock(DEMO_DATA_BARRIER_LOCK_ID)
+        if session.info.get(_EXCLUSIVE_RESET_INFO_KEY)
+        else func.pg_advisory_xact_lock_shared(DEMO_DATA_BARRIER_LOCK_ID)
+    )
+    connection.execute(select(lock))
+
+
+def begin_exclusive_demo_reset(db: Session) -> None:
+    """Make the session's next transaction the exclusive side of the reset barrier."""
+    if db.in_transaction():
+        # Auth normally already read the user under a shared barrier. End that read-only
+        # transaction before requesting exclusive; in-place lock upgrades can deadlock.
+        db.rollback()
+    db.info[_EXCLUSIVE_RESET_INFO_KEY] = True
+
+
+def end_exclusive_demo_reset(db: Session) -> None:
+    db.info.pop(_EXCLUSIVE_RESET_INFO_KEY, None)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+def get_db() -> Generator[Session, None, None]:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

backend/app/core/errors.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+import uuid
+from typing import Any
+
+
+class AppError(Exception):
+    def __init__(
+        self,
+        code: str,
+        message: str,
+        status_code: int = 400,
+        details: dict[str, Any] | None = None,
+    ) -> None:
+        super().__init__(message)
+        self.code = code
+        self.message = message
+        self.status_code = status_code
+        self.details = details or {}
+        self.correlation_id = str(uuid.uuid4())
+
+
+def error_body(code: str, message: str, correlation_id: str, details: dict[str, Any]) -> dict:
+    return {
+        "error": {
+            "code": code,
+            "message": message,
+            "correlation_id": correlation_id,
+            "details": details,
+        }
+    }

backend/app/core/observability.py

@@ -0,0 +1,113 @@
+from __future__ import annotations
+
+import json
+import logging
+import time
+import uuid
+from contextvars import ContextVar
+from datetime import UTC, datetime
+
+from fastapi import Request
+from prometheus_client import Counter, Gauge, Histogram
+
+correlation_id_context: ContextVar[str] = ContextVar("correlation_id", default="")
+
+HTTP_REQUESTS = Counter(
+    "mobilityops_http_requests_total",
+    "Completed MobilityOps HTTP requests.",
+    ("method", "route", "status"),
+)
+HTTP_DURATION = Histogram(
+    "mobilityops_http_request_duration_seconds",
+    "MobilityOps HTTP request duration.",
+    ("method", "route"),
+    buckets=(0.05, 0.1, 0.25, 0.5, 1, 2.5, 5, 10),
+)
+HTTP_IN_PROGRESS = Gauge(
+    "mobilityops_http_requests_in_progress",
+    "MobilityOps HTTP requests currently executing.",
+)
+OUTBOX_EVENTS = Gauge(
+    "mobilityops_outbox_events",
+    "Persisted outbox events by state and scenario type.",
+    ("scenario", "status"),
+)
+DATABASE_READY = Gauge(
+    "mobilityops_database_ready",
+    "Whether the canonical PostgreSQL database answered the most recent readiness probe.",
+)
+KNOWLEDGE_PROVIDER_REQUESTS = Counter(
+    "mobilityops_knowledge_provider_requests_total",
+    "RAGcore adapter requests by stage and outcome.",
+    ("stage", "outcome"),
+)
+KNOWLEDGE_RETRIEVAL_SCORE = Histogram(
+    "mobilityops_knowledge_retrieval_score",
+    "Observed RAGcore fused/rerank retrieval scores.",
+    buckets=(0.005, 0.01, 0.015, 0.016, 0.0162, 0.0164, 0.02, 0.05, 0.1, 0.5, 1.0),
+)
+
+
+class JsonFormatter(logging.Formatter):
+    def format(self, record: logging.LogRecord) -> str:
+        payload: dict[str, object] = {
+            "timestamp": datetime.now(UTC).isoformat(),
+            "level": record.levelname.lower(),
+            "logger": record.name,
+            "message": record.getMessage(),
+        }
+        correlation_id = correlation_id_context.get()
+        if correlation_id:
+            payload["correlation_id"] = correlation_id
+        for key in ("method", "path", "status_code", "duration_ms", "client_ip"):
+            value = getattr(record, key, None)
+            if value is not None:
+                payload[key] = value
+        if record.exc_info:
+            payload["exception"] = self.formatException(record.exc_info)
+        return json.dumps(payload, separators=(",", ":"), default=str)
+
+
+def configure_logging(level: str) -> None:
+    handler = logging.StreamHandler()
+    handler.setFormatter(JsonFormatter())
+    root = logging.getLogger()
+    root.handlers = [handler]
+    root.setLevel(level.upper())
+
+
+def correlation_id_for(request: Request) -> str:
+    candidate = request.headers.get("X-Correlation-Id", "").strip()
+    try:
+        return str(uuid.UUID(candidate)) if candidate else str(uuid.uuid4())
+    except ValueError:
+        return str(uuid.uuid4())
+
+
+UNMATCHED_ROUTE_LABEL = "<unmatched>"
+
+
+def route_label(request: Request) -> str:
+    """Return the route *template* for metrics labels.
+
+    Unmatched paths (404 probes, scanners) must not become their own label value:
+    every distinct URL would otherwise create a new Prometheus time series and the
+    metric cardinality would grow without bound.
+    """
+    route = request.scope.get("route")
+    path = getattr(route, "path", None)
+    return str(path) if path else UNMATCHED_ROUTE_LABEL
+
+
+def request_started() -> float:
+    HTTP_IN_PROGRESS.inc()
+    return time.perf_counter()
+
+
+def request_finished(request: Request, status_code: int, started_at: float) -> float:
+    duration = time.perf_counter() - started_at
+    route = route_label(request)
+    HTTP_REQUESTS.labels(request.method, route, str(status_code)).inc()
+    HTTP_DURATION.labels(request.method, route).observe(duration)
+    HTTP_IN_PROGRESS.dec()
+    return duration

backend/app/core/ratelimit.py

@@ -0,0 +1,72 @@
+"""Small in-process failed-attempt limiter for credential endpoints.
+
+Fleet Ops runs as a single API process per deployment, so an in-memory sliding window
+is sufficient to blunt online password guessing (and the scrypt CPU amplification that
+comes with it) without adding Redis. Only *failed* attempts count, so legitimate users
+and the automated test suite are never throttled.
+"""
+
+from __future__ import annotations
+
+import threading
+import time
+from collections import deque
+
+
+class FailedAttemptLimiter:
+    def __init__(self, *, max_failures: int, window_seconds: float) -> None:
+        self.max_failures = max_failures
+        self.window_seconds = window_seconds
+        self._failures: dict[str, deque[float]] = {}
+        self._lock = threading.Lock()
+
+    def _prune(self, key: str, now: float) -> deque[float]:
+        bucket = self._failures.setdefault(key, deque())
+        cutoff = now - self.window_seconds
+        while bucket and bucket[0] <= cutoff:
+            bucket.popleft()
+        if not bucket:
+            self._failures.pop(key, None)
+        return bucket
+
+    def retry_after_seconds(self, key: str) -> int:
+        """Return >0 seconds to wait when the key is currently blocked, else 0."""
+        now = time.monotonic()
+        with self._lock:
+            bucket = self._prune(key, now)
+            if len(bucket) < self.max_failures:
+                return 0
+            return max(1, int(bucket[0] + self.window_seconds - now + 0.999))
+
+    def record_failure(self, key: str) -> None:
+        now = time.monotonic()
+        with self._lock:
+            self._prune(key, now)
+            self._failures.setdefault(key, deque()).append(now)
+
+    def reset(self, key: str) -> None:
+        with self._lock:
+            self._failures.pop(key, None)
+
+
+class SlidingWindowLimiter:
+    """Thread-safe request limiter where every accepted request consumes capacity."""
+
+    def __init__(self, *, max_requests: int, window_seconds: float) -> None:
+        self.max_requests = max_requests
+        self.window_seconds = window_seconds
+        self._requests: dict[str, deque[float]] = {}
+        self._lock = threading.Lock()
+
+    def consume(self, key: str) -> int:
+        """Record an accepted request, or return the seconds until capacity is available."""
+        now = time.monotonic()
+        with self._lock:
+            bucket = self._requests.setdefault(key, deque())
+            cutoff = now - self.window_seconds
+            while bucket and bucket[0] <= cutoff:
+                bucket.popleft()
+            if len(bucket) >= self.max_requests:
+                return max(1, int(bucket[0] + self.window_seconds - now + 0.999))
+            bucket.append(now)
+            return 0

backend/app/core/security.py

@@ -0,0 +1,87 @@
+from __future__ import annotations
+
+import base64
+import hashlib
+import hmac
+import json
+import os
+import time
+from dataclasses import dataclass
+
+from app.core.config import get_settings
+
+settings = get_settings()
+
+
+@dataclass(frozen=True)
+class SessionPayload:
+    user_id: str
+    public_ref: str
+    role: str
+    display_name: str
+    issued_at: int
+    session_id: str = ""
+
+
+def _sign(data: bytes) -> str:
+    digest = hmac.new(settings.app_secret.encode(), data, hashlib.sha256).digest()
+    return base64.urlsafe_b64encode(digest).decode().rstrip("=")
+
+
+def session_token_hash(token: str) -> str:
+    """Return a non-reversible identifier safe to persist for token revocation."""
+    return hashlib.sha256(token.encode()).hexdigest()
+
+
+def create_session_token(payload: SessionPayload) -> str:
+    body = json.dumps(payload.__dict__, separators=(",", ":")).encode()
+    encoded_body = base64.urlsafe_b64encode(body).decode().rstrip("=")
+    signature = _sign(encoded_body.encode())
+    return f"{encoded_body}.{signature}"
+
+
+def read_session_token(token: str) -> SessionPayload | None:
+    try:
+        encoded_body, signature = token.split(".", 1)
+    except ValueError:
+        return None
+    expected = _sign(encoded_body.encode())
+    if not hmac.compare_digest(expected, signature):
+        return None
+    padding = "=" * (-len(encoded_body) % 4)
+    try:
+        body = json.loads(base64.urlsafe_b64decode(encoded_body + padding))
+    except (ValueError, json.JSONDecodeError):
+        return None
+    payload = SessionPayload(**body)
+    if time.time() - payload.issued_at > settings.session_ttl_seconds:
+        return None
+    return payload
+
+
+def hash_password(password: str) -> str:
+    salt = os.urandom(16)
+    derived = hashlib.scrypt(password.encode(), salt=salt, n=2**14, r=8, p=1, dklen=32)
+    encoded_salt = base64.urlsafe_b64encode(salt).decode()
+    encoded_hash = base64.urlsafe_b64encode(derived).decode()
+    return f"scrypt$16384$8$1${encoded_salt}${encoded_hash}"
+
+
+def verify_password(password: str, encoded: str | None) -> bool:
+    if not encoded:
+        return False
+    try:
+        algorithm, n, r, p, salt, expected = encoded.split("$")
+        if algorithm != "scrypt":
+            return False
+        derived = hashlib.scrypt(
+            password.encode(),
+            salt=base64.urlsafe_b64decode(salt.encode()),
+            n=int(n),
+            r=int(r),
+            p=int(p),
+            dklen=32,
+        )
+        return hmac.compare_digest(derived, base64.urlsafe_b64decode(expected.encode()))
+    except (ValueError, TypeError):
+        return False

backend/app/main.py

@@ -0,0 +1,201 @@
+import logging
+import uuid
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI, HTTPException, Request
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import JSONResponse
+from sqlalchemy import text
+from starlette.middleware.sessions import SessionMiddleware
+
+from app.api.routers import (
+    audit,
+    auth,
+    bookings,
+    customers,
+    dashboard,
+    data_quality,
+    demo,
+    integration_status,
+    integrations,
+    knowledge,
+    mcp_integrations,
+    observability,
+    privacy,
+    search,
+    users,
+    vehicles,
+    workflows,
+)
+from app.api.routers.auth import bootstrap_initial_admin
+from app.core.config import PRODUCT_NAME, get_settings
+from app.core.db import SessionLocal
+from app.core.errors import AppError, error_body
+from app.core.observability import (
+    DATABASE_READY,
+    configure_logging,
+    correlation_id_context,
+    correlation_id_for,
+    request_finished,
+    request_started,
+)
+from app.services.dispatcher import start_background_dispatcher, stop_background_dispatcher
+
+settings = get_settings()
+configure_logging(settings.log_level)
+request_logger = logging.getLogger("mobilityops.request")
+
+
+@asynccontextmanager
+async def lifespan(_app: FastAPI):
+    with SessionLocal() as db:
+        bootstrap_initial_admin(db)
+    start_background_dispatcher()
+    yield
+    stop_background_dispatcher()
+
+
+production = settings.mobilityops_env.lower() == "production"
+app = FastAPI(
+    title=f"{PRODUCT_NAME} API",
+    version="0.1.0",
+    description=(
+        "Generated contract for Fleet Ops. The visible product name is Fleet Ops; "
+        "MobilityOps remains the technical repository and service identifier."
+    ),
+    servers=[{"url": "http://localhost:8128"}],
+    lifespan=lifespan,
+    docs_url=None if production else "/docs",
+    redoc_url=None if production else "/redoc",
+    openapi_url=None if production else "/openapi.json",
+)
+
+app.add_middleware(
+    SessionMiddleware,
+    secret_key=settings.app_secret,
+    session_cookie="mobilityops_oidc_state",
+    max_age=600,
+    same_site="lax",
+    https_only=settings.session_cookie_secure,
+)
+
+
+@app.middleware("http")
+async def request_observability(request: Request, call_next):
+    correlation_id = correlation_id_for(request)
+    request.state.correlation_id = correlation_id
+    token = correlation_id_context.set(correlation_id)
+    started_at = request_started()
+    status_code = 500
+    try:
+        response = await call_next(request)
+        status_code = response.status_code
+        response.headers["X-Correlation-Id"] = correlation_id
+        return response
+    finally:
+        duration = request_finished(request, status_code, started_at)
+        request_logger.info(
+            "request_completed",
+            extra={
+                "method": request.method,
+                "path": request.url.path,
+                "status_code": status_code,
+                "duration_ms": round(duration * 1000, 2),
+                "client_ip": request.client.host if request.client else None,
+            },
+        )
+        correlation_id_context.reset(token)
+
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=[o.strip() for o in settings.cors_allow_origins.split(",")],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+@app.exception_handler(AppError)
+def handle_app_error(request: Request, exc: AppError) -> JSONResponse:
+    return JSONResponse(
+        status_code=exc.status_code,
+        content=error_body(
+            exc.code,
+            exc.message,
+            request.state.correlation_id,
+            exc.details,
+        ),
+    )
+
+
+@app.exception_handler(HTTPException)
+def handle_http_exception(request: Request, exc: HTTPException) -> JSONResponse:
+    return JSONResponse(
+        status_code=exc.status_code,
+        content=error_body(
+            code=str(exc.status_code),
+            message=str(exc.detail),
+            correlation_id=getattr(request.state, "correlation_id", str(uuid.uuid4())),
+            details={},
+        ),
+        headers=exc.headers,
+    )
+
+
+@app.get("/health")
+def health() -> dict[str, str]:
+    return {"status": "ok", "service": "mobilityops-api"}
+
+
+@app.get("/health/live")
+def liveness() -> dict[str, str]:
+    """Process liveness only; external dependencies deliberately do not affect it."""
+    return {"status": "ok", "service": "mobilityops-api"}
+
+
+@app.get("/health/ready")
+def readiness() -> JSONResponse:
+    """Traffic readiness: the API is useful only while its canonical database responds."""
+    try:
+        with SessionLocal() as db:
+            db.execute(text("SELECT 1"))
+    except Exception:  # noqa: BLE001 -- readiness must convert infrastructure errors to 503
+        DATABASE_READY.set(0)
+        return JSONResponse(
+            status_code=503,
+            content={"status": "not_ready", "service": "mobilityops-api", "database": "down"},
+        )
+    DATABASE_READY.set(1)
+    return JSONResponse(content={"status": "ready", "service": "mobilityops-api", "database": "up"})
+
+
+@app.get("/api/v1/system/status")
+def system_status() -> dict[str, object]:
+    return {
+        "service": "mobilityops-api",
+        "environment": settings.mobilityops_env,
+        "demo_mode": settings.mobilityops_demo_mode,
+        "knowledge_provider": settings.knowledge_provider,
+        "oidc_enabled": auth.oidc_status().enabled,
+        "oidc_provider_name": auth.oidc_status().provider_name,
+    }
+
+
+app.include_router(demo.router)
+app.include_router(auth.router)
+app.include_router(dashboard.router)
+app.include_router(vehicles.router)
+app.include_router(bookings.router)
+app.include_router(customers.router)
+app.include_router(audit.router)
+app.include_router(data_quality.router)
+app.include_router(workflows.router)
+app.include_router(integrations.router)
+app.include_router(knowledge.router)
+app.include_router(mcp_integrations.router)
+app.include_router(search.router)
+app.include_router(integration_status.router)
+app.include_router(users.router)
+app.include_router(observability.router)
+app.include_router(privacy.router)

backend/app/models/__init__.py

@@ -0,0 +1,27 @@
+from app.core.db import Base
+from app.models.audit import AuditEvent
+from app.models.booking import Booking
+from app.models.customer import Customer
+from app.models.data_quality import DataQualityIssue
+from app.models.idempotency import IdempotencyRecord
+from app.models.inspection import Inspection
+from app.models.maintenance import MaintenanceRecord
+from app.models.outbox import OutboxEvent
+from app.models.revoked_session import RevokedSession
+from app.models.user import User
+from app.models.vehicle import Vehicle
+
+__all__ = [
+    "Base",
+    "AuditEvent",
+    "Booking",
+    "Customer",
+    "DataQualityIssue",
+    "IdempotencyRecord",
+    "Inspection",
+    "MaintenanceRecord",
+    "OutboxEvent",
+    "RevokedSession",
+    "User",
+    "Vehicle",
+]

backend/app/models/audit.py

@@ -0,0 +1,32 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import CheckConstraint, DateTime, Index, String
+from sqlalchemy.dialects.postgresql import JSONB, UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import UUIDPrimaryKeyMixin
+
+ACTOR_TYPES = ("user", "service", "system")
+
+
+class AuditEvent(UUIDPrimaryKeyMixin, Base):
+    __tablename__ = "audit_events"
+    __table_args__ = (
+        CheckConstraint("actor_type IN ('user','service','system')", name="ck_audit_actor_type"),
+        Index("ix_audit_action_occurred", "action", "occurred_at"),
+        Index("ix_audit_entity", "entity_type", "entity_id"),
+    )
+
+    actor_type: Mapped[str] = mapped_column(String(20), nullable=False)
+    actor_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
+    actor_label: Mapped[str] = mapped_column(String(120), nullable=False)
+    action: Mapped[str] = mapped_column(String(80), nullable=False)
+    entity_type: Mapped[str] = mapped_column(String(30), nullable=False)
+    entity_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
+    correlation_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+    before_json: Mapped[dict | None] = mapped_column(JSONB)
+    after_json: Mapped[dict | None] = mapped_column(JSONB)
+    metadata_json: Mapped[dict | None] = mapped_column(JSONB)
+    occurred_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)

backend/app/models/booking.py

@@ -0,0 +1,45 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import Boolean, CheckConstraint, DateTime, ForeignKey, Index, Integer, String
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import TimestampMixin, UUIDPrimaryKeyMixin
+
+BOOKING_STATUSES = ("reserved", "active", "returned", "cancelled", "blocked")
+
+
+class Booking(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "bookings"
+    __table_args__ = (
+        CheckConstraint(
+            "status IN ('reserved','active','returned','cancelled','blocked')",
+            name="ck_bookings_status",
+        ),
+        CheckConstraint("ends_at > starts_at", name="ck_bookings_time_window"),
+        CheckConstraint(
+            "start_odometer_km IS NULL OR start_odometer_km >= 0",
+            name="ck_bookings_start_odometer",
+        ),
+        CheckConstraint(
+            "end_odometer_km IS NULL OR end_odometer_km >= 0",
+            name="ck_bookings_end_odometer",
+        ),
+        Index("ix_bookings_vehicle_status_window", "vehicle_id", "status", "starts_at", "ends_at"),
+    )
+
+    public_ref: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
+    customer_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("customers.id"), nullable=False
+    )
+    vehicle_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("vehicles.id"), nullable=False
+    )
+    starts_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    ends_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    status: Mapped[str] = mapped_column(String(20), nullable=False)
+    start_odometer_km: Mapped[int | None] = mapped_column(Integer)
+    end_odometer_km: Mapped[int | None] = mapped_column(Integer)
+    requirements_complete: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)

backend/app/models/customer.py

@@ -0,0 +1,26 @@
+import uuid
+from datetime import date, datetime
+
+from sqlalchemy import Date, DateTime, ForeignKey, String
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import TimestampMixin, UUIDPrimaryKeyMixin
+
+
+class Customer(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "customers"
+
+    public_ref: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
+    first_name: Mapped[str] = mapped_column(String(80), nullable=False)
+    last_name: Mapped[str] = mapped_column(String(80), nullable=False)
+    email: Mapped[str | None] = mapped_column(String(200))
+    phone: Mapped[str | None] = mapped_column(String(40))
+    postal_code: Mapped[str | None] = mapped_column(String(20))
+    city: Mapped[str | None] = mapped_column(String(120))
+    date_of_birth: Mapped[date | None] = mapped_column(Date)
+    merged_into_customer_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("customers.id")
+    )
+    anonymized_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), index=True)

backend/app/models/data_quality.py

@@ -0,0 +1,65 @@
+import uuid
+from datetime import datetime
+from typing import TYPE_CHECKING
+
+from sqlalchemy import CheckConstraint, DateTime, ForeignKey, Index, String, text
+from sqlalchemy.dialects.postgresql import JSONB, UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.db import Base
+from app.models.mixins import TimestampMixin, UUIDPrimaryKeyMixin
+
+if TYPE_CHECKING:
+    from app.models.user import User
+
+RULE_TYPES = (
+    "possible_duplicate_customer",
+    "missing_required_field",
+    "odometer_regression",
+    "booking_overlap",
+    "vehicle_status_conflict",
+)
+SEVERITIES = ("low", "medium", "high")
+ISSUE_STATUSES = ("open", "deferred", "resolved", "rejected")
+
+
+class DataQualityIssue(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "data_quality_issues"
+    __table_args__ = (
+        CheckConstraint(
+            "rule_type IN ('possible_duplicate_customer','missing_required_field',"
+            "'odometer_regression','booking_overlap','vehicle_status_conflict')",
+            name="ck_data_quality_rule_type",
+        ),
+        CheckConstraint("severity IN ('low','medium','high')", name="ck_data_quality_severity"),
+        CheckConstraint(
+            "status IN ('open','deferred','resolved','rejected')",
+            name="ck_data_quality_status",
+        ),
+        Index("ix_data_quality_work_queue", "status", "due_at", "severity"),
+        Index(
+            "uq_data_quality_one_open_condition",
+            "rule_type",
+            "entity_type",
+            "entity_id",
+            unique=True,
+            postgresql_where=text("status = 'open'"),
+        ),
+    )
+
+    public_ref: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
+    rule_type: Mapped[str] = mapped_column(String(40), nullable=False)
+    entity_type: Mapped[str] = mapped_column(String(30), nullable=False)
+    entity_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+    severity: Mapped[str] = mapped_column(String(10), nullable=False)
+    status: Mapped[str] = mapped_column(String(20), nullable=False, default="open")
+    evidence_json: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
+    proposed_action_json: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
+    detected_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    due_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), index=True)
+    assigned_to_user_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), index=True
+    )
+    assigned_to_user: Mapped["User | None"] = relationship(lazy="selectin")
+    resolved_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    resolved_by: Mapped[str | None] = mapped_column(String(120))

backend/app/models/idempotency.py

@@ -0,0 +1,22 @@
+import uuid
+
+from sqlalchemy import ForeignKey, Integer, String
+from sqlalchemy.dialects.postgresql import JSONB, UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import TimestampMixin, UUIDPrimaryKeyMixin
+
+
+class IdempotencyRecord(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "idempotency_records"
+
+    idempotency_key: Mapped[str] = mapped_column(String(128), unique=True, nullable=False)
+    booking_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("bookings.id"), nullable=False
+    )
+    # SHA-256 of the canonical request body. Replaying a key with a *different* body is
+    # a client bug and must be rejected instead of silently answered with the old result.
+    request_fingerprint: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    response_status: Mapped[int] = mapped_column(Integer, nullable=False)
+    response_body: Mapped[dict] = mapped_column(JSONB, nullable=False)

backend/app/models/inspection.py

@@ -0,0 +1,32 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Text
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import TimestampMixin, UUIDPrimaryKeyMixin
+
+INSPECTION_TYPES = ("checkout", "return")
+
+
+class Inspection(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "inspections"
+
+    public_ref: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
+    booking_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("bookings.id"), nullable=False
+    )
+    vehicle_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("vehicles.id"), nullable=False
+    )
+    type: Mapped[str] = mapped_column(String(20), nullable=False)
+    fuel_level_percent: Mapped[int] = mapped_column(Integer, nullable=False)
+    cleanliness_ok: Mapped[bool] = mapped_column(Boolean, nullable=False)
+    damage_reported: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+    technical_warning: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+    notes: Mapped[str | None] = mapped_column(Text)
+    odometer_km: Mapped[int] = mapped_column(Integer, nullable=False)
+    completed_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    completed_by: Mapped[str | None] = mapped_column(String(120))

backend/app/models/maintenance.py

@@ -0,0 +1,22 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, ForeignKey, Integer, String, Text
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import UUIDPrimaryKeyMixin
+
+
+class MaintenanceRecord(UUIDPrimaryKeyMixin, Base):
+    __tablename__ = "maintenance_records"
+
+    public_ref: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
+    vehicle_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("vehicles.id"), nullable=False
+    )
+    occurred_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    odometer_km: Mapped[int] = mapped_column(Integer, nullable=False)
+    category: Mapped[str] = mapped_column(String(60), nullable=False)
+    summary: Mapped[str] = mapped_column(Text, nullable=False)

backend/app/models/mixins.py

@@ -0,0 +1,22 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+
+class UUIDPrimaryKeyMixin:
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+
+
+class TimestampMixin:
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), nullable=False
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        onupdate=func.now(),
+        nullable=False,
+    )

backend/app/models/outbox.py

@@ -0,0 +1,61 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import CheckConstraint, DateTime, Index, Integer, String, Text
+from sqlalchemy.dialects.postgresql import JSONB, UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import TimestampMixin
+
+DELIVERY_STATUSES = ("pending", "delivering", "succeeded", "failed")
+
+# The one delivery failure the demo seed deliberately plants (BK-H-0020, see
+# seed/workflow_runs.csv). It exists to show retry and audit working, so it must never
+# be read as an integration-health problem: it is a scripted prop, not evidence that
+# n8n is unhealthy. A dedicated error code -- rather than the generic
+# "connectionError" a real timeout produces -- is what lets every reader tell the two
+# apart without guessing from the message text.
+#
+# It is deliberately a `last_error_code` value and not a new column: the code is
+# already persisted, already surfaced to the UI, and already localizable, so no schema
+# change or migration is needed. A genuine later failure of this same event overwrites
+# the code with the real one, which is exactly right -- from that moment it *is* a real
+# failure.
+DEMO_SCENARIO_ERROR_CODE = "demoScenarioTimeout"
+
+
+def is_demo_scenario_failure(event: "OutboxEvent") -> bool:
+    """True for the prepared demo failure, false for every real one."""
+    return event.delivery_status == "failed" and event.last_error_code == DEMO_SCENARIO_ERROR_CODE
+
+
+class OutboxEvent(TimestampMixin, Base):
+    __tablename__ = "outbox_events"
+    __table_args__ = (
+        CheckConstraint(
+            "delivery_status IN ('pending','delivering','succeeded','failed')",
+            name="ck_outbox_delivery_status",
+        ),
+        CheckConstraint("attempts >= 0", name="ck_outbox_attempts"),
+        Index("ix_outbox_delivery_next_attempt", "delivery_status", "next_attempt_at"),
+    )
+
+    event_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    event_type: Mapped[str] = mapped_column(String(60), nullable=False)
+    aggregate_type: Mapped[str] = mapped_column(String(30), nullable=False)
+    aggregate_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+    payload_json: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
+    occurred_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    delivery_status: Mapped[str] = mapped_column(String(20), nullable=False, default="pending")
+    attempts: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    next_attempt_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    last_error: Mapped[str | None] = mapped_column(Text)
+    # Stable, localizable classification of last_error -- the frontend renders a
+    # localized summary from this code as the primary text and shows last_error itself
+    # only under "Technical details" (section 10 of docs/fleet-ops-correction/
+    # current-gap-audit.md). Kept alongside the raw message for backward compatibility.
+    last_error_code: Mapped[str | None] = mapped_column(String(60))
+    external_run_id: Mapped[str | None] = mapped_column(String(120))

backend/app/models/revoked_session.py

@@ -0,0 +1,16 @@
+from datetime import datetime
+
+from sqlalchemy import DateTime, String
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import TimestampMixin, UUIDPrimaryKeyMixin
+
+
+class RevokedSession(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "revoked_sessions"
+
+    token_hash: Mapped[str] = mapped_column(String(64), unique=True, index=True, nullable=False)
+    expires_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, index=True
+    )

backend/app/models/user.py

@@ -0,0 +1,23 @@
+from sqlalchemy import Boolean, String, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import TimestampMixin, UUIDPrimaryKeyMixin
+
+ROLES = ("operations_manager", "rental_employee")
+
+
+class User(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "users"
+    __table_args__ = (
+        UniqueConstraint("identity_provider", "external_subject", name="uq_user_external_identity"),
+    )
+
+    public_ref: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
+    email: Mapped[str | None] = mapped_column(String(320), unique=True, nullable=True)
+    password_hash: Mapped[str | None] = mapped_column(String(512), nullable=True)
+    display_name: Mapped[str] = mapped_column(String(120), nullable=False)
+    role: Mapped[str] = mapped_column(String(30), nullable=False)
+    active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
+    identity_provider: Mapped[str | None] = mapped_column(String(80), nullable=True)
+    external_subject: Mapped[str | None] = mapped_column(String(255), nullable=True)

backend/app/models/vehicle.py

@@ -0,0 +1,33 @@
+from sqlalchemy import Boolean, CheckConstraint, Integer, String
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.db import Base
+from app.models.mixins import TimestampMixin, UUIDPrimaryKeyMixin
+
+OPERATIONAL_STATUSES = ("available", "rented", "cleaning", "maintenance", "blocked")
+
+
+class Vehicle(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "vehicles"
+    __table_args__ = (
+        CheckConstraint(
+            "operational_status IN ('available','rented','cleaning','maintenance','blocked')",
+            name="ck_vehicles_operational_status",
+        ),
+        CheckConstraint("model_year BETWEEN 1900 AND 2100", name="ck_vehicles_model_year"),
+        CheckConstraint("odometer_km >= 0", name="ck_vehicles_odometer"),
+        CheckConstraint("next_service_km >= 0", name="ck_vehicles_next_service"),
+        CheckConstraint("version >= 1", name="ck_vehicles_version"),
+    )
+
+    public_ref: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
+    make: Mapped[str] = mapped_column(String(80), nullable=False)
+    model: Mapped[str] = mapped_column(String(80), nullable=False)
+    model_year: Mapped[int] = mapped_column(Integer, nullable=False)
+    registration_number: Mapped[str] = mapped_column(String(40), unique=True, nullable=False)
+    location: Mapped[str] = mapped_column(String(120), nullable=False)
+    operational_status: Mapped[str] = mapped_column(String(20), nullable=False)
+    odometer_km: Mapped[int] = mapped_column(Integer, nullable=False)
+    next_service_km: Mapped[int] = mapped_column(Integer, nullable=False)
+    active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
+    version: Mapped[int] = mapped_column(Integer, nullable=False, default=1)

backend/app/schemas.py

@@ -0,0 +1,650 @@
+from __future__ import annotations
+
+import uuid
+from datetime import datetime
+from typing import Annotated, Any, Literal
+
+from pydantic import BaseModel, ConfigDict, Field, StringConstraints
+
+Role = Literal["operations_manager", "rental_employee"]
+NonBlankOperationalReason = Annotated[
+    str,
+    StringConstraints(strip_whitespace=True, min_length=3, max_length=500),
+]
+
+
+class DemoLoginRequest(BaseModel):
+    role: Role
+
+
+class PasswordLoginRequest(BaseModel):
+    email: str = Field(min_length=3, max_length=320)
+    password: str = Field(min_length=8, max_length=256)
+
+
+class UserOut(BaseModel):
+    public_ref: str
+    email: str | None
+    display_name: str
+    role: Role
+    active: bool
+
+
+class CreateUserRequest(BaseModel):
+    email: str = Field(min_length=3, max_length=320)
+    display_name: str = Field(min_length=2, max_length=120)
+    role: Role
+    password: str = Field(min_length=8, max_length=256)
+
+
+class UpdateUserRequest(BaseModel):
+    display_name: str | None = Field(default=None, min_length=2, max_length=120)
+    role: Role | None = None
+    active: bool | None = None
+    password: str | None = Field(default=None, min_length=8, max_length=256)
+
+
+class CurrentUser(BaseModel):
+    public_ref: str
+    display_name: str
+    role: Role
+
+
+class VehicleOut(BaseModel):
+    public_ref: str
+    make: str
+    model: str
+    model_year: int
+    registration_number: str
+    location: str
+    operational_status: str
+    odometer_km: int
+    next_service_km: int
+    active: bool
+    attention: bool = False
+    attention_reason: str | None = None
+    service_remaining_km: int
+    next_booking_ref: str | None = None
+    next_booking_at: datetime | None = None
+
+
+class VehiclePageOut(BaseModel):
+    items: list[VehicleOut]
+    page: int
+    page_size: int
+    total: int
+    total_pages: int
+
+
+class BookingSummaryOut(BaseModel):
+    public_ref: str
+    customer_ref: str
+    vehicle_ref: str
+    starts_at: datetime
+    ends_at: datetime
+    status: str
+
+
+class BookingOut(BookingSummaryOut):
+    start_odometer_km: int | None
+    end_odometer_km: int | None
+    requirements_complete: bool
+    customer_name: str
+
+
+class CreateBookingRequest(BaseModel):
+    customer_ref: str = Field(min_length=3, max_length=20)
+    vehicle_ref: str = Field(min_length=3, max_length=20)
+    starts_at: datetime
+    ends_at: datetime
+
+
+class CompleteBookingRequirementsRequest(BaseModel):
+    confirmation: NonBlankOperationalReason
+
+
+class RescheduleBookingRequest(BaseModel):
+    starts_at: datetime
+    ends_at: datetime
+    reason: NonBlankOperationalReason
+
+
+class CustomerOptionOut(BaseModel):
+    public_ref: str
+    display_name: str
+    email: str | None
+
+
+class AvailableVehicleOut(BaseModel):
+    public_ref: str
+    make: str
+    model: str
+    registration_number: str
+    location: str
+    operational_status: str
+
+
+class CancelBookingRequest(BaseModel):
+    reason: NonBlankOperationalReason
+
+
+class CheckoutBookingRequest(BaseModel):
+    start_odometer_km: Annotated[int, Field(ge=0)]
+    fuel_level_percent: Annotated[int, Field(ge=0, le=100)]
+    cleanliness_ok: bool
+    damage_reported: bool = False
+    technical_warning: bool = False
+    notes: str | None = Field(default=None, max_length=2000)
+
+
+class CheckoutBookingResult(BaseModel):
+    booking_ref: str
+    vehicle_ref: str
+    inspection_ref: str
+    booking_status: str
+    resulting_vehicle_status: str
+    activated: bool
+    attention_reasons: list[str]
+
+
+class BookingPageOut(BaseModel):
+    items: list[BookingOut]
+    page: int
+    page_size: int
+    total: int
+    total_pages: int
+
+
+class RegisterReturnRequest(BaseModel):
+    end_odometer_km: Annotated[int, Field(ge=0)]
+    fuel_level_percent: Annotated[int, Field(ge=0, le=100)]
+    cleanliness_ok: bool
+    damage_reported: bool
+    technical_warning: bool
+    notes: str | None = Field(default=None, max_length=2000)
+
+
+class NextBookingRisk(BaseModel):
+    booking_ref: str
+    starts_at: datetime
+    at_risk: bool
+
+
+class RegisterReturnResult(BaseModel):
+    booking_ref: str
+    vehicle_ref: str
+    inspection_ref: str
+    resulting_vehicle_status: str
+    odometer_regression: bool
+    quality_issue_ref: str | None
+    workflow_event_id: str
+    correlation_id: str
+    next_booking_risk: NextBookingRisk | None
+
+
+class ReturnPreviewResult(BaseModel):
+    booking_ref: str
+    vehicle_ref: str
+    canonical_odometer_km: int
+    submitted_odometer_km: int
+    odometer_regression: bool
+    resulting_odometer_km: int
+    resulting_vehicle_status: str
+    status_reason: str
+    status_reason_code: str
+    status_reason_params: dict[str, str | int] = {}
+    would_create_quality_issue: bool
+    attention_reasons: list[str]
+    next_booking_risk: NextBookingRisk | None
+
+
+class InspectionOut(BaseModel):
+    public_ref: str
+    booking_ref: str
+    type: str
+    fuel_level_percent: int
+    cleanliness_ok: bool
+    damage_reported: bool
+    technical_warning: bool
+    odometer_km: int
+    completed_at: datetime
+
+
+class MaintenanceOut(BaseModel):
+    public_ref: str
+    occurred_at: datetime
+    odometer_km: int
+    category: str
+    summary: str
+
+
+class CreateMaintenanceRequest(BaseModel):
+    occurred_at: datetime
+    odometer_km: Annotated[int, Field(ge=0)]
+    category: Literal["periodic_service", "repair", "inspection", "tyres", "other"]
+    summary: str = Field(min_length=3, max_length=2000)
+    next_service_km: Annotated[int | None, Field(default=None, ge=0)]
+    mark_maintenance: bool = True
+
+
+class ReleaseVehicleRequest(BaseModel):
+    reason: NonBlankOperationalReason
+
+
+class DataQualityIssueOut(BaseModel):
+    public_ref: str
+    rule_type: str
+    entity_type: str
+    entity_ref: str
+    severity: str
+    status: str
+    evidence: dict[str, Any]
+    detected_at: datetime
+    due_at: datetime | None = None
+    assigned_to_ref: str | None = None
+    assigned_to_name: str | None = None
+    overdue: bool = False
+    resolved_at: datetime | None = None
+
+
+class DataQualityIssuePageOut(BaseModel):
+    items: list[DataQualityIssueOut]
+    page: int
+    page_size: int
+    total: int
+    total_pages: int
+
+
+class DataQualityIssueDetailOut(DataQualityIssueOut):
+    entity_snapshot: dict[str, Any] | None = None
+    related_snapshots: list[dict[str, Any]] = Field(default_factory=list)
+
+
+class BulkDataQualityWorkRequest(BaseModel):
+    issue_refs: list[str] = Field(min_length=1, max_length=25)
+    assigned_to_ref: str | None = Field(default=None, min_length=3, max_length=20)
+    clear_assignment: bool = False
+    due_at: datetime | None = None
+    clear_due_at: bool = False
+
+
+class BulkDataQualityWorkResult(BaseModel):
+    updated: list[DataQualityIssueOut]
+
+
+class MergeCustomersRequest(BaseModel):
+    survivor_ref: str
+    field_overrides: dict[str, str] | None = None
+
+
+class MergeCustomersResult(BaseModel):
+    issue_ref: str
+    survivor_ref: str
+    loser_ref: str
+    rewired_bookings: int
+
+
+class ScanResultOut(BaseModel):
+    created: dict[str, int]
+
+
+class WorkflowErrorReportIn(BaseModel):
+    workflow_id: str = Field(max_length=120)
+    workflow_name: str = Field(max_length=200)
+    execution_id: str = Field(max_length=120)
+    failed_at: datetime
+    error_category: Literal[
+        "timeout", "authError", "connectionError", "httpError", "validationError", "unknown"
+    ]
+    error_summary: str = Field(max_length=500)
+    trigger_context: str | None = Field(default=None, max_length=200)
+    correlation_id: uuid.UUID | None = None
+    attempt: int = Field(default=1, ge=1, le=1000)
+    retry_action: str | None = Field(default=None, max_length=200)
+
+
+class WorkflowErrorReportResult(BaseModel):
+    status: Literal["registered", "already_registered"]
+    execution_id: str
+    occurred_at: datetime
+
+
+class ProcedureDocumentOut(BaseModel):
+    id: str
+    language: str
+    document_id: str
+    title: str
+    version: str
+    content: str
+    content_hash: str
+
+
+class ProcedureListOut(BaseModel):
+    documents: list[ProcedureDocumentOut]
+
+
+class ProcedureSyncResultIn(BaseModel):
+    execution_id: str = Field(max_length=120)
+    synced: int = Field(ge=0)
+    failed: int = Field(default=0, ge=0)
+
+
+class ProcedureSyncResultResult(BaseModel):
+    status: Literal["registered", "already_registered"]
+    execution_id: str
+    occurred_at: datetime
+
+
+class ProvideFieldsRequest(BaseModel):
+    fields: dict[str, str]
+
+
+class ResolveOdometerRegressionRequest(BaseModel):
+    decision: Literal["retain_canonical", "correct_reading"]
+    booking_ref: str | None = None
+    corrected_odometer_km: Annotated[int, Field(ge=0)] | None = None
+    note: str | None = Field(default=None, max_length=500)
+
+
+class ResolveOverlapRequest(BaseModel):
+    booking_ref: str
+    note: str | None = Field(default=None, max_length=500)
+
+
+class VehicleStatusFactsOut(BaseModel):
+    active_booking_refs: list[str]
+    overlapping_booking_pairs: list[list[str]]
+    service_threshold_reached: bool
+    odometer_km: int
+    next_service_km: int
+    open_booking_overlap_issue_ref: str | None = None
+
+
+class StatusRecommendationOut(BaseModel):
+    current_status: str
+    recommended_status: str | None
+    recommendation_code: str
+    safe_to_apply: bool
+    manual_review_required: bool
+    facts: VehicleStatusFactsOut
+    blocking_reasons: list[str]
+    recommendation_token: str
+
+
+class ApplyRecommendedStatusRequest(BaseModel):
+    recommendation_token: str
+
+
+class ApplyRecommendedStatusResult(BaseModel):
+    issue: DataQualityIssueOut
+    applied_status: str
+    reason_code: str
+
+
+class SearchResultItem(BaseModel):
+    type: Literal["vehicle", "booking", "data_quality_issue", "section"]
+    label: str
+    detail_code: str
+    detail_params: dict[str, str] = {}
+    link: str
+
+
+class SearchResponse(BaseModel):
+    query: str
+    results: list[SearchResultItem]
+
+
+class OidcStatusOut(BaseModel):
+    enabled: bool
+    provider_name: str | None = None
+
+
+class PrivacyRetentionOut(BaseModel):
+    minimum_booking_retention_days: int
+    audit_retention_days: int
+    customers_total: int
+    customers_anonymized: int
+    customers_eligible: int
+
+
+class CustomerAnonymizeRequest(BaseModel):
+    confirmation: str = Field(min_length=1, max_length=20)
+    reason: str = Field(min_length=8, max_length=500)
+
+
+class CustomerAnonymizeResult(BaseModel):
+    public_ref: str
+    anonymized_at: datetime
+    status: Literal["anonymized", "already_anonymized"]
+
+
+class N8nWorkflowEvidence(BaseModel):
+    name: str
+    built: bool
+    last_seen_at: datetime | None
+    state: Literal["no_evidence", "healthy", "stale", "failed"] = "no_evidence"
+    last_status: Literal["succeeded", "failed"] | None = None
+    last_execution_id: str | None = None
+
+
+class ReturnCallbackIn(BaseModel):
+    """Body of the n8n return follow-up callback.
+
+    n8n forwards its whole item (``JSON.stringify($json)``), so unknown keys are ignored;
+    only the fields we persist are validated and bounded.
+    """
+
+    model_config = ConfigDict(extra="ignore")
+
+    event_id: uuid.UUID
+    correlation_id: uuid.UUID
+    follow_up: str | None = Field(default=None, max_length=200)
+    summary: str | None = Field(default=None, max_length=2000)
+
+
+class N8nHeartbeatIn(BaseModel):
+    workflow_id: str = Field(min_length=1, max_length=120)
+    workflow_name: str = Field(min_length=1, max_length=200)
+    execution_id: str = Field(min_length=1, max_length=120)
+    status: Literal["succeeded", "failed"]
+
+
+class N8nHeartbeatResult(BaseModel):
+    status: Literal["registered", "already_registered"]
+    execution_id: str
+    occurred_at: datetime
+
+
+class N8nErrorHandlerStatus(BaseModel):
+    total_failures_registered: int
+    latest_failure_at: datetime | None
+    latest_failure_workflow: str | None
+
+
+class N8nIntegrationStatus(BaseModel):
+    configured: bool
+    dispatch_enabled: bool
+    state: Literal["disabled", "unavailable", "degraded", "operational", "no_evidence"]
+    pending: int
+    #: Every failed delivery, staged and real together -- the number a viewer sees in
+    #: the run list.
+    failed: int
+    #: Failures that were not planted by the demo seed. This is the only failure count
+    #: that may influence `state`.
+    unexpected_failed: int = 0
+    #: Prepared demo failures (see `app.models.outbox.DEMO_SCENARIO_ERROR_CODE`).
+    #: Present so the UI can label them instead of implying the automation is broken.
+    demo_scenario_failed: int = 0
+    delivering: int
+    succeeded: int
+    latest_success_at: datetime | None
+    #: Most recent *real* failure; a staged one never sets this.
+    latest_failure_at: datetime | None
+    latest_demo_scenario_at: datetime | None = None
+    expected_workflow_count: int
+    known_workflow_count: int
+    workflows: list[N8nWorkflowEvidence]
+    error_handler: N8nErrorHandlerStatus
+
+
+class McpHubIntegrationStatus(BaseModel):
+    registration_enabled: bool
+    state: Literal["not_configured", "no_evidence", "operational"]
+    total_calls: int
+    last_tool: str | None = None
+    last_client: str | None = None
+    last_called_at: datetime | None = None
+    hub_reachable: bool | None = None
+
+
+class IntegrationStatusOut(BaseModel):
+    n8n: N8nIntegrationStatus
+    mcp_hub: McpHubIntegrationStatus
+
+
+class DemoScenarioOut(BaseModel):
+    id: str
+    estimated_minutes: int
+    required_roles: list[Role]
+    start_path: str
+    ready: bool
+    blocked_reason_code: str | None = None
+    blocked_reason_params: dict[str, str] = {}
+
+
+class DemoIntegrationSummaryOut(BaseModel):
+    key: Literal["n8n", "ragcore", "mcp_hub"]
+    status_code: str
+    detail_code: str
+    detail_params: dict[str, str | int] = {}
+
+
+class DemoManifestOut(BaseModel):
+    demo_mode: bool
+    organization_name: str
+    timezone: str
+    synthetic_data: bool
+    allow_reset: bool
+    last_reset_at: datetime | None
+    anchor_date: str | None
+    guide_available: bool
+    required_roles: list[Role]
+    scenarios: list[DemoScenarioOut]
+    integrations: list[DemoIntegrationSummaryOut]
+
+
+class VehicleDetailOut(VehicleOut):
+    bookings: list[BookingSummaryOut] = Field(default_factory=list)
+    inspections: list[InspectionOut] = Field(default_factory=list)
+    maintenance: list[MaintenanceOut] = Field(default_factory=list)
+    quality_issues: list[DataQualityIssueOut] = Field(default_factory=list)
+
+
+class DashboardMetrics(BaseModel):
+    available: int
+    rented: int
+    cleaning: int
+    maintenance: int
+    blocked: int
+    open_quality_issues: int
+    pending_or_failed_workflows: int
+
+
+class EvidenceSignalOut(BaseModel):
+    code: str
+    params: dict[str, Any] = Field(default_factory=dict)
+
+
+class AttentionItem(BaseModel):
+    kind: Literal["quality_issue", "vehicle"]
+    severity: str
+    rule_type: str
+    evidence_signals: list[EvidenceSignalOut] = Field(default_factory=list)
+    link_type: Literal["vehicle", "booking", "customer"]
+    link_ref: str
+    issue_ref: str | None = None
+
+
+class TodayItem(BaseModel):
+    kind: Literal["departure", "return"]
+    booking_ref: str
+    vehicle_ref: str
+    scheduled_at: datetime
+
+
+class AutomationRunOut(BaseModel):
+    event_id: str
+    event_type: str
+    aggregate_ref: str
+    status: str
+    attempts: int
+    last_error: str | None
+    last_error_code: str | None
+    #: True for the deliberately seeded demo failure. The UI uses this to label the run
+    #: as a prepared scenario and to offer the demo retry, instead of presenting it as
+    #: an unexplained production error.
+    is_demo_scenario: bool = False
+    occurred_at: datetime
+
+
+class DashboardOut(BaseModel):
+    metrics: DashboardMetrics
+    attention_items: list[AttentionItem]
+    today: list[TodayItem]
+    recent_automation: list[AutomationRunOut]
+
+
+class OperationsSummaryOut(BaseModel):
+    tenant: str
+    metrics: DashboardMetrics
+
+
+class AttentionVehicleOut(BaseModel):
+    vehicle_ref: str
+    severity: Literal["low", "medium", "high"]
+    rule_type: str
+    summary: str
+    detected_at: datetime
+
+
+class McpVehicleDetailOut(BaseModel):
+    public_ref: str
+    make: str
+    model: str
+    model_year: int
+    location: str
+    operational_status: str
+    odometer_km: int
+    next_service_km: int
+    open_quality_issue_count: int
+    current_booking_ref: str | None
+
+
+class McpKnowledgeSearchRequest(BaseModel):
+    question: str = Field(min_length=3, max_length=1000)
+    max_sources: int = Field(default=4, ge=1, le=8)
+    locale: Literal["nl-BE", "en-GB", "fr-BE"] = "en-GB"
+
+
+class AuditEventOut(BaseModel):
+    id: str
+    actor_type: str
+    actor_label: str
+    action: str
+    entity_type: str
+    entity_id: str | None
+    entity_ref: str | None = None
+    entity_link: str | None = None
+    correlation_id: str
+    occurred_at: datetime
+    before: dict[str, Any] | None = None
+    after: dict[str, Any] | None = None
+    metadata: dict[str, Any] | None = None
+
+
+class AuditEventPageOut(BaseModel):
+    items: list[AuditEventOut]
+    page: int
+    page_size: int
+    total: int
+    total_pages: int

backend/app/seed_loader.py

@@ -0,0 +1,500 @@
+from __future__ import annotations
+
+import csv
+import uuid
+from dataclasses import dataclass
+from datetime import UTC, date, datetime, timedelta
+from difflib import SequenceMatcher
+from pathlib import Path
+
+from sqlalchemy import delete, insert, update
+from sqlalchemy.orm import Session
+
+from app.core.config import get_settings
+from app.core.db import begin_exclusive_demo_reset, end_exclusive_demo_reset
+from app.models.audit import AuditEvent
+from app.models.booking import Booking
+from app.models.customer import Customer
+from app.models.data_quality import DataQualityIssue
+from app.models.idempotency import IdempotencyRecord
+from app.models.inspection import Inspection
+from app.models.maintenance import MaintenanceRecord
+from app.models.outbox import DEMO_SCENARIO_ERROR_CODE, OutboxEvent
+from app.models.user import User
+from app.models.vehicle import Vehicle
+from app.services.audit import record_audit_event
+
+settings = get_settings()
+
+DEMO_USERS = [
+    {
+        "public_ref": "USR-OPS",
+        "display_name": "Amelie De Ridder",
+        "role": "operations_manager",
+    },
+    {
+        "public_ref": "USR-EMP",
+        "display_name": "Karim Boujaddaine",
+        "role": "rental_employee",
+    },
+]
+
+# seed/generate_seed.py authored the committed CSVs relative to this fixed date
+# (`--anchor 2026-08-01`, matching Settings.demo_today). Every reset shifts every
+# seeded date by (today - SEED_AUTHORED_ANCHOR) so "today" / "near-future" / "overlaps
+# right now" scenarios stay true to the actual reset moment instead of decaying as real
+# time passes between resets -- a fixed anchor with no shift goes stale within days.
+SEED_AUTHORED_ANCHOR = date(2026, 8, 1)
+
+
+def _seed_anchor_shift(today: date) -> timedelta:
+    return today - SEED_AUTHORED_ANCHOR
+
+
+def _parse_dt(value: str) -> datetime:
+    return datetime.fromisoformat(value.replace("Z", "+00:00"))
+
+
+def _parse_bool(value: str) -> bool:
+    return value.strip().lower() == "true"
+
+
+def _parse_optional_int(value: str) -> int | None:
+    value = value.strip()
+    return int(value) if value else None
+
+
+@dataclass
+class SeedResult:
+    counts: dict[str, int]
+    anchor_date: date
+    seeded_at: datetime
+
+
+def _seed_dir() -> Path:
+    return Path(settings.seed_dir)
+
+
+def _read_csv(name: str) -> list[dict[str, str]]:
+    path = _seed_dir() / name
+    with path.open(newline="", encoding="utf-8") as handle:
+        return list(csv.DictReader(handle))
+
+
+_PERSISTENT_TELEMETRY_ACTIONS = (
+    "mcp_tool_request",
+    "n8n_return_followup_recorded",
+    "n8n_workflow_failure_registered",
+    "n8n_procedures_synced",
+    "n8n_workflow_heartbeat",
+    "knowledge_question_asked",
+)
+
+
+def clear_all(db: Session, *, preserve_integration_telemetry: bool = False) -> None:
+    # RevokedSession is intentionally NOT cleared: it has no FK to users and wiping it
+    # would silently re-validate cookies that were logged out before the reset.
+    for model in (
+        OutboxEvent,
+        IdempotencyRecord,
+        DataQualityIssue,
+        Inspection,
+        MaintenanceRecord,
+        Booking,
+        Vehicle,
+        Customer,
+        User,
+    ):
+        db.execute(delete(model))
+    if preserve_integration_telemetry:
+        db.execute(
+            delete(AuditEvent).where(AuditEvent.action.not_in(_PERSISTENT_TELEMETRY_ACTIONS))
+        )
+    else:
+        db.execute(delete(AuditEvent))
+
+
+def load_seed(db: Session) -> SeedResult:
+    counts: dict[str, int] = {}
+    today = datetime.now(UTC).date()
+    shift = _seed_anchor_shift(today)
+
+    user_rows = [{"id": uuid.uuid4(), **user, "active": True} for user in DEMO_USERS]
+    db.execute(insert(User), user_rows)
+    counts["users"] = len(user_rows)
+
+    customer_id_by_ref: dict[str, uuid.UUID] = {}
+    customer_rows = []
+    customer_row_by_ref: dict[str, dict] = {}
+    for row in _read_csv("customers.csv"):
+        cid = uuid.uuid4()
+        customer_id_by_ref[row["public_ref"]] = cid
+        customer_row = {
+            "id": cid,
+            "public_ref": row["public_ref"],
+            "first_name": row["first_name"],
+            "last_name": row["last_name"],
+            "email": row["email"] or None,
+            "phone": row["phone"] or None,
+            "postal_code": row["postal_code"] or None,
+            "city": row["city"] or None,
+        }
+        customer_rows.append(customer_row)
+        customer_row_by_ref[row["public_ref"]] = customer_row
+    db.execute(insert(Customer), customer_rows)
+    counts["customers"] = len(customer_rows)
+    # Second pass for merged_into (self-referencing FK) since target must exist first.
+    for row in _read_csv("customers.csv"):
+        merged_ref = row.get("merged_into") or ""
+        if merged_ref:
+            db.execute(
+                update(Customer)
+                .where(Customer.id == customer_id_by_ref[row["public_ref"]])
+                .values(merged_into_customer_id=customer_id_by_ref[merged_ref])
+            )
+
+    vehicle_id_by_ref: dict[str, uuid.UUID] = {}
+    vehicle_rows = []
+    vehicle_row_by_ref: dict[str, dict] = {}
+    for row in _read_csv("vehicles.csv"):
+        vid = uuid.uuid4()
+        vehicle_id_by_ref[row["public_ref"]] = vid
+        vehicle_row = {
+            "id": vid,
+            "public_ref": row["public_ref"],
+            "make": row["make"],
+            "model": row["model"],
+            "model_year": int(row["model_year"]),
+            "registration_number": row["registration_number"],
+            "location": row["location"],
+            "operational_status": row["operational_status"],
+            "odometer_km": int(row["odometer_km"]),
+            "next_service_km": int(row["next_service_km"]),
+            "active": _parse_bool(row["active"]),
+            "version": 1,
+        }
+        vehicle_rows.append(vehicle_row)
+        vehicle_row_by_ref[row["public_ref"]] = vehicle_row
+    db.execute(insert(Vehicle), vehicle_rows)
+    counts["vehicles"] = len(vehicle_rows)
+
+    booking_id_by_ref: dict[str, uuid.UUID] = {}
+    booking_rows = []
+    booking_row_by_ref: dict[str, dict] = {}
+    for row in _read_csv("bookings.csv"):
+        bid = uuid.uuid4()
+        booking_id_by_ref[row["public_ref"]] = bid
+        booking_row = {
+            "id": bid,
+            "public_ref": row["public_ref"],
+            "customer_id": customer_id_by_ref[row["customer_ref"]],
+            "vehicle_id": vehicle_id_by_ref[row["vehicle_ref"]],
+            "starts_at": _parse_dt(row["starts_at"]) + shift,
+            "ends_at": _parse_dt(row["ends_at"]) + shift,
+            "status": row["status"],
+            "start_odometer_km": _parse_optional_int(row["start_odometer_km"]),
+            "end_odometer_km": _parse_optional_int(row["end_odometer_km"]),
+            "requirements_complete": _parse_bool(row["requirements_complete"]),
+        }
+        booking_rows.append(booking_row)
+        booking_row_by_ref[row["public_ref"]] = booking_row
+    db.execute(insert(Booking), booking_rows)
+    counts["bookings"] = len(booking_rows)
+
+    inspection_rows = []
+    inspection_source_rows = _read_csv("inspections.csv")
+    return_inspection_row_by_booking_ref = {
+        row["booking_ref"]: row for row in inspection_source_rows if row["type"] == "return"
+    }
+    for row in inspection_source_rows:
+        inspection_rows.append(
+            {
+                "id": uuid.uuid4(),
+                "public_ref": row["public_ref"],
+                "booking_id": booking_id_by_ref[row["booking_ref"]],
+                "vehicle_id": vehicle_id_by_ref[row["vehicle_ref"]],
+                "type": row["type"],
+                "fuel_level_percent": int(row["fuel_level_percent"]),
+                "cleanliness_ok": _parse_bool(row["cleanliness_ok"]),
+                "damage_reported": _parse_bool(row["damage_reported"]),
+                "technical_warning": _parse_bool(row["technical_warning"]),
+                "odometer_km": int(row["odometer_km"]),
+                "completed_at": _parse_dt(row["completed_at"]) + shift,
+                "completed_by": None,
+            }
+        )
+    db.execute(insert(Inspection), inspection_rows)
+    counts["inspections"] = len(inspection_rows)
+
+    maintenance_rows = []
+    for row in _read_csv("maintenance.csv"):
+        maintenance_rows.append(
+            {
+                "id": uuid.uuid4(),
+                "public_ref": row["public_ref"],
+                "vehicle_id": vehicle_id_by_ref[row["vehicle_ref"]],
+                "occurred_at": _parse_dt(row["occurred_at"]) + shift,
+                "odometer_km": int(row["odometer_km"]),
+                "category": row["category"],
+                "summary": row["summary"],
+            }
+        )
+    db.execute(insert(MaintenanceRecord), maintenance_rows)
+    counts["maintenance"] = len(maintenance_rows)
+
+    def resolve_entity(entity_ref: str) -> tuple[str, uuid.UUID]:
+        if entity_ref.startswith("CUS-"):
+            return "customer", customer_id_by_ref[entity_ref]
+        return "vehicle", vehicle_id_by_ref[entity_ref]
+
+    def _vehicle_conflict_facts(vehicle_ref: str, *, service_threshold_reached: bool) -> dict:
+        # Mirrors app.services.vehicle_status.VehicleStatusFacts.as_dict() for the
+        # handful of seed-only rows below -- none of them carry an active rental or a
+        # real booking conflict (verified against the fixed seed dataset), only a
+        # genuinely-crossed service threshold or none at all, so those two fields are
+        # the only ones that vary per vehicle.
+        vehicle = vehicle_row_by_ref[vehicle_ref]
+        return {
+            "active_booking_refs": [],
+            "overlapping_booking_pairs": [],
+            "service_threshold_reached": service_threshold_reached,
+            "odometer_km": vehicle["odometer_km"],
+            "next_service_km": vehicle["next_service_km"],
+            "open_booking_overlap_issue_ref": None,
+        }
+
+    def _odometer_regression_signal(later_ref: str, earlier_ref: str) -> list[dict]:
+        later = return_inspection_row_by_booking_ref[later_ref]
+        earlier = return_inspection_row_by_booking_ref[earlier_ref]
+        return [
+            {
+                "code": "odometer.regression",
+                "source_type": "return",
+                "params": {
+                    "later_ref": later["public_ref"],
+                    "later_km": int(later["odometer_km"]),
+                    "earlier_ref": earlier["public_ref"],
+                    "earlier_km": int(earlier["odometer_km"]),
+                    "booking_ref": later_ref,
+                },
+            }
+        ]
+
+    def _missing_field_signal(field: str) -> list[dict]:
+        return [{"code": "missing_field", "params": {"field": field}}]
+
+    # Every seed-only row below (i.e. not one of the four named DQ-DEMO-* scenarios)
+    # used to carry no structured signal at all -- just the placeholder summary
+    # "Synthetic deterministic seed issue". Each now cites a real fact about its actual
+    # entity (a genuinely-crossed service threshold, a genuinely-blank field, or a real
+    # pair of booking odometer readings engineered into seed/bookings.csv), using the
+    # exact same signal vocabulary the live scan (app.services.data_quality) already
+    # renders through -- see docs/fleet-ops-correction/current-gap-audit.md §6.
+    _SEED_SIGNALS_BY_REF: dict[str, list[dict]] = {
+        "DQ-0005": [
+            {
+                "code": "vehicle.service_threshold_reached",
+                "params": _vehicle_conflict_facts("MO-036", service_threshold_reached=True),
+            }
+        ],
+        "DQ-0006": _missing_field_signal("location"),
+        "DQ-0007": _odometer_regression_signal("BK-H-0007", "BK-H-0057"),
+        "DQ-0008": [
+            {
+                "code": "vehicle.rental_ended",
+                "params": _vehicle_conflict_facts("MO-007", service_threshold_reached=False),
+            }
+        ],
+        "DQ-0009": _missing_field_signal("location"),
+        "DQ-0010": _odometer_regression_signal("BK-H-0010", "BK-H-0060"),
+        "DQ-0011": [
+            {
+                "code": "vehicle.service_threshold_reached",
+                "params": _vehicle_conflict_facts("MO-028", service_threshold_reached=True),
+            }
+        ],
+        "DQ-0012": _missing_field_signal("registration_number"),
+        "DQ-0013": _missing_field_signal("location"),
+        "DQ-0014": _missing_field_signal("registration_number"),
+        "DQ-0015": _missing_field_signal("location"),
+        "DQ-0016": _missing_field_signal("location"),
+        "DQ-0017": _missing_field_signal("location"),
+        "DQ-0018": _missing_field_signal("registration_number"),
+        "DQ-0019": _missing_field_signal("location"),
+        "DQ-0020": _missing_field_signal("location"),
+        "DQ-0021": _missing_field_signal("location"),
+    }
+
+    def _seed_signals(public_ref: str, entity_ref: str, related_refs: list[str]) -> list[dict]:
+        # The four named DQ-DEMO-* rows anchor the guided demo's scripted scenarios, so
+        # they carry real, accurate structured signals (not just a legacy English
+        # sentence) -- the frontend renders these as the primary, localized evidence;
+        # see docs/fleet-ops-correction/current-gap-audit.md §6.
+        if public_ref == "DQ-DEMO-DUPLICATE":
+            a = customer_row_by_ref[entity_ref]
+            b = customer_row_by_ref[related_refs[0]]
+            name_a = f"{a['first_name']} {a['last_name']}".strip().lower()
+            name_b = f"{b['first_name']} {b['last_name']}".strip().lower()
+            ratio = SequenceMatcher(None, name_a, name_b).ratio()
+            return [
+                {"code": "duplicate.exact_email"},
+                {"code": "duplicate.exact_phone"},
+                {"code": "duplicate.same_postal_code"},
+                {"code": "duplicate.similar_name", "params": {"score": round(ratio, 2)}},
+            ]
+        if public_ref == "DQ-DEMO-OVERLAP":
+            return [{"code": "overlap.reserved_bookings", "params": {"refs": related_refs}}]
+        if public_ref == "DQ-DEMO-STATUS":
+            return [{"code": "vehicle.booking_conflict"}]
+        if public_ref == "DQ-DEMO-ATTENTION":
+            return [
+                {
+                    "code": "attention.upcoming_booking_missing_inspection",
+                    "params": {"booking_ref": related_refs[0] if related_refs else ""},
+                }
+            ]
+        return _SEED_SIGNALS_BY_REF.get(public_ref, [])
+
+    dq_rows = []
+    now = datetime.now(UTC)
+    for row in _read_csv("data_quality_issues.csv"):
+        entity_type, entity_id = resolve_entity(row["entity_ref"])
+        related_ref = row.get("related_ref") or ""
+        related_refs = related_ref.split("|") if related_ref else []
+        signals = _seed_signals(row["public_ref"], row["entity_ref"], related_refs)
+        evidence_extra: dict[str, object] = {}
+        if row["rule_type"] == "odometer_regression" and signals:
+            params = signals[0].get("params", {})
+            later_ref = params.get("later_ref")
+            earlier_ref = params.get("earlier_ref")
+            booking_ref = params.get("booking_ref")
+            if (
+                isinstance(earlier_ref, str)
+                and isinstance(later_ref, str)
+                and isinstance(booking_ref, str)
+            ):
+                # The authored CSV prose predates structured references. Preserve the
+                # two real source bookings so the detail page can show evidence, while
+                # only the later (regressing) reading is eligible for correction.
+                related_refs = [earlier_ref, booking_ref, later_ref]
+                evidence_extra = {
+                    "source_type": signals[0].get("source_type", "return"),
+                    "source_types": [signals[0].get("source_type", "return")],
+                    "correctable_booking_refs": [booking_ref],
+                }
+        severity_due_delta = {
+            "high": timedelta(hours=4),
+            "medium": timedelta(days=1),
+            "low": timedelta(days=3),
+        }.get(row["severity"], timedelta(days=1))
+        dq_rows.append(
+            {
+                "id": uuid.uuid4(),
+                "public_ref": row["public_ref"],
+                "rule_type": row["rule_type"],
+                "entity_type": entity_type,
+                "entity_id": entity_id,
+                "severity": row["severity"],
+                "status": row["status"],
+                "evidence_json": {
+                    "summary": row["evidence"],
+                    "entity_ref": row["entity_ref"],
+                    "related_refs": related_refs,
+                    "signals": signals,
+                    **evidence_extra,
+                },
+                "proposed_action_json": {},
+                "detected_at": now,
+                "due_at": now + severity_due_delta if row["status"] == "open" else None,
+                "resolved_at": now if row["status"] == "resolved" else None,
+                "resolved_by": "USR-OPS" if row["status"] == "resolved" else None,
+            }
+        )
+    db.execute(insert(DataQualityIssue), dq_rows)
+    counts["data_quality_issues"] = len(dq_rows)
+
+    vehicle_ref_by_booking_ref = {
+        row["public_ref"]: row["vehicle_ref"] for row in _read_csv("bookings.csv")
+    }
+
+    outbox_rows = []
+    for row in _read_csv("workflow_runs.csv"):
+        booking_id = booking_id_by_ref.get(row["aggregate_ref"])
+        # Build the same schema-complete envelope the live return workflow (M2) produces,
+        # so a seeded/historical event is redeliverable (e.g. via manual retry) without the
+        # dispatcher crashing on a missing key. See PROJECT_STATE.md M4 notes.
+        outbox_rows.append(
+            {
+                "event_id": uuid.UUID(row["event_id"]),
+                "event_type": row["event_type"],
+                "aggregate_type": "booking",
+                "aggregate_id": booking_id or uuid.uuid4(),
+                "payload_json": {
+                    "correlation_id": str(uuid.uuid4()),
+                    "aggregate": {
+                        "type": "booking",
+                        "id": str(booking_id or uuid.uuid4()),
+                        "public_ref": row["aggregate_ref"],
+                    },
+                    "data": {
+                        "vehicle_ref": vehicle_ref_by_booking_ref.get(row["aggregate_ref"], ""),
+                        "inspection_ref": "",
+                        "resulting_vehicle_status": "cleaning",
+                        "attention_reasons": [],
+                    },
+                    "aggregate_ref": row["aggregate_ref"],
+                },
+                "occurred_at": _parse_dt(row["occurred_at"]) + shift,
+                "delivery_status": row["status"],
+                "attempts": int(row["attempts"]),
+                "next_attempt_at": None,
+                "last_error": row["last_error"] or None,
+                # The seed dataset's one synthetic failure (BK-H-0020) models a
+                # connection-timeout-style delivery failure -- see workflow_runs.csv.
+                # It is coded as a *prepared demo scenario*, not as a real
+                # connectionError, so integration health never degrades because of a
+                # prop and a viewer is told plainly that this failure is staged.
+                "last_error_code": DEMO_SCENARIO_ERROR_CODE if row["last_error"] else None,
+                "external_run_id": None,
+            }
+        )
+    db.execute(insert(OutboxEvent), outbox_rows)
+    counts["workflow_runs"] = len(outbox_rows)
+
+    seeded_at = datetime.now(UTC)
+    record_audit_event(
+        db,
+        actor_type="system",
+        actor_label="seed loader",
+        action="demo_data_seeded",
+        entity_type="system",
+        metadata={
+            "anchor_date": today.isoformat(),
+            "seed_authored_anchor": SEED_AUTHORED_ANCHOR.isoformat(),
+            "counts": counts,
+        },
+    )
+
+    return SeedResult(counts=counts, anchor_date=today, seeded_at=seeded_at)
+
+
+def reset_and_seed(
+    db: Session,
+    *,
+    preserve_integration_telemetry: bool = False,
+    commit: bool = True,
+) -> SeedResult:
+    from app.services.data_quality import run_scan
+
+    if not db.info.get("mobilityops_demo_reset_exclusive"):
+        begin_exclusive_demo_reset(db)
+    clear_all(db, preserve_integration_telemetry=preserve_integration_telemetry)
+    result = load_seed(db)
+    scan = run_scan(db, commit=False)
+    result.counts["data_quality_issues"] += sum(scan.created.values())
+    if commit:
+        db.commit()
+        end_exclusive_demo_reset(db)
+    else:
+        db.flush()
+    return result

backend/app/services/audit.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+import uuid
+from datetime import UTC, datetime
+from typing import Any
+
+from sqlalchemy.orm import Session
+
+from app.models.audit import AuditEvent
+
+
+def record_audit_event(
+    db: Session,
+    *,
+    actor_type: str,
+    actor_label: str,
+    action: str,
+    entity_type: str,
+    actor_id: uuid.UUID | None = None,
+    entity_id: uuid.UUID | None = None,
+    correlation_id: uuid.UUID | None = None,
+    before: dict[str, Any] | None = None,
+    after: dict[str, Any] | None = None,
+    metadata: dict[str, Any] | None = None,
+) -> AuditEvent:
+    event = AuditEvent(
+        actor_type=actor_type,
+        actor_id=actor_id,
+        actor_label=actor_label,
+        action=action,
+        entity_type=entity_type,
+        entity_id=entity_id,
+        correlation_id=correlation_id or uuid.uuid4(),
+        before_json=before,
+        after_json=after,
+        metadata_json=metadata,
+        occurred_at=datetime.now(UTC),
+    )
+    db.add(event)
+    return event

backend/app/services/data_quality.py

@@ -0,0 +1,799 @@
+from __future__ import annotations
+
+import uuid
+from dataclasses import dataclass, field
+from datetime import UTC, datetime
+
+from sqlalchemy import func, select, update
+from sqlalchemy.orm import Session
+
+from app.core.errors import AppError
+from app.models.booking import Booking
+from app.models.customer import Customer
+from app.models.data_quality import DataQualityIssue
+from app.models.inspection import Inspection
+from app.models.maintenance import MaintenanceRecord
+from app.models.vehicle import Vehicle
+from app.schemas import CurrentUser
+from app.services.audit import record_audit_event
+from app.services.data_quality_common import has_open_issue as _has_open_issue
+from app.services.data_quality_common import issue_due_at
+from app.services.data_quality_common import load_open_issue as _load_open_issue
+from app.services.data_quality_common import new_scan_ref as _new_scan_ref
+from app.services.data_quality_duplicate_scan import scan_duplicate_customers
+from app.services.data_quality_odometer import (
+    open_odometer_regression_issue as open_odometer_regression_issue,
+)
+from app.services.data_quality_odometer import (
+    resolve_odometer_regression as resolve_odometer_regression,
+)
+from app.services.vehicle_status import (
+    RECOMMENDATION_CODE_NO_CONFLICT,
+    VehicleStatusRecommendation,
+    compute_recommendation_token,
+    evaluate_vehicle_status,
+    gather_vehicle_status_facts,
+)
+
+REQUIRED_CUSTOMER_FIELDS = ("first_name", "last_name")
+REQUIRED_VEHICLE_FIELDS = ("registration_number", "make", "model", "location")
+DATA_QUALITY_SCAN_LOCK_ID = 6_138_493_717_091_029_491
+
+
+@dataclass
+class ScanResult:
+    created: dict[str, int] = field(default_factory=dict)
+
+    def bump(self, rule_type: str) -> None:
+        self.created[rule_type] = self.created.get(rule_type, 0) + 1
+
+
+def _open_issue(
+    db: Session,
+    scan: ScanResult,
+    *,
+    rule_type: str,
+    entity_type: str,
+    entity_id: uuid.UUID,
+    severity: str,
+    summary: str,
+    entity_ref: str,
+    related_refs: list[str],
+    signals: list[dict] | None = None,
+    evidence_extra: dict | None = None,
+) -> None:
+    if _has_open_issue(db, rule_type, entity_type, entity_id):
+        return
+    now = datetime.now(UTC)
+
+    # Reintroduced evidence creates a new issue rather than silently reopening the old
+    # one, but it stays linked to whatever decision was made last time so an operator
+    # doesn't re-litigate from a blank slate.
+    previous = db.scalar(
+        select(DataQualityIssue)
+        .where(
+            DataQualityIssue.rule_type == rule_type,
+            DataQualityIssue.entity_type == entity_type,
+            DataQualityIssue.entity_id == entity_id,
+            DataQualityIssue.status != "open",
+        )
+        .order_by(DataQualityIssue.detected_at.desc())
+    )
+    # `summary` is kept as a technical-fallback string (shown only under "Technical
+    # details"); `signals` is the stable, localizable structure the frontend renders as
+    # the primary evidence -- see docs/fleet-ops-correction/current-gap-audit.md §2/§6.
+    evidence: dict = {
+        "summary": summary,
+        "entity_ref": entity_ref,
+        "related_refs": related_refs,
+        "signals": signals or [],
+    }
+    evidence.update(evidence_extra or {})
+    if previous is not None:
+        evidence["reopened_from"] = previous.public_ref
+        evidence["previous_decision"] = previous.status
+
+    issue = DataQualityIssue(
+        public_ref=_new_scan_ref("DQ-SCAN"),
+        rule_type=rule_type,
+        entity_type=entity_type,
+        entity_id=entity_id,
+        severity=severity,
+        status="open",
+        evidence_json=evidence,
+        proposed_action_json={},
+        detected_at=now,
+        due_at=issue_due_at(now, severity),
+    )
+    db.add(issue)
+    db.flush()
+    scan.bump(rule_type)
+
+
+def _scan_missing_required_fields(db: Session, scan: ScanResult) -> None:
+    # Anonymised customers have had their contact data removed on purpose; flagging
+    # them as "missing required field" would only be resolvable by re-entering PII.
+    for customer in db.scalars(
+        select(Customer).where(
+            Customer.merged_into_customer_id.is_(None),
+            Customer.anonymized_at.is_(None),
+        )
+    ).all():
+        missing = [f for f in REQUIRED_CUSTOMER_FIELDS if not getattr(customer, f)]
+        if not customer.email and not customer.phone:
+            missing.append("email_or_phone")
+        if missing:
+            _open_issue(
+                db,
+                scan,
+                rule_type="missing_required_field",
+                entity_type="customer",
+                entity_id=customer.id,
+                severity="low",
+                summary=f"Missing: {', '.join(missing)}",
+                entity_ref=customer.public_ref,
+                related_refs=[],
+                signals=[{"code": "missing_field", "params": {"field": f}} for f in missing],
+            )
+
+    for vehicle in db.scalars(select(Vehicle).where(Vehicle.active.is_(True))).all():
+        missing = [f for f in REQUIRED_VEHICLE_FIELDS if not getattr(vehicle, f)]
+        if missing:
+            _open_issue(
+                db,
+                scan,
+                rule_type="missing_required_field",
+                entity_type="vehicle",
+                entity_id=vehicle.id,
+                severity="low",
+                summary=f"Missing: {', '.join(missing)}",
+                entity_ref=vehicle.public_ref,
+                related_refs=[],
+                signals=[{"code": "missing_field", "params": {"field": f}} for f in missing],
+            )
+
+
+def _scan_booking_overlaps(db: Session, scan: ScanResult) -> None:
+    vehicles = db.scalars(select(Vehicle)).all()
+    bookings_by_vehicle: dict[uuid.UUID, list[Booking]] = {}
+    for booking in db.scalars(
+        select(Booking).where(Booking.status.in_(["reserved", "active"]))
+    ).all():
+        bookings_by_vehicle.setdefault(booking.vehicle_id, []).append(booking)
+
+    vehicle_by_id = {v.id: v for v in vehicles}
+    for vehicle_id, bookings in bookings_by_vehicle.items():
+        bookings.sort(key=lambda b: b.starts_at)
+        for i, first in enumerate(bookings):
+            for second in bookings[i + 1 :]:
+                if second.starts_at < first.ends_at and first.starts_at < second.ends_at:
+                    vehicle = vehicle_by_id[vehicle_id]
+                    _open_issue(
+                        db,
+                        scan,
+                        rule_type="booking_overlap",
+                        entity_type="vehicle",
+                        entity_id=vehicle_id,
+                        severity="high",
+                        summary=f"Overlapping bookings {first.public_ref} and {second.public_ref}",
+                        entity_ref=vehicle.public_ref,
+                        related_refs=[first.public_ref, second.public_ref],
+                        signals=[
+                            {
+                                "code": "overlap.reserved_bookings",
+                                "params": {"refs": [first.public_ref, second.public_ref]},
+                            }
+                        ],
+                    )
+
+
+def _scan_vehicle_status_conflicts(db: Session, scan: ScanResult) -> None:
+    # Uses the same shared evaluator as the preview/apply flow (app.services.vehicle_status)
+    # so detection and resolution can never structurally disagree -- see
+    # docs/fleet-ops-correction/vehicle-status-decision-table.md.
+    vehicles = db.scalars(select(Vehicle)).all()
+    for vehicle in vehicles:
+        facts = gather_vehicle_status_facts(db, vehicle)
+        recommendation = evaluate_vehicle_status(vehicle, facts)
+        if recommendation.recommendation_code == RECOMMENDATION_CODE_NO_CONFLICT:
+            continue
+
+        signals = [{"code": recommendation.recommendation_code, "params": facts.as_dict()}]
+        summary = (
+            f"Recommended status: {recommendation.recommended_status}"
+            if recommendation.recommended_status
+            else "Manual review required: active rental conflicts with a blocking condition"
+        )
+        _open_issue(
+            db,
+            scan,
+            rule_type="vehicle_status_conflict",
+            entity_type="vehicle",
+            entity_id=vehicle.id,
+            severity="high",
+            summary=summary,
+            entity_ref=vehicle.public_ref,
+            related_refs=[
+                *facts.active_booking_refs,
+                *(ref for pair in facts.overlapping_booking_pairs for ref in pair),
+            ],
+            signals=signals,
+        )
+
+
+def _scan_odometer_regressions(
+    db: Session,
+    scan: ScanResult,
+    *,
+    actor_label: str | None,
+    actor_type: str,
+) -> None:
+    # Compare the chronological history with itself rather than every historical reading
+    # to today's canonical value. That detects imported checkout/return/maintenance
+    # regressions without flagging every legitimate older reading.
+    # Runtime checkout/return/maintenance mutations take the vehicle lock before they
+    # inspect or append DQ-03 evidence. Taking the same lock here makes scan-vs-command
+    # check/merge atomic and prevents a partial-unique race for the open issue.
+    vehicles = {
+        v.id: v for v in db.scalars(select(Vehicle).order_by(Vehicle.id).with_for_update()).all()
+    }
+    readings_by_vehicle: dict[uuid.UUID, list[tuple[datetime, str, int, str, str | None]]] = {}
+    inspections = db.scalars(select(Inspection)).all()
+    return_inspection_booking_ids = {
+        inspection.booking_id for inspection in inspections if inspection.type == "return"
+    }
+    returned_bookings = db.scalars(
+        select(Booking).where(Booking.status == "returned", Booking.end_odometer_km.is_not(None))
+    ).all()
+    booking_ref_by_id = {booking.id: booking.public_ref for booking in returned_bookings}
+    for booking in returned_bookings:
+        # A real return inspection owns the actual reading timestamp. Using the booking's
+        # planned ends_at as a duplicate second reading can make an early return appear to
+        # go backwards after a newer real inspection. Keep booking data only as the legacy
+        # import fallback when no return inspection exists.
+        if booking.id in return_inspection_booking_ids:
+            continue
+        assert booking.end_odometer_km is not None
+        readings_by_vehicle.setdefault(booking.vehicle_id, []).append(
+            (
+                booking.ends_at,
+                booking.public_ref,
+                booking.end_odometer_km,
+                "booking",
+                booking.public_ref,
+            )
+        )
+    for inspection in inspections:
+        readings_by_vehicle.setdefault(inspection.vehicle_id, []).append(
+            (
+                inspection.completed_at,
+                inspection.public_ref,
+                inspection.odometer_km,
+                inspection.type,
+                (
+                    booking_ref_by_id.get(inspection.booking_id)
+                    if inspection.type == "return"
+                    else None
+                ),
+            )
+        )
+    for record in db.scalars(select(MaintenanceRecord)).all():
+        readings_by_vehicle.setdefault(record.vehicle_id, []).append(
+            (record.occurred_at, record.public_ref, record.odometer_km, "maintenance", None)
+        )
+
+    for vehicle_id, readings in readings_by_vehicle.items():
+        readings.sort(key=lambda reading: (reading[0], reading[1]))
+        highest = readings[0] if readings else None
+        for later in readings[1:]:
+            assert highest is not None
+            if later[2] < highest[2]:
+                vehicle = vehicles[vehicle_id]
+                had_open_issue = _has_open_issue(
+                    db,
+                    "odometer_regression",
+                    "vehicle",
+                    vehicle_id,
+                )
+                issue = open_odometer_regression_issue(
+                    db,
+                    vehicle=vehicle,
+                    reading_ref=later[1],
+                    reading_km=later[2],
+                    canonical_km=highest[2],
+                    canonical_ref=highest[1],
+                    source_type=later[3],
+                    related_refs=list(
+                        dict.fromkeys(
+                            [highest[1], later[1], *([later[4]] if later[4] is not None else [])]
+                        )
+                    ),
+                    correctable_booking_refs=[later[4]] if later[4] is not None else [],
+                    public_ref=_new_scan_ref("DQ-SCAN"),
+                    actor_label=actor_label,
+                    actor_type=actor_type,
+                )
+                if issue is not None and not had_open_issue:
+                    scan.bump("odometer_regression")
+            if later[2] > highest[2]:
+                highest = later
+
+
+def run_scan(
+    db: Session,
+    *,
+    actor_label: str | None = None,
+    actor_type: str = "user",
+    commit: bool = True,
+) -> ScanResult:
+    # The check-then-insert work below spans several rules. Serialise whole scans at the
+    # database boundary so API and n8n triggers cannot both observe an empty condition.
+    db.scalar(select(func.pg_advisory_xact_lock(DATA_QUALITY_SCAN_LOCK_ID)))
+    scan = ScanResult()
+    scan_duplicate_customers(db, scan, _open_issue)
+    _scan_missing_required_fields(db, scan)
+    _scan_odometer_regressions(
+        db,
+        scan,
+        actor_label=actor_label,
+        actor_type=actor_type,
+    )
+    _scan_booking_overlaps(db, scan)
+    _scan_vehicle_status_conflicts(db, scan)
+    if actor_label is not None:
+        record_audit_event(
+            db,
+            actor_type=actor_type,
+            actor_label=actor_label,
+            action="data_quality_scan_run",
+            entity_type="system",
+            metadata={"created": scan.created},
+        )
+    if commit:
+        db.commit()
+    else:
+        db.flush()
+    return scan
+
+
+def defer_issue(db: Session, public_ref: str, actor: CurrentUser) -> DataQualityIssue:
+    issue = _load_open_issue(db, public_ref)
+    issue.status = "deferred"
+    issue.resolved_at = datetime.now(UTC)
+    issue.resolved_by = actor.display_name
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="data_quality_issue_deferred",
+        entity_type="data_quality_issue",
+        entity_id=issue.id,
+        before={"status": "open"},
+        after={"status": "deferred"},
+    )
+    db.commit()
+    return issue
+
+
+def reject_issue(db: Session, public_ref: str, actor: CurrentUser) -> DataQualityIssue:
+    issue = _load_open_issue(db, public_ref)
+    issue.status = "rejected"
+    issue.resolved_at = datetime.now(UTC)
+    issue.resolved_by = actor.display_name
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="data_quality_issue_rejected",
+        entity_type="data_quality_issue",
+        entity_id=issue.id,
+        before={"status": "open"},
+        after={"status": "rejected"},
+    )
+    db.commit()
+    return issue
+
+
+def provide_missing_fields(
+    db: Session, public_ref: str, fields: dict[str, str], actor: CurrentUser
+) -> DataQualityIssue:
+    issue = _load_open_issue(db, public_ref)
+    if issue.rule_type != "missing_required_field":
+        raise AppError(
+            "NOT_A_MISSING_FIELD_ISSUE",
+            "This issue is not a missing-required-field issue.",
+            status_code=409,
+        )
+
+    entity: Customer | Vehicle | None
+    if issue.entity_type == "customer":
+        entity = db.get(Customer, issue.entity_id)
+        allowed = {*REQUIRED_CUSTOMER_FIELDS, "email", "phone"}
+    elif issue.entity_type == "vehicle":
+        entity = db.get(Vehicle, issue.entity_id)
+        allowed = set(REQUIRED_VEHICLE_FIELDS)
+    else:
+        raise AppError(
+            "UNSUPPORTED_ENTITY",
+            f"Cannot provide fields for entity type '{issue.entity_type}'.",
+            status_code=409,
+        )
+    if entity is None:
+        raise AppError(
+            "ENTITY_NOT_FOUND", "The underlying record could not be found.", status_code=404
+        )
+
+    invalid = set(fields) - allowed
+    if invalid:
+        raise AppError(
+            "INVALID_FIELD",
+            f"Fields not permitted here: {', '.join(sorted(invalid))}.",
+            status_code=422,
+        )
+    if not fields:
+        raise AppError(
+            "NO_FIELDS_PROVIDED", "At least one field must be provided.", status_code=422
+        )
+
+    before = {f: getattr(entity, f) for f in allowed}
+    for field_name, value in fields.items():
+        if not value.strip():
+            raise AppError("EMPTY_VALUE", f"Field '{field_name}' cannot be blank.", status_code=422)
+        setattr(entity, field_name, value.strip())
+    after = {f: getattr(entity, f) for f in allowed}
+
+    correlation_id = uuid.uuid4()
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="data_quality_fields_provided",
+        entity_type=issue.entity_type,
+        entity_id=entity.id,
+        correlation_id=correlation_id,
+        before=before,
+        after=after,
+        metadata={"issue_ref": issue.public_ref},
+    )
+
+    if isinstance(entity, Customer):
+        missing = [f for f in REQUIRED_CUSTOMER_FIELDS if not getattr(entity, f)]
+        if not entity.email and not entity.phone:
+            missing.append("email_or_phone")
+    else:
+        missing = [f for f in REQUIRED_VEHICLE_FIELDS if not getattr(entity, f)]
+
+    if not missing:
+        issue.status = "resolved"
+        issue.resolved_at = datetime.now(UTC)
+        issue.resolved_by = actor.display_name
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_label=actor.display_name,
+            action="data_quality_issue_resolved",
+            entity_type="data_quality_issue",
+            entity_id=issue.id,
+            correlation_id=correlation_id,
+            before={"status": "open"},
+            after={"status": "resolved"},
+        )
+    else:
+        issue.evidence_json = {**issue.evidence_json, "summary": f"Missing: {', '.join(missing)}"}
+
+    db.commit()
+    return issue
+
+
+def resolve_booking_overlap(
+    db: Session, public_ref: str, booking_ref: str, note: str | None, actor: CurrentUser
+) -> DataQualityIssue:
+    issue = _load_open_issue(db, public_ref)
+    if issue.rule_type != "booking_overlap":
+        raise AppError(
+            "NOT_AN_OVERLAP_ISSUE", "This issue is not a booking_overlap issue.", status_code=409
+        )
+    related_refs = issue.evidence_json.get("related_refs", [])
+    if booking_ref not in related_refs:
+        raise AppError(
+            "INVALID_BOOKING_REFERENCE",
+            "booking_ref must be one of this issue's overlapping bookings.",
+            status_code=422,
+        )
+    booking = db.scalar(select(Booking).where(Booking.public_ref == booking_ref).with_for_update())
+    if booking is None:
+        raise AppError("BOOKING_NOT_FOUND", "The booking to block was not found.", status_code=404)
+    if booking.status not in ("reserved", "active"):
+        raise AppError(
+            "BOOKING_NOT_ACTIVE",
+            f"Booking is '{booking.status}'; only a reserved or active booking can be blocked.",
+            status_code=409,
+        )
+
+    before = {"status": booking.status}
+    booking.status = "blocked"
+
+    # Verify the minimal safe resolution actually removed the conflict: no two
+    # reserved/active bookings for this vehicle should still overlap. The session has
+    # autoflush disabled, so exclude the just-blocked booking by id rather than relying
+    # on the in-memory status change being visible to this query.
+    remaining = db.scalars(
+        select(Booking).where(
+            Booking.vehicle_id == booking.vehicle_id,
+            Booking.status.in_(["reserved", "active"]),
+            Booking.public_ref.in_(related_refs),
+            Booking.id != booking.id,
+        )
+    ).all()
+    for i, first in enumerate(remaining):
+        for second in remaining[i + 1 :]:
+            if second.starts_at < first.ends_at and first.starts_at < second.ends_at:
+                raise AppError(
+                    "OVERLAP_STILL_PRESENT",
+                    "Blocking this booking did not remove the overlap; another commitment remains.",
+                    status_code=409,
+                )
+
+    correlation_id = uuid.uuid4()
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="data_quality_booking_blocked",
+        entity_type="booking",
+        entity_id=booking.id,
+        correlation_id=correlation_id,
+        before=before,
+        after={"status": booking.status},
+        metadata={"issue_ref": issue.public_ref, "note": note},
+    )
+
+    issue.status = "resolved"
+    issue.resolved_at = datetime.now(UTC)
+    issue.resolved_by = actor.display_name
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="data_quality_issue_resolved",
+        entity_type="data_quality_issue",
+        entity_id=issue.id,
+        correlation_id=correlation_id,
+        before={"status": "open"},
+        after={"status": "resolved"},
+    )
+    db.commit()
+    return issue
+
+
+def _load_vehicle_status_conflict_issue(
+    db: Session, public_ref: str, *, lock: bool = True
+) -> DataQualityIssue:
+    issue = _load_open_issue(db, public_ref, lock=lock)
+    if issue.rule_type != "vehicle_status_conflict":
+        raise AppError(
+            "NOT_A_STATUS_CONFLICT_ISSUE",
+            "This issue is not a vehicle_status_conflict issue.",
+            status_code=409,
+        )
+    return issue
+
+
+def preview_vehicle_status_recommendation(
+    db: Session, public_ref: str
+) -> tuple[DataQualityIssue, Vehicle, VehicleStatusRecommendation, str]:
+    """Non-mutating: computes and returns the recommendation only. Never resolves the
+    issue, never writes an audit event, never queues automation -- safe to call as often
+    as the UI needs (e.g. every time the panel is opened) with zero side effects."""
+    issue = _load_vehicle_status_conflict_issue(db, public_ref, lock=False)
+    vehicle = db.scalar(select(Vehicle).where(Vehicle.id == issue.entity_id))
+    if vehicle is None:
+        raise AppError(
+            "VEHICLE_NOT_FOUND", "The vehicle for this issue was not found.", status_code=404
+        )
+    facts = gather_vehicle_status_facts(db, vehicle, exclude_issue_id=issue.id)
+    recommendation = evaluate_vehicle_status(vehicle, facts)
+    token = compute_recommendation_token(vehicle, facts)
+    return issue, vehicle, recommendation, token
+
+
+def apply_recommended_status(
+    db: Session, public_ref: str, actor: CurrentUser, expected_token: str
+) -> tuple[DataQualityIssue, str, str]:
+    issue = _load_vehicle_status_conflict_issue(db, public_ref)
+    # Lock the vehicle row for the remainder of this transaction so a concurrent apply
+    # (or return/checkout) can't race between our fact-gathering and the write below.
+    vehicle = db.scalar(select(Vehicle).where(Vehicle.id == issue.entity_id).with_for_update())
+    if vehicle is None:
+        raise AppError(
+            "VEHICLE_NOT_FOUND", "The vehicle for this issue was not found.", status_code=404
+        )
+
+    facts = gather_vehicle_status_facts(db, vehicle, exclude_issue_id=issue.id)
+    recommendation = evaluate_vehicle_status(vehicle, facts)
+    current_token = compute_recommendation_token(vehicle, facts)
+
+    if current_token != expected_token:
+        raise AppError(
+            "RECOMMENDATION_STALE",
+            "The underlying facts changed since this recommendation was shown; "
+            "review the recommendation again before applying it.",
+            status_code=409,
+        )
+    if recommendation.manual_review_required or not recommendation.safe_to_apply:
+        raise AppError(
+            "MANUAL_REVIEW_REQUIRED",
+            "This vehicle's state requires manual review; no automatic status change is safe.",
+            status_code=409,
+        )
+    if recommendation.recommended_status is None:
+        raise AppError(
+            "NO_CONFLICT_DETECTED",
+            "The current vehicle state no longer conflicts; nothing to apply.",
+            status_code=409,
+        )
+    new_status = recommendation.recommended_status
+    reason_code = recommendation.recommendation_code
+
+    before = {"operational_status": vehicle.operational_status}
+    vehicle.operational_status = new_status
+    vehicle.version += 1
+
+    # Re-validate against the same shared evaluator, over freshly-gathered facts, that
+    # applying this change actually leaves no conflict -- never trust the pre-computed
+    # recommendation alone for the post-condition.
+    post_facts = gather_vehicle_status_facts(db, vehicle, exclude_issue_id=issue.id)
+    post_check = evaluate_vehicle_status(vehicle, post_facts)
+    if post_check.recommendation_code not in (RECOMMENDATION_CODE_NO_CONFLICT,):
+        raise AppError(
+            "CONFLICT_STILL_PRESENT",
+            "Applying the recommended status did not resolve the conflict.",
+            status_code=409,
+        )
+
+    correlation_id = uuid.uuid4()
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="data_quality_status_applied",
+        entity_type="vehicle",
+        entity_id=vehicle.id,
+        correlation_id=correlation_id,
+        before=before,
+        after={"operational_status": vehicle.operational_status},
+        metadata={"issue_ref": issue.public_ref, "reason_code": reason_code},
+    )
+
+    issue.status = "resolved"
+    issue.resolved_at = datetime.now(UTC)
+    issue.resolved_by = actor.display_name
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="data_quality_issue_resolved",
+        entity_type="data_quality_issue",
+        entity_id=issue.id,
+        correlation_id=correlation_id,
+        before={"status": "open"},
+        after={"status": "resolved"},
+    )
+    db.commit()
+    return issue, new_status, reason_code
+
+
+MERGEABLE_FIELDS = ("first_name", "last_name", "email", "phone", "postal_code", "city")
+# Mirrors the column lengths in app/models/customer.py so an override can never fail with
+# a database DataError (500) instead of a validation error.
+_MERGEABLE_FIELD_MAX_LENGTH = {
+    "first_name": 80,
+    "last_name": 80,
+    "email": 200,
+    "phone": 40,
+    "postal_code": 20,
+    "city": 120,
+}
+
+
+def merge_customers(
+    db: Session,
+    public_ref: str,
+    survivor_ref: str,
+    field_overrides: dict[str, str] | None,
+    actor: CurrentUser,
+) -> dict:
+    issue = _load_open_issue(db, public_ref)
+    if issue.rule_type != "possible_duplicate_customer":
+        raise AppError(
+            "NOT_A_DUPLICATE_ISSUE",
+            "This issue is not a possible-duplicate-customer issue.",
+            status_code=409,
+        )
+
+    entity_ref = issue.evidence_json.get("entity_ref")
+    related_refs = issue.evidence_json.get("related_refs", [])
+    candidate_refs = {entity_ref, *related_refs}
+    if survivor_ref not in candidate_refs:
+        raise AppError(
+            "INVALID_SURVIVOR",
+            "The survivor reference must be one of the two customers in this issue.",
+            status_code=422,
+            details={"candidates": sorted(candidate_refs)},
+        )
+    loser_ref = next(ref for ref in candidate_refs if ref != survivor_ref)
+
+    # Lock both rows in a deterministic order (by public_ref) so two concurrent merges
+    # touching the same customers serialise instead of deadlocking or double-merging.
+    survivor = None
+    loser = None
+    for ref in sorted((survivor_ref, loser_ref)):
+        customer = db.scalar(select(Customer).where(Customer.public_ref == ref).with_for_update())
+        if ref == survivor_ref:
+            survivor = customer
+        else:
+            loser = customer
+    if survivor is None or loser is None:
+        raise AppError(
+            "CUSTOMER_NOT_FOUND", "One of the customers could not be found.", status_code=404
+        )
+    if survivor.merged_into_customer_id is not None or loser.merged_into_customer_id is not None:
+        raise AppError(
+            "CUSTOMER_ALREADY_MERGED",
+            "One of the customers has already been merged into another record.",
+            status_code=409,
+        )
+
+    before = {
+        "survivor": {f: getattr(survivor, f) for f in MERGEABLE_FIELDS},
+        "loser": {f: getattr(loser, f) for f in MERGEABLE_FIELDS},
+    }
+
+    for field_name, value in (field_overrides or {}).items():
+        if field_name not in MERGEABLE_FIELDS:
+            raise AppError(
+                "INVALID_FIELD_OVERRIDE", f"Field '{field_name}' cannot be merged.", status_code=422
+            )
+        cleaned = value.strip() if isinstance(value, str) else value
+        max_length = _MERGEABLE_FIELD_MAX_LENGTH[field_name]
+        if not cleaned or len(cleaned) > max_length:
+            raise AppError(
+                "INVALID_FIELD_OVERRIDE",
+                f"Field '{field_name}' must be 1 to {max_length} characters.",
+                status_code=422,
+            )
+        setattr(survivor, field_name, cleaned)
+
+    rewired = db.execute(
+        update(Booking).where(Booking.customer_id == loser.id).values(customer_id=survivor.id)
+    )
+    rewired_count: int = rewired.rowcount  # type: ignore[attr-defined]
+    loser.merged_into_customer_id = survivor.id
+
+    issue.status = "resolved"
+    issue.resolved_at = datetime.now(UTC)
+    issue.resolved_by = actor.display_name
+
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="customer_merged",
+        entity_type="customer",
+        entity_id=survivor.id,
+        before=before,
+        after={"survivor": {f: getattr(survivor, f) for f in MERGEABLE_FIELDS}},
+        metadata={
+            "loser_ref": loser_ref,
+            "survivor_ref": survivor_ref,
+            "rewired_bookings": rewired_count,
+        },
+    )
+    db.commit()
+
+    return {
+        "issue_ref": issue.public_ref,
+        "survivor_ref": survivor_ref,
+        "loser_ref": loser_ref,
+        "rewired_bookings": rewired_count,
+    }

backend/app/services/data_quality_common.py

@@ -0,0 +1,59 @@
+from __future__ import annotations
+
+import uuid
+from datetime import datetime, timedelta
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.core.errors import AppError
+from app.models.data_quality import DataQualityIssue
+
+
+def issue_due_at(detected_at: datetime, severity: str) -> datetime:
+    """Return the local operational SLA deadline for a newly detected issue."""
+    return detected_at + {
+        "high": timedelta(hours=4),
+        "medium": timedelta(days=1),
+        "low": timedelta(days=3),
+    }.get(severity, timedelta(days=1))
+
+
+def has_open_issue(
+    db: Session,
+    rule_type: str,
+    entity_type: str,
+    entity_id: uuid.UUID,
+) -> bool:
+    return (
+        db.scalar(
+            select(DataQualityIssue.id).where(
+                DataQualityIssue.rule_type == rule_type,
+                DataQualityIssue.entity_type == entity_type,
+                DataQualityIssue.entity_id == entity_id,
+                DataQualityIssue.status == "open",
+            )
+        )
+        is not None
+    )
+
+
+def new_scan_ref(prefix: str) -> str:
+    """Generate a stable human-readable prefix with a concurrent-safe suffix."""
+    return f"{prefix}-{uuid.uuid4().hex[:10].upper()}"
+
+
+def load_open_issue(db: Session, public_ref: str, *, lock: bool = True) -> DataQualityIssue:
+    statement = select(DataQualityIssue).where(DataQualityIssue.public_ref == public_ref)
+    if lock:
+        statement = statement.with_for_update().execution_options(populate_existing=True)
+    issue = db.scalar(statement)
+    if issue is None:
+        raise AppError("ISSUE_NOT_FOUND", "Data quality issue not found.", status_code=404)
+    if issue.status != "open":
+        raise AppError(
+            "ISSUE_NOT_OPEN",
+            f"Issue is '{issue.status}', not 'open'.",
+            status_code=409,
+        )
+    return issue

backend/app/services/data_quality_duplicate_scan.py

@@ -0,0 +1,108 @@
+from __future__ import annotations
+
+import uuid
+from difflib import SequenceMatcher
+from typing import Protocol, TypeVar
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.models.customer import Customer
+
+DUPLICATE_THRESHOLD = 70
+
+
+class ScanAccumulator(Protocol):
+    def bump(self, rule_type: str) -> None: ...
+
+
+ScanTypeContra = TypeVar("ScanTypeContra", bound=ScanAccumulator, contravariant=True)
+
+
+class OpenIssue(Protocol[ScanTypeContra]):
+    def __call__(
+        self,
+        db: Session,
+        scan: ScanTypeContra,
+        *,
+        rule_type: str,
+        entity_type: str,
+        entity_id: uuid.UUID,
+        severity: str,
+        summary: str,
+        entity_ref: str,
+        related_refs: list[str],
+        signals: list[dict] | None = None,
+    ) -> None: ...
+
+
+def _normalize(value: str | None) -> str:
+    return (value or "").strip().lower()
+
+
+def scan_duplicate_customers[ScanType: ScanAccumulator](
+    db: Session, scan: ScanType, open_issue: OpenIssue[ScanType]
+) -> None:
+    customers = list(
+        db.scalars(
+            select(Customer).where(
+                Customer.merged_into_customer_id.is_(None),
+                Customer.anonymized_at.is_(None),
+            )
+        ).all()
+    )
+    customers.sort(key=lambda customer: customer.public_ref)
+
+    # The threshold cannot be reached without an exact email (60 points) or phone
+    # (50 points). Block on normalized identifiers so this remains linear for the
+    # overwhelmingly common case and only scores plausible pairs.
+    candidate_pairs: set[tuple[int, int]] = set()
+    for attribute in ("email", "phone"):
+        blocks: dict[str, list[int]] = {}
+        for index, customer in enumerate(customers):
+            key = _normalize(getattr(customer, attribute))
+            if key:
+                blocks.setdefault(key, []).append(index)
+        for indices in blocks.values():
+            for offset, left in enumerate(indices):
+                candidate_pairs.update((left, right) for right in indices[offset + 1 :])
+
+    for left, right in sorted(candidate_pairs):
+        a = customers[left]
+        b = customers[right]
+        score = 0
+        signals: list[dict] = []
+        summary_parts: list[str] = []
+        if _normalize(a.email) and _normalize(a.email) == _normalize(b.email):
+            score += 60
+            signals.append({"code": "duplicate.exact_email"})
+            summary_parts.append("exact email")
+        if _normalize(a.phone) and _normalize(a.phone) == _normalize(b.phone):
+            score += 50
+            signals.append({"code": "duplicate.exact_phone"})
+            summary_parts.append("exact phone")
+        if _normalize(a.postal_code) and _normalize(a.postal_code) == _normalize(b.postal_code):
+            score += 10
+            signals.append({"code": "duplicate.same_postal_code"})
+            summary_parts.append("exact postal code")
+        name_a = f"{_normalize(a.first_name)} {_normalize(a.last_name)}"
+        name_b = f"{_normalize(b.first_name)} {_normalize(b.last_name)}"
+        ratio = SequenceMatcher(None, name_a, name_b).ratio()
+        if ratio >= 0.5:
+            score += round(ratio * 30)
+            signals.append({"code": "duplicate.similar_name", "params": {"score": round(ratio, 2)}})
+            summary_parts.append("similar name")
+
+        if score >= DUPLICATE_THRESHOLD:
+            open_issue(
+                db,
+                scan,
+                rule_type="possible_duplicate_customer",
+                entity_type="customer",
+                entity_id=a.id,
+                severity="high",
+                summary="; ".join(summary_parts) + f" (score {score})",
+                entity_ref=a.public_ref,
+                related_refs=[b.public_ref],
+                signals=signals,
+            )

backend/app/services/data_quality_odometer.py

@@ -0,0 +1,507 @@
+from __future__ import annotations
+
+import uuid
+from datetime import UTC, datetime
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.core.errors import AppError
+from app.models.booking import Booking
+from app.models.data_quality import DataQualityIssue
+from app.models.inspection import Inspection
+from app.models.vehicle import Vehicle
+from app.schemas import CurrentUser, ResolveOdometerRegressionRequest
+from app.services.audit import record_audit_event
+from app.services.data_quality_common import issue_due_at, load_open_issue, new_scan_ref
+
+
+def _odometer_fingerprint(
+    *,
+    source_type: str,
+    later_ref: str,
+    later_km: int,
+) -> dict[str, str | int]:
+    """Stable identity for one reviewed regression, independent of issue IDs."""
+    return {
+        "source_type": source_type,
+        "later_ref": later_ref,
+        "later_km": later_km,
+    }
+
+
+def _was_odometer_regression_retained(
+    db: Session,
+    *,
+    vehicle_id: uuid.UUID,
+    fingerprint: dict[str, str | int],
+) -> bool:
+    reviewed = db.scalars(
+        select(DataQualityIssue).where(
+            DataQualityIssue.rule_type == "odometer_regression",
+            DataQualityIssue.entity_type == "vehicle",
+            DataQualityIssue.entity_id == vehicle_id,
+            DataQualityIssue.status == "resolved",
+        )
+    ).all()
+    return any(
+        issue.evidence_json.get("resolution_decision") == "retain_canonical"
+        and fingerprint in issue.evidence_json.get("retained_odometer_fingerprints", [])
+        for issue in reviewed
+    )
+
+
+def open_odometer_regression_issue(
+    db: Session,
+    *,
+    vehicle: Vehicle,
+    reading_ref: str,
+    reading_km: int,
+    canonical_km: int,
+    source_type: str,
+    related_refs: list[str],
+    correctable_booking_refs: list[str] | None = None,
+    canonical_ref: str | None = None,
+    detected_at: datetime | None = None,
+    public_ref: str | None = None,
+    actor_label: str | None = None,
+    actor_type: str = "user",
+    correlation_id: uuid.UUID | None = None,
+) -> DataQualityIssue | None:
+    """Open one explainable DQ-03 issue while the caller holds the vehicle lock."""
+    if reading_km >= canonical_km:
+        return None
+    earlier_ref = canonical_ref or vehicle.public_ref
+    fingerprint = _odometer_fingerprint(
+        source_type=source_type,
+        later_ref=reading_ref,
+        later_km=reading_km,
+    )
+    # A manager's explicit "retain canonical" decision acknowledges this exact source
+    # fact. Reopening it on every scheduled scan would create churn; only changed or new
+    # evidence (and therefore a different fingerprint) is actionable again.
+    if _was_odometer_regression_retained(
+        db,
+        vehicle_id=vehicle.id,
+        fingerprint=fingerprint,
+    ):
+        return None
+    existing = db.scalar(
+        select(DataQualityIssue)
+        .where(
+            DataQualityIssue.rule_type == "odometer_regression",
+            DataQualityIssue.entity_type == "vehicle",
+            DataQualityIssue.entity_id == vehicle.id,
+            DataQualityIssue.status == "open",
+        )
+        .with_for_update()
+        .execution_options(populate_existing=True)
+    )
+    if existing is not None:
+        before_related_refs = list(existing.evidence_json.get("related_refs", []))
+        before_correctable_refs = list(existing.evidence_json.get("correctable_booking_refs", []))
+        new_signal = {
+            "code": "odometer.regression",
+            "source_type": source_type,
+            "params": {
+                "later_ref": reading_ref,
+                "later_km": reading_km,
+                "earlier_ref": earlier_ref,
+                "earlier_km": canonical_km,
+            },
+        }
+        existing_signals = list(existing.evidence_json.get("signals", []))
+        signal_was_new = not any(
+            isinstance(signal, dict)
+            and isinstance(signal.get("params"), dict)
+            and _odometer_fingerprint(
+                source_type=str(
+                    signal.get("source_type", existing.evidence_json.get("source_type"))
+                ),
+                later_ref=str(signal["params"].get("later_ref")),
+                later_km=signal["params"].get("later_km"),
+            )
+            == fingerprint
+            for signal in existing_signals
+            if isinstance(signal, dict)
+            and isinstance(signal.get("params"), dict)
+            and isinstance(signal["params"].get("later_km"), int)
+        )
+        if signal_was_new:
+            existing_signals.append(new_signal)
+        merged_related_refs = list(
+            dict.fromkeys([*before_related_refs, *(related_refs if signal_was_new else [])])
+        )
+        merged_correctable_refs = list(
+            dict.fromkeys([*before_correctable_refs, *(correctable_booking_refs or [])])
+        )
+        if (
+            not signal_was_new
+            and merged_related_refs == before_related_refs
+            and merged_correctable_refs == before_correctable_refs
+        ):
+            return existing
+        source_types = list(existing.evidence_json.get("source_types", []))
+        previous_source_type = existing.evidence_json.get("source_type")
+        if (
+            isinstance(previous_source_type, str)
+            and previous_source_type != "multiple"
+            and previous_source_type not in source_types
+        ):
+            source_types.append(previous_source_type)
+        if source_type not in source_types:
+            source_types.append(source_type)
+        existing.evidence_json = {
+            **existing.evidence_json,
+            "summary": (
+                f"{source_type.title()} {reading_ref} recorded {reading_km} km, below "
+                f"the canonical {canonical_km} km for {vehicle.public_ref}."
+            ),
+            "related_refs": merged_related_refs,
+            "correctable_booking_refs": merged_correctable_refs,
+            "source_type": source_type if len(source_types) == 1 else "multiple",
+            "source_types": source_types,
+            "signals": existing_signals,
+        }
+        if actor_label is not None and (
+            merged_related_refs != before_related_refs
+            or merged_correctable_refs != before_correctable_refs
+            or signal_was_new
+        ):
+            record_audit_event(
+                db,
+                actor_type=actor_type,
+                actor_label=actor_label,
+                action="data_quality_issue_evidence_updated",
+                entity_type="data_quality_issue",
+                entity_id=existing.id,
+                correlation_id=correlation_id,
+                before={
+                    "related_refs": before_related_refs,
+                    "correctable_booking_refs": before_correctable_refs,
+                },
+                after={
+                    "related_refs": merged_related_refs,
+                    "correctable_booking_refs": merged_correctable_refs,
+                },
+                metadata={"vehicle_ref": vehicle.public_ref, "reading_ref": reading_ref},
+            )
+        return existing
+    now = detected_at or datetime.now(UTC)
+    previous = db.scalar(
+        select(DataQualityIssue)
+        .where(
+            DataQualityIssue.rule_type == "odometer_regression",
+            DataQualityIssue.entity_type == "vehicle",
+            DataQualityIssue.entity_id == vehicle.id,
+            DataQualityIssue.status != "open",
+        )
+        .order_by(DataQualityIssue.detected_at.desc())
+    )
+    evidence = {
+        "summary": (
+            f"{source_type.title()} {reading_ref} recorded {reading_km} km, below "
+            f"the canonical {canonical_km} km for {vehicle.public_ref}."
+        ),
+        "entity_ref": vehicle.public_ref,
+        "related_refs": related_refs,
+        "correctable_booking_refs": correctable_booking_refs or [],
+        "source_type": source_type,
+        "source_types": [source_type],
+        "signals": [
+            {
+                "code": "odometer.regression",
+                "source_type": source_type,
+                "params": {
+                    "later_ref": reading_ref,
+                    "later_km": reading_km,
+                    "earlier_ref": earlier_ref,
+                    "earlier_km": canonical_km,
+                },
+            }
+        ],
+    }
+    if previous is not None:
+        evidence["reopened_from"] = previous.public_ref
+        evidence["previous_decision"] = previous.status
+    issue = DataQualityIssue(
+        public_ref=public_ref or new_scan_ref("DQ-ODO"),
+        rule_type="odometer_regression",
+        entity_type="vehicle",
+        entity_id=vehicle.id,
+        severity="medium",
+        status="open",
+        evidence_json=evidence,
+        proposed_action_json={},
+        detected_at=now,
+        due_at=issue_due_at(now, "medium"),
+    )
+    db.add(issue)
+    db.flush()
+    if actor_label is not None:
+        record_audit_event(
+            db,
+            actor_type=actor_type,
+            actor_label=actor_label,
+            action="data_quality_issue_created",
+            entity_type="data_quality_issue",
+            entity_id=issue.id,
+            correlation_id=correlation_id,
+            after={"status": "open", "rule_type": "odometer_regression"},
+            metadata={"vehicle_ref": vehicle.public_ref, "reading_ref": reading_ref},
+        )
+    return issue
+
+
+def resolve_odometer_regression(
+    db: Session, public_ref: str, body: ResolveOdometerRegressionRequest, actor: CurrentUser
+) -> DataQualityIssue:
+    # Read the routing data without a row lock first. The canonical mutation order is
+    # booking -> vehicle -> issue -> inspection everywhere, matching checkout/return.
+    # Locking the issue before the booking creates a resolver-vs-return deadlock.
+    issue_snapshot = load_open_issue(db, public_ref, lock=False)
+    if issue_snapshot.rule_type != "odometer_regression":
+        raise AppError(
+            "NOT_AN_ODOMETER_ISSUE",
+            "This issue is not an odometer_regression issue.",
+            status_code=409,
+        )
+
+    def correctable_refs(issue: DataQualityIssue) -> list[str]:
+        if "correctable_booking_refs" in issue.evidence_json:
+            refs = issue.evidence_json.get("correctable_booking_refs", [])
+        else:
+            # Backward compatibility for issues created before source-aware evidence.
+            refs = [
+                ref
+                for ref in issue.evidence_json.get("related_refs", [])
+                if isinstance(ref, str) and ref.startswith("BK-")
+            ]
+        return [ref for ref in refs if isinstance(ref, str)]
+
+    booking: Booking | None = None
+    if body.decision != "retain_canonical":
+        if body.booking_ref not in correctable_refs(issue_snapshot):
+            raise AppError(
+                "INVALID_BOOKING_REFERENCE",
+                "booking_ref must be one of this issue's related bookings.",
+                status_code=422,
+            )
+        if body.corrected_odometer_km is None:
+            raise AppError(
+                "CORRECTED_VALUE_REQUIRED",
+                "corrected_odometer_km is required when correcting a reading.",
+                status_code=422,
+            )
+        booking = db.scalar(
+            select(Booking).where(Booking.public_ref == body.booking_ref).with_for_update()
+        )
+        if booking is None:
+            raise AppError(
+                "BOOKING_NOT_FOUND", "The booking to correct was not found.", status_code=404
+            )
+    vehicle = db.scalar(
+        select(Vehicle).where(Vehicle.id == issue_snapshot.entity_id).with_for_update()
+    )
+    if vehicle is None:
+        raise AppError(
+            "VEHICLE_NOT_FOUND", "The vehicle for this issue was not found.", status_code=404
+        )
+
+    # A return or scan may have appended evidence while we waited for the domain locks.
+    # Lock and refresh the issue only now, then revalidate every decision against that
+    # current evidence instead of resolving a stale snapshot.
+    issue = load_open_issue(db, public_ref)
+    if issue.rule_type != "odometer_regression" or issue.entity_id != vehicle.id:
+        raise AppError(
+            "ISSUE_CHANGED",
+            "The issue changed while the correction was being prepared. Review it again.",
+            status_code=409,
+        )
+    if booking is not None:
+        if booking.vehicle_id != vehicle.id or booking.public_ref not in correctable_refs(issue):
+            raise AppError(
+                "INVALID_BOOKING_REFERENCE",
+                "booking_ref must be one of this issue's related bookings.",
+                status_code=422,
+            )
+
+    correlation_id = uuid.uuid4()
+
+    if body.decision == "retain_canonical":
+        retained_fingerprints: list[dict[str, str | int]] = []
+        fallback_source_type = str(issue.evidence_json.get("source_type", "unknown"))
+        for signal in issue.evidence_json.get("signals", []):
+            if not isinstance(signal, dict) or signal.get("code") != "odometer.regression":
+                continue
+            params = signal.get("params")
+            if not isinstance(params, dict):
+                continue
+            source_type = signal.get("source_type", fallback_source_type)
+            later_ref = params.get("later_ref")
+            later_km = params.get("later_km")
+            earlier_ref = params.get("earlier_ref")
+            earlier_km = params.get("earlier_km")
+            if (
+                isinstance(source_type, str)
+                and isinstance(later_ref, str)
+                and isinstance(later_km, int)
+                and isinstance(earlier_ref, str)
+                and isinstance(earlier_km, int)
+            ):
+                retained_fingerprints.append(
+                    _odometer_fingerprint(
+                        source_type=source_type,
+                        later_ref=later_ref,
+                        later_km=later_km,
+                    )
+                )
+        issue.evidence_json = {
+            **issue.evidence_json,
+            "resolution_decision": "retain_canonical",
+            "retained_odometer_fingerprints": retained_fingerprints,
+        }
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_label=actor.display_name,
+            action="data_quality_odometer_retained",
+            entity_type="vehicle",
+            entity_id=vehicle.id,
+            correlation_id=correlation_id,
+            metadata={
+                "issue_ref": issue.public_ref,
+                "canonical_odometer_km": vehicle.odometer_km,
+                "retained_fingerprint_count": len(retained_fingerprints),
+            },
+        )
+    else:
+        assert booking is not None and body.corrected_odometer_km is not None
+        # Never silently lower the canonical odometer: a correction must be at or above
+        # the current canonical value, otherwise it would just create a new regression.
+        if body.corrected_odometer_km < vehicle.odometer_km:
+            raise AppError(
+                "CORRECTION_BELOW_CANONICAL",
+                (
+                    f"Corrected value {body.corrected_odometer_km} km is still below the "
+                    f"canonical {vehicle.odometer_km} km; it would not resolve the regression."
+                ),
+                status_code=422,
+            )
+
+        # A returned booking has two persisted representations of the same reading.
+        # Correct every return inspection for the selected booking, including historical
+        # seed rows whose old issue evidence did not yet cite the inspection explicitly.
+        related_inspections = db.scalars(
+            select(Inspection)
+            .where(Inspection.booking_id == booking.id, Inspection.type == "return")
+            .with_for_update()
+        ).all()
+        before = {
+            "booking_end_odometer_km": booking.end_odometer_km,
+            "vehicle_odometer_km": vehicle.odometer_km,
+            "inspection_odometer_km": {
+                inspection.public_ref: inspection.odometer_km for inspection in related_inspections
+            },
+        }
+        booking.end_odometer_km = body.corrected_odometer_km
+        for inspection in related_inspections:
+            inspection.odometer_km = body.corrected_odometer_km
+        vehicle.odometer_km = body.corrected_odometer_km
+        vehicle.version += 1
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_label=actor.display_name,
+            action="data_quality_odometer_corrected",
+            entity_type="vehicle",
+            entity_id=vehicle.id,
+            correlation_id=correlation_id,
+            before=before,
+            after={
+                "booking_end_odometer_km": booking.end_odometer_km,
+                "vehicle_odometer_km": vehicle.odometer_km,
+                "inspection_odometer_km": {
+                    inspection.public_ref: inspection.odometer_km
+                    for inspection in related_inspections
+                },
+            },
+            metadata={"issue_ref": issue.public_ref, "booking_ref": booking.public_ref},
+        )
+
+    has_remaining_evidence = False
+    if booking is not None:
+        target_refs = {booking.public_ref, *(item.public_ref for item in related_inspections)}
+        before_related = [
+            ref for ref in issue.evidence_json.get("related_refs", []) if isinstance(ref, str)
+        ]
+        before_correctable = correctable_refs(issue)
+        before_signals = [
+            signal for signal in issue.evidence_json.get("signals", []) if isinstance(signal, dict)
+        ]
+        remaining_signals = [
+            signal
+            for signal in before_signals
+            if not (
+                isinstance(signal.get("params"), dict)
+                and signal["params"].get("later_ref") in target_refs
+            )
+        ]
+        remaining_related = [ref for ref in before_related if ref not in target_refs]
+        remaining_correctable = [ref for ref in before_correctable if ref != booking.public_ref]
+        has_remaining_evidence = bool(remaining_signals or remaining_correctable)
+        issue.evidence_json = {
+            **issue.evidence_json,
+            "summary": (
+                "Additional odometer regression evidence remains for review."
+                if has_remaining_evidence
+                else issue.evidence_json.get("summary", "Odometer reading corrected.")
+            ),
+            "related_refs": remaining_related,
+            "correctable_booking_refs": remaining_correctable,
+            "signals": remaining_signals,
+        }
+        if has_remaining_evidence:
+            record_audit_event(
+                db,
+                actor_type="user",
+                actor_label=actor.display_name,
+                action="data_quality_issue_partially_resolved",
+                entity_type="data_quality_issue",
+                entity_id=issue.id,
+                correlation_id=correlation_id,
+                before={
+                    "related_refs": before_related,
+                    "correctable_booking_refs": before_correctable,
+                    "signal_count": len(before_signals),
+                },
+                after={
+                    "related_refs": remaining_related,
+                    "correctable_booking_refs": remaining_correctable,
+                    "signal_count": len(remaining_signals),
+                },
+                metadata={
+                    "decision": body.decision,
+                    "booking_ref": booking.public_ref,
+                    "note": body.note,
+                },
+            )
+
+    if not has_remaining_evidence:
+        issue.status = "resolved"
+        issue.resolved_at = datetime.now(UTC)
+        issue.resolved_by = actor.display_name
+        record_audit_event(
+            db,
+            actor_type="user",
+            actor_label=actor.display_name,
+            action="data_quality_issue_resolved",
+            entity_type="data_quality_issue",
+            entity_id=issue.id,
+            correlation_id=correlation_id,
+            before={"status": "open"},
+            after={"status": "resolved"},
+            metadata={"decision": body.decision, "note": body.note},
+        )
+    db.commit()
+    return issue

backend/app/services/demo_manifest.py

@@ -0,0 +1,220 @@
+from __future__ import annotations
+
+from datetime import datetime
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.core.config import get_settings
+from app.models.audit import AuditEvent
+from app.models.booking import Booking
+from app.models.data_quality import DataQualityIssue
+from app.models.outbox import OutboxEvent, is_demo_scenario_failure
+from app.schemas import DemoIntegrationSummaryOut, DemoManifestOut, DemoScenarioOut
+from app.services.integration_status import derive_mcp_hub_status, derive_n8n_status
+from app.services.knowledge import KnowledgeHealth, get_knowledge_provider
+
+settings = get_settings()
+
+_FAILED_DEMO_EVENT_ID = "00000000-0000-4000-8000-000000000020"
+
+
+def _knowledge_scenario_ready(health: KnowledgeHealth) -> bool:
+    """Require a reachable provider and independently verified indexed documents.
+
+    ``source_document_count`` describes local Markdown files, while a sync report only
+    describes an upload attempt. Neither proves that the active provider can retrieve a
+    corpus, so an unavailable verification count remains honestly not ready.
+    """
+    return bool(
+        health.available and health.document_count is not None and health.document_count > 0
+    )
+
+
+def _last_reset(db: Session) -> tuple[datetime | None, str | None]:
+    marker = db.scalar(
+        select(AuditEvent)
+        .where(AuditEvent.action == "demo_data_seeded")
+        .order_by(AuditEvent.occurred_at.desc())
+    )
+    if marker is None:
+        return None, None
+    metadata = marker.metadata_json or {}
+    return marker.occurred_at, metadata.get("anchor_date")
+
+
+def _scenarios(db: Session) -> list[DemoScenarioOut]:
+    booking = db.scalar(select(Booking).where(Booking.public_ref == "BK-DEMO-RETURN"))
+    duplicate_issue = db.scalar(
+        select(DataQualityIssue).where(DataQualityIssue.public_ref == "DQ-DEMO-DUPLICATE")
+    )
+    overlap_issue = db.scalar(
+        select(DataQualityIssue).where(DataQualityIssue.public_ref == "DQ-DEMO-OVERLAP")
+    )
+    failed_run = db.scalar(select(OutboxEvent).where(OutboxEvent.event_id == _FAILED_DEMO_EVENT_ID))
+    knowledge_health = get_knowledge_provider().health()
+
+    # Human copy (title, problem statement, "demonstrates" summary) lives entirely in the
+    # frontend's demo.json (scenarios.items.<id>.*) so it's available in all three UI
+    # languages. This service only emits stable identifiers and message codes -- never
+    # display prose -- per the message_code + params architecture used across the app.
+    return_ready = bool(booking and booking.status == "active" and booking.end_odometer_km is None)
+    duplicate_ready = bool(duplicate_issue and duplicate_issue.status == "open")
+    overlap_ready = bool(overlap_issue and overlap_issue.status == "open")
+    automation_ready = bool(failed_run and is_demo_scenario_failure(failed_run))
+    knowledge_ready = _knowledge_scenario_ready(knowledge_health)
+
+    return [
+        DemoScenarioOut(
+            id="return-anomaly",
+            estimated_minutes=3,
+            required_roles=["rental_employee", "operations_manager"],
+            start_path=f"/bookings/{booking.public_ref}" if booking else "/bookings",
+            ready=return_ready,
+            blocked_reason_code=(
+                None
+                if return_ready
+                else "bookingNotFound"
+                if booking is None
+                else "bookingAlreadyProcessed"
+            ),
+        ),
+        DemoScenarioOut(
+            id="duplicate-customer",
+            estimated_minutes=3,
+            required_roles=["operations_manager"],
+            start_path=(
+                f"/data-quality/{duplicate_issue.public_ref}"
+                if duplicate_issue
+                else "/data-quality"
+            ),
+            ready=duplicate_ready,
+            blocked_reason_code=(
+                None
+                if duplicate_ready
+                else "duplicateIssueNotFound"
+                if duplicate_issue is None
+                else "issueAlreadyResolved"
+            ),
+        ),
+        DemoScenarioOut(
+            id="booking-overlap",
+            estimated_minutes=2,
+            required_roles=["operations_manager"],
+            start_path=(
+                f"/data-quality/{overlap_issue.public_ref}" if overlap_issue else "/data-quality"
+            ),
+            ready=overlap_ready,
+            blocked_reason_code=(
+                None
+                if overlap_ready
+                else "overlapIssueNotFound"
+                if overlap_issue is None
+                else "issueAlreadyResolved"
+            ),
+        ),
+        DemoScenarioOut(
+            id="automation-retry",
+            estimated_minutes=2,
+            required_roles=["operations_manager"],
+            start_path="/automation",
+            ready=automation_ready,
+            blocked_reason_code=(
+                None
+                if automation_ready
+                else "failedEventNotFound"
+                if failed_run is None
+                else "eventAlreadyRecovered"
+            ),
+        ),
+        DemoScenarioOut(
+            id="knowledge-question",
+            estimated_minutes=2,
+            required_roles=["rental_employee", "operations_manager"],
+            start_path="/knowledge",
+            ready=knowledge_ready,
+            blocked_reason_code=None if knowledge_ready else "knowledgeUnavailable",
+        ),
+    ]
+
+
+def _integrations(db: Session) -> list[DemoIntegrationSummaryOut]:
+    n8n = derive_n8n_status(db)
+    knowledge_health = get_knowledge_provider().health()
+    mcp_hub = derive_mcp_hub_status(db)
+
+    return [
+        DemoIntegrationSummaryOut(
+            key="n8n",
+            status_code=n8n.state,
+            detail_code="n8nDetail",
+            detail_params={
+                "succeeded": n8n.succeeded,
+                "failed": n8n.failed,
+                "pending": n8n.pending,
+            },
+        ),
+        DemoIntegrationSummaryOut(
+            key="ragcore",
+            status_code=(
+                "operational"
+                if knowledge_health.provider == "ragcore"
+                and _knowledge_scenario_ready(knowledge_health)
+                else "demoMode"
+                if knowledge_health.provider == "demo"
+                and _knowledge_scenario_ready(knowledge_health)
+                else "unavailable"
+            ),
+            detail_code=(
+                "ragcoreDetail"
+                if knowledge_health.document_count is not None
+                else "ragcoreSourceDetail"
+            ),
+            detail_params={
+                "count": knowledge_health.document_count or 0,
+                "source_count": knowledge_health.source_document_count,
+                "collection": knowledge_health.collection,
+            },
+        ),
+        DemoIntegrationSummaryOut(
+            key="mcp_hub",
+            # `MCP_HUB_REGISTRATION_ENABLED` on its own proves nothing: registration is
+            # catalog-driven on the Hub's side, so the flag only says Fleet Ops expects
+            # to be called. Only real recorded `mcp_tool_request` calls make this
+            # "operational" -- same evidence rule the integration status page uses.
+            status_code="operational" if mcp_hub.state == "operational" else "notConnected",
+            detail_code=(
+                "mcpDetailOperational" if mcp_hub.state == "operational" else "mcpDetailPrepared"
+            ),
+            detail_params={},
+        ),
+    ]
+
+
+def scenario_integrity_report(db: Session) -> dict:
+    """Server-side scenario-integrity check run after every reset (section 15): confirms
+    each of the 5 named scenarios is actually present and ready, rather than trusting the
+    seed loader silently. Reuses the same readiness derivation the manifest/scenario
+    overview already use, so this can never drift from what a visitor actually sees."""
+    scenarios = _scenarios(db)
+    not_ready = [
+        {"id": s.id, "reason_code": s.blocked_reason_code} for s in scenarios if not s.ready
+    ]
+    return {"all_ready": len(not_ready) == 0, "not_ready": not_ready}
+
+
+def build_demo_manifest(db: Session) -> DemoManifestOut:
+    last_reset_at, anchor_date = _last_reset(db)
+    return DemoManifestOut(
+        demo_mode=settings.mobilityops_demo_mode,
+        organization_name=settings.demo_organization_name,
+        timezone=settings.demo_timezone,
+        synthetic_data=True,
+        allow_reset=settings.demo_allow_reset,
+        last_reset_at=last_reset_at,
+        anchor_date=anchor_date,
+        guide_available=True,
+        required_roles=["operations_manager", "rental_employee"],
+        scenarios=_scenarios(db),
+        integrations=_integrations(db),
+    )

backend/app/services/dispatcher.py

@@ -0,0 +1,262 @@
+from __future__ import annotations
+
+import logging
+import threading
+import uuid
+from datetime import UTC, datetime, timedelta
+
+import httpx
+from sqlalchemy import select
+
+from app.core.config import get_settings
+from app.core.db import SessionLocal
+from app.models.outbox import OutboxEvent
+
+logger = logging.getLogger("mobilityops.dispatcher")
+settings = get_settings()
+
+_stop_event = threading.Event()
+
+
+def _backoff_seconds(attempts: int) -> int:
+    return min(2**attempts, 60)
+
+
+def _reclaim_stale_deliveries(batch_size: int = 10) -> int:
+    """Recover events stuck in 'delivering' because the process that claimed them died
+    before recording an outcome. Only leases whose deadline has passed are touched, so an
+    in-flight delivery from a still-alive worker is never disturbed or double-processed;
+    `attempts` is preserved so the count reflects true history."""
+    db = SessionLocal()
+    try:
+        now = datetime.now(UTC)
+        rows = db.scalars(
+            select(OutboxEvent)
+            .where(
+                OutboxEvent.delivery_status == "delivering",
+                OutboxEvent.next_attempt_at.is_not(None),
+                OutboxEvent.next_attempt_at <= now,
+            )
+            .limit(batch_size)
+            .with_for_update(skip_locked=True)
+        ).all()
+        for row in rows:
+            row.delivery_status = "pending"
+            row.next_attempt_at = None
+            row.last_error = (
+                "Recovered from a stale 'delivering' lease "
+                f"(no outcome recorded within {settings.n8n_delivery_lease_seconds:.0f}s; "
+                f"the process likely crashed mid-delivery). attempts preserved at {row.attempts}."
+            )[:2000]
+            row.last_error_code = "staleLeaseRecovered"
+        db.commit()
+        return len(rows)
+    finally:
+        db.close()
+
+
+def _claim_due_events(batch_size: int = 5) -> list[uuid.UUID]:
+    """Claim a batch of due events with a short-lived transaction (no network I/O held open).
+    Each claimed row gets a lease deadline (next_attempt_at) so a crash between this claim
+    and the outcome being recorded is recoverable by _reclaim_stale_deliveries."""
+    db = SessionLocal()
+    try:
+        now = datetime.now(UTC)
+        rows = db.scalars(
+            select(OutboxEvent)
+            .where(
+                OutboxEvent.delivery_status == "pending",
+                (OutboxEvent.next_attempt_at.is_(None)) | (OutboxEvent.next_attempt_at <= now),
+            )
+            .order_by(OutboxEvent.occurred_at.asc())
+            .limit(batch_size)
+            .with_for_update(skip_locked=True)
+        ).all()
+        claimed_ids = [row.event_id for row in rows]
+        lease_deadline = now + timedelta(seconds=settings.n8n_delivery_lease_seconds)
+        for row in rows:
+            row.delivery_status = "delivering"
+            row.next_attempt_at = lease_deadline
+            # The token is stored inside the internal payload (the wire envelope below
+            # explicitly selects only contract fields). It lets the outcome transaction
+            # prove that this is still the same lease after network I/O. A stale worker
+            # must never overwrite a later reclaim/retry or an idempotent callback.
+            row.payload_json = {
+                **row.payload_json,
+                "_delivery_claim_token": str(uuid.uuid4()),
+            }
+        db.commit()
+        return claimed_ids
+    finally:
+        db.close()
+
+
+def _deliver_one(event_id: uuid.UUID) -> None:
+    db = SessionLocal()
+    try:
+        event = db.get(OutboxEvent, event_id)
+        if event is None:
+            return
+        # Reconstruct the wire envelope from contracts/events.schema.json: only the fields
+        # the schema declares (additionalProperties: false), sourced from real columns where
+        # possible. `payload_json` also carries an internal `aggregate_ref` convenience field
+        # for our own dashboard/audit reads, which must not be forwarded to n8n.
+        try:
+            wire_event = {
+                "event_id": str(event.event_id),
+                "event_type": event.event_type,
+                "occurred_at": event.occurred_at.isoformat(),
+                "correlation_id": event.payload_json["correlation_id"],
+                "aggregate": event.payload_json["aggregate"],
+                "data": event.payload_json["data"],
+            }
+            payload_error: str | None = None
+        except KeyError as exc:
+            # A malformed payload must still resolve the claimed "delivering" row to a
+            # terminal-or-retryable state below, rather than leaving it stuck forever.
+            wire_event = None
+            payload_error = f"Malformed outbox payload, missing key {exc}"
+        attempts = event.attempts
+        claim_token = event.payload_json.get("_delivery_claim_token")
+        if event.delivery_status != "delivering" or not isinstance(claim_token, str):
+            return
+    finally:
+        db.close()
+
+    error_code: str | None
+    if wire_event is None:
+        success, error, body = False, payload_error, None
+        error_code = "malformedPayload"
+    else:
+        try:
+            response = httpx.post(
+                settings.n8n_webhook_url,
+                json=wire_event,
+                headers={"X-Fleet-Ops-Trigger-Token": settings.n8n_webhook_trigger_token},
+                timeout=settings.n8n_http_timeout_seconds,
+            )
+            response.raise_for_status()
+            try:
+                body = response.json()
+            except ValueError:
+                body = None
+            if isinstance(body, dict):
+                acknowledged = body.get("ok") is True
+                response_event_id = body.get("event_id")
+                event_id_matches = response_event_id == str(event_id)
+                result = body.get("result")
+                execution_id = result.get("execution_id") if isinstance(result, dict) else None
+                execution_id_valid = isinstance(execution_id, str) and bool(execution_id.strip())
+                success = acknowledged and event_id_matches and execution_id_valid
+                if success:
+                    error = None
+                    error_code = None
+                elif not acknowledged:
+                    error = (
+                        "n8n response did not explicitly acknowledge the event with ok=true: "
+                        f"{body}"
+                    )
+                    error_code = (
+                        "remoteReportedFailure" if body.get("ok") is False else "malformedResponse"
+                    )
+                elif not event_id_matches:
+                    error = (
+                        "n8n acknowledged a different event ID "
+                        f"(expected {event_id}, received {response_event_id!r})"
+                    )
+                    error_code = "mismatchedEventId"
+                else:
+                    error = "n8n response omitted a valid result.execution_id"
+                    error_code = "malformedResponse"
+            else:
+                # A 2xx status with a non-object (or unparsable) body means the workflow
+                # itself errored before its "Respond to Webhook" node ran -- n8n's default
+                # error response still carries a 2xx-looking status here. Treat it as a
+                # failure so the event is retried rather than lost or wrongly marked
+                # succeeded.
+                success = False
+                error = (
+                    f"Unexpected non-JSON-object response from n8n (status {response.status_code})"
+                )
+                error_code = "malformedResponse"
+        except httpx.HTTPError as exc:
+            success = False
+            error = f"{type(exc).__name__}: {exc}"
+            error_code = "connectionError"
+            body = None
+
+    db = SessionLocal()
+    try:
+        event = db.scalar(
+            select(OutboxEvent).where(OutboxEvent.event_id == event_id).with_for_update()
+        )
+        if event is None:
+            return
+        if (
+            event.delivery_status != "delivering"
+            or event.attempts != attempts
+            or event.payload_json.get("_delivery_claim_token") != claim_token
+        ):
+            logger.info(
+                "Ignoring stale delivery outcome for event %s because lease ownership changed",
+                event_id,
+            )
+            return
+        event.attempts = attempts + 1
+        event.payload_json = {
+            key: value
+            for key, value in event.payload_json.items()
+            if key != "_delivery_claim_token"
+        }
+        if success:
+            event.delivery_status = "succeeded"
+            event.last_error = None
+            event.last_error_code = None
+            event.next_attempt_at = None
+            result = (body or {}).get("result")
+            execution_id = result.get("execution_id") if isinstance(result, dict) else None
+            event.external_run_id = execution_id if isinstance(execution_id, str) else None
+        else:
+            event.last_error = (error or "delivery failed")[:2000]
+            event.last_error_code = error_code or "unknownError"
+            if event.attempts >= settings.n8n_max_attempts:
+                event.delivery_status = "failed"
+                event.next_attempt_at = None
+            else:
+                event.delivery_status = "pending"
+                event.next_attempt_at = datetime.now(UTC) + timedelta(
+                    seconds=_backoff_seconds(event.attempts)
+                )
+        db.commit()
+    finally:
+        db.close()
+
+
+def run_dispatch_cycle() -> int:
+    """Run one reclaim+claim+deliver cycle. Returns the number of events processed."""
+    _reclaim_stale_deliveries()
+    claimed = _claim_due_events()
+    for event_id in claimed:
+        _deliver_one(event_id)
+    return len(claimed)
+
+
+def _loop() -> None:
+    while not _stop_event.is_set():
+        try:
+            run_dispatch_cycle()
+        except Exception:  # noqa: BLE001
+            logger.exception("Outbox dispatch cycle failed")
+        _stop_event.wait(settings.n8n_dispatch_interval_seconds)
+
+
+def start_background_dispatcher() -> None:
+    if not settings.n8n_dispatch_enabled:
+        return
+    _stop_event.clear()
+    thread = threading.Thread(target=_loop, name="outbox-dispatcher", daemon=True)
+    thread.start()
+
+
+def stop_background_dispatcher() -> None:
+    _stop_event.set()

backend/app/services/integration_status.py

@@ -0,0 +1,343 @@
+from __future__ import annotations
+
+import threading
+import time
+from collections.abc import Sequence
+from datetime import UTC, datetime, timedelta
+from typing import Any, Literal
+
+import httpx
+from sqlalchemy import Row, func, or_, select
+from sqlalchemy.orm import Session
+
+from app.core.config import get_settings
+from app.models.audit import AuditEvent
+from app.models.outbox import DEMO_SCENARIO_ERROR_CODE, OutboxEvent
+from app.schemas import (
+    McpHubIntegrationStatus,
+    N8nErrorHandlerStatus,
+    N8nIntegrationStatus,
+    N8nWorkflowEvidence,
+)
+
+settings = get_settings()
+_hub_health_lock = threading.Lock()
+_hub_health_cached_at = 0.0
+_hub_health_cached_value: bool | None = None
+
+# The 4 canonical Fleet Ops n8n workflows (see n8n/workflows/MANIFEST.md). All 4 are
+# built (all with their full node set saved).
+_CANONICAL_WORKFLOWS = (
+    "Fleet Ops — Vehicle Return Orchestration",
+    "Fleet Ops — Scheduled Data Quality Scan",
+    "Fleet Ops — RAGcore Procedure Sync",
+    "Fleet Ops — Workflow Error Handler",
+)
+_STALE_AFTER = {
+    "Fleet Ops — Scheduled Data Quality Scan": timedelta(hours=2, minutes=30),
+    "Fleet Ops — RAGcore Procedure Sync": timedelta(hours=30),
+}
+
+
+def _latest_rows_per_workflow(db: Session, action: str) -> Sequence[Row[Any]]:
+    """Return the most recent audit row per workflow name for one action.
+
+    Heartbeats arrive on every scheduled run, so loading *all* rows and picking the
+    latest in Python would grow linearly with deployment age. ``DISTINCT ON`` lets
+    PostgreSQL return exactly one (latest) row per workflow instead.
+    """
+    workflow_name = AuditEvent.after_json["workflow_name"].astext
+    return db.execute(
+        select(AuditEvent.occurred_at, AuditEvent.after_json, AuditEvent.metadata_json)
+        .where(AuditEvent.action == action)
+        .distinct(workflow_name)
+        .order_by(workflow_name, AuditEvent.occurred_at.desc())
+    ).all()
+
+
+def derive_n8n_status(db: Session) -> N8nIntegrationStatus:
+    counts: dict[str, int] = dict(
+        db.execute(
+            select(OutboxEvent.delivery_status, func.count()).group_by(OutboxEvent.delivery_status)
+        ).all()  # type: ignore[arg-type]
+    )
+    pending = counts.get("pending", 0)
+    delivering = counts.get("delivering", 0)
+    failed = counts.get("failed", 0)
+    succeeded = counts.get("succeeded", 0)
+
+    # Prepared demo failures are props, not health signals. They stay visible and
+    # counted -- hiding them would be its own kind of lie -- but they are counted
+    # *separately*, and only genuinely unexpected failures are allowed to move n8n off
+    # "operational". Without this split the demo seed's single staged failure pins the
+    # integration to "degraded" forever, which tells a viewer something untrue about
+    # the automation.
+    demo_scenario_failed = (
+        db.scalar(
+            select(func.count())
+            .select_from(OutboxEvent)
+            .where(
+                OutboxEvent.delivery_status == "failed",
+                OutboxEvent.last_error_code == DEMO_SCENARIO_ERROR_CODE,
+            )
+        )
+        or 0
+    )
+    unexpected_failed = max(failed - demo_scenario_failed, 0)
+
+    latest_success_at = db.scalar(
+        select(func.max(OutboxEvent.updated_at)).where(OutboxEvent.delivery_status == "succeeded")
+    )
+    # Health talks about real failures only, so the "latest failure" a health reader
+    # sees must exclude the staged one too.
+    latest_failure_at = db.scalar(
+        select(func.max(OutboxEvent.updated_at)).where(
+            OutboxEvent.delivery_status == "failed",
+            or_(
+                OutboxEvent.last_error_code.is_(None),
+                OutboxEvent.last_error_code != DEMO_SCENARIO_ERROR_CODE,
+            ),
+        )
+    )
+    latest_demo_scenario_at = db.scalar(
+        select(func.max(OutboxEvent.updated_at)).where(
+            OutboxEvent.delivery_status == "failed",
+            OutboxEvent.last_error_code == DEMO_SCENARIO_ERROR_CODE,
+        )
+    )
+
+    state: Literal["disabled", "unavailable", "degraded", "operational", "no_evidence"]
+    if not settings.n8n_dispatch_enabled:
+        state = "disabled"
+    elif not settings.n8n_webhook_url:
+        # Persisted history does not make a currently unconfigured dispatcher green.
+        state = "unavailable"
+    elif unexpected_failed > 0 and succeeded == 0:
+        state = "unavailable"
+    elif unexpected_failed > 0:
+        state = "degraded"
+    # Queued/in-flight work proves only that MobilityOps has work for the dispatcher;
+    # it does not prove that n8n has ever accepted a delivery.  A green state requires
+    # at least one persisted successful round trip.
+    elif succeeded > 0:
+        state = "operational"
+    else:
+        state = "no_evidence"
+
+    # Scheduled scan evidence: only service-triggered runs count as n8n evidence, not
+    # runs an operator triggered manually from the Data Quality page.
+    latest_scan_at = db.scalar(
+        select(func.max(AuditEvent.occurred_at)).where(
+            AuditEvent.action == "data_quality_scan_run",
+            AuditEvent.actor_type == "service",
+        )
+    )
+
+    # RAGcore Procedure Sync evidence: result reports posted by the workflow itself once
+    # it finishes uploading procedures to RAGcore (app/api/routers/integrations.py::
+    # procedures_sync_result), the same "the workflow's own callback is the evidence"
+    # pattern the scheduled scan and error handler already use below.
+    latest_procedure_sync_row = db.execute(
+        select(AuditEvent.occurred_at, AuditEvent.after_json, AuditEvent.metadata_json)
+        .where(AuditEvent.action == "n8n_procedures_synced")
+        .order_by(AuditEvent.occurred_at.desc())
+        .limit(1)
+    ).first()
+    latest_procedure_sync_at = (
+        latest_procedure_sync_row[0] if latest_procedure_sync_row is not None else None
+    )
+
+    # Error handler evidence: registrations posted by the "Fleet Ops — Workflow Error
+    # Handler" n8n workflow itself, which also doubles as proof that workflow is wired
+    # up and firing correctly.
+    total_failures_registered = (
+        db.scalar(
+            select(func.count(AuditEvent.id)).where(
+                AuditEvent.action == "n8n_workflow_failure_registered"
+            )
+        )
+        or 0
+    )
+    latest_failure_row = db.execute(
+        select(AuditEvent.occurred_at, AuditEvent.after_json)
+        .where(AuditEvent.action == "n8n_workflow_failure_registered")
+        .order_by(AuditEvent.occurred_at.desc())
+        .limit(1)
+    ).first()
+    latest_handler_failure_at = latest_failure_row[0] if latest_failure_row else None
+    latest_handler_failure_workflow = (
+        (latest_failure_row[1] or {}).get("workflow_name") if latest_failure_row else None
+    )
+
+    legacy_evidence_by_workflow = {
+        "Fleet Ops — Vehicle Return Orchestration": latest_success_at,
+        "Fleet Ops — Scheduled Data Quality Scan": latest_scan_at,
+        "Fleet Ops — RAGcore Procedure Sync": latest_procedure_sync_at,
+        "Fleet Ops — Workflow Error Handler": latest_handler_failure_at,
+    }
+    heartbeat_by_workflow: dict[str, tuple[datetime, str, str | None]] = {}
+    heartbeat_rows = _latest_rows_per_workflow(db, "n8n_workflow_heartbeat")
+    for occurred_at, after, metadata in heartbeat_rows:
+        workflow_name = (after or {}).get("workflow_name")
+        if workflow_name in _CANONICAL_WORKFLOWS and workflow_name not in heartbeat_by_workflow:
+            heartbeat_by_workflow[workflow_name] = (
+                occurred_at,
+                (after or {}).get("status", "succeeded"),
+                (metadata or {}).get("execution_id"),
+            )
+
+    failure_by_workflow: dict[str, tuple[datetime, str | None]] = {}
+    failure_rows = _latest_rows_per_workflow(db, "n8n_workflow_failure_registered")
+    for occurred_at, after, metadata in failure_rows:
+        workflow_name = (after or {}).get("workflow_name")
+        if workflow_name in _CANONICAL_WORKFLOWS and workflow_name not in failure_by_workflow:
+            failure_by_workflow[workflow_name] = (
+                occurred_at,
+                (metadata or {}).get("execution_id"),
+            )
+
+    now = datetime.now(UTC)
+    workflows: list[N8nWorkflowEvidence] = []
+    for name in _CANONICAL_WORKFLOWS:
+        legacy_seen = legacy_evidence_by_workflow[name]
+        heartbeat = heartbeat_by_workflow.get(name)
+        failure_signal = failure_by_workflow.get(name)
+        seen_at = heartbeat[0] if heartbeat else legacy_seen
+        last_status: Literal["succeeded", "failed"] | None = (
+            "succeeded" if seen_at is not None else None
+        )
+        execution_id = heartbeat[2] if heartbeat else None
+        if heartbeat and heartbeat[1] == "failed":
+            last_status = "failed"
+        if failure_signal and (seen_at is None or failure_signal[0] > seen_at):
+            seen_at = failure_signal[0]
+            last_status = "failed"
+            execution_id = failure_signal[1]
+        if name == "Fleet Ops — RAGcore Procedure Sync" and latest_procedure_sync_row:
+            sync_at, sync_result, sync_metadata = latest_procedure_sync_row
+            synced = (sync_result or {}).get("synced", 0)
+            failed_syncs = (sync_result or {}).get("failed", 0)
+            # The result callback is authoritative for corpus delivery. A generic
+            # succeeded heartbeat cannot turn a zero/partial upload green.
+            sync_result_failed = (
+                not isinstance(synced, int)
+                or not isinstance(failed_syncs, int)
+                or synced <= 0
+                or failed_syncs > 0
+            )
+            if sync_result_failed:
+                last_status = "failed"
+            if seen_at is None or sync_at > seen_at:
+                seen_at = sync_at
+            if sync_result_failed:
+                execution_id = (sync_metadata or {}).get("execution_id")
+        workflow_state: Literal["no_evidence", "healthy", "stale", "failed"]
+        if seen_at is None:
+            workflow_state = "no_evidence"
+        elif last_status == "failed":
+            workflow_state = "failed"
+        elif name in _STALE_AFTER and now - seen_at > _STALE_AFTER[name]:
+            workflow_state = "stale"
+        else:
+            workflow_state = "healthy"
+        workflows.append(
+            N8nWorkflowEvidence(
+                name=name,
+                built=True,
+                last_seen_at=seen_at,
+                state=workflow_state,
+                last_status=last_status,
+                last_execution_id=execution_id,
+            )
+        )
+
+    if state in {"operational", "no_evidence"} and any(
+        workflow.state in {"failed", "stale"} for workflow in workflows
+    ):
+        state = "degraded"
+
+    return N8nIntegrationStatus(
+        configured=bool(settings.n8n_webhook_url),
+        dispatch_enabled=settings.n8n_dispatch_enabled,
+        state=state,
+        pending=pending,
+        delivering=delivering,
+        failed=failed,
+        unexpected_failed=unexpected_failed,
+        demo_scenario_failed=demo_scenario_failed,
+        succeeded=succeeded,
+        latest_success_at=latest_success_at,
+        latest_failure_at=latest_failure_at,
+        latest_demo_scenario_at=latest_demo_scenario_at,
+        expected_workflow_count=len(_CANONICAL_WORKFLOWS),
+        known_workflow_count=sum(1 for w in workflows if w.last_seen_at is not None),
+        workflows=workflows,
+        error_handler=N8nErrorHandlerStatus(
+            total_failures_registered=total_failures_registered,
+            latest_failure_at=latest_handler_failure_at,
+            latest_failure_workflow=latest_handler_failure_workflow,
+        ),
+    )
+
+
+def derive_mcp_hub_status(db: Session) -> McpHubIntegrationStatus:
+    """Evidence-based MCP Hub status: real tool-call audit history, not just the
+    `MCP_HUB_REGISTRATION_ENABLED` flag flipped on. Every `mcp_tool_request` call
+    already writes an `AuditEvent` (see `app/api/routers/mcp_integrations.py`)."""
+    total_calls = (
+        db.scalar(select(func.count(AuditEvent.id)).where(AuditEvent.action == "mcp_tool_request"))
+        or 0
+    )
+    latest_call_row = db.execute(
+        select(AuditEvent.occurred_at, AuditEvent.actor_label, AuditEvent.metadata_json)
+        .where(AuditEvent.action == "mcp_tool_request")
+        .order_by(AuditEvent.occurred_at.desc())
+        .limit(1)
+    ).first()
+    last_called_at = latest_call_row[0] if latest_call_row else None
+    last_client = latest_call_row[1] if latest_call_row else None
+    last_tool = (latest_call_row[2] or {}).get("tool") if latest_call_row else None
+
+    hub_reachable = _check_hub_reachable()
+
+    state: Literal["not_configured", "no_evidence", "operational"]
+    if not settings.mcp_hub_registration_enabled:
+        state = "not_configured"
+    elif total_calls > 0 and hub_reachable is not False:
+        state = "operational"
+    else:
+        # Historical tool calls remain useful telemetry, but cannot support a current
+        # operational claim when the configured Hub health endpoint is unreachable.
+        # ``hub_reachable`` stays available separately so consumers can distinguish
+        # this from a provider that simply has no call evidence yet.
+        state = "no_evidence"
+
+    return McpHubIntegrationStatus(
+        registration_enabled=settings.mcp_hub_registration_enabled,
+        state=state,
+        total_calls=total_calls,
+        last_tool=last_tool,
+        last_client=last_client,
+        last_called_at=last_called_at,
+        hub_reachable=hub_reachable,
+    )
+
+
+def _check_hub_reachable() -> bool | None:
+    """Real Hub-side health signal (MCP Hub's own registration is catalog-driven on
+    its side, so this is the only thing Fleet Ops itself can honestly check).
+    `None` means not configured / not checked, never a guess."""
+    if not settings.mcp_hub_base_url:
+        return None
+    global _hub_health_cached_at, _hub_health_cached_value
+    now = time.monotonic()
+    with _hub_health_lock:
+        if now - _hub_health_cached_at < settings.mcp_hub_health_cache_seconds:
+            return _hub_health_cached_value
+        try:
+            response = httpx.get(f"{settings.mcp_hub_base_url.rstrip('/')}/health", timeout=1.5)
+            _hub_health_cached_value = response.status_code == 200
+        except httpx.HTTPError:
+            _hub_health_cached_value = False
+        _hub_health_cached_at = time.monotonic()
+        return _hub_health_cached_value

backend/app/services/knowledge/__init__.py

@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+from datetime import datetime
+from functools import lru_cache
+from typing import Literal, Protocol
+
+from pydantic import BaseModel
+
+from app.core.config import get_settings
+
+EvidenceState = Literal["grounded", "insufficient", "unavailable"]
+KnowledgeStatisticsState = Literal["verified", "sync_reported", "not_reported"]
+
+
+class SourceCard(BaseModel):
+    document_id: str
+    title: str
+    version: str
+    section: str
+    excerpt: str
+
+
+class GroundedAnswer(BaseModel):
+    answer: str
+    evidence_state: EvidenceState
+    sources: list[SourceCard]
+    provider: str
+    correlation_id: str
+
+
+class KnowledgeHealth(BaseModel):
+    provider: str
+    available: bool
+    detail: str
+    tenant: str
+    workspace: str
+    collection: str
+    # A provider may be healthy without exposing a corpus-size endpoint. `None` means
+    # unknown, never "zero procedures".
+    document_count: int | None
+    source_document_count: int
+    reported_synced_document_count: int | None
+    reported_failed_document_count: int | None
+    last_sync_at: datetime | None
+    statistics_state: KnowledgeStatisticsState
+
+
+class KnowledgeProvider(Protocol):
+    name: str
+
+    def health(self, language: str = "en-GB") -> KnowledgeHealth: ...
+
+    def ask(
+        self, question: str, correlation_id: str, language: str = "en-GB"
+    ) -> GroundedAnswer: ...
+
+
+@lru_cache
+def get_knowledge_provider() -> KnowledgeProvider:
+    settings = get_settings()
+    if settings.knowledge_provider == "ragcore":
+        from app.services.knowledge.ragcore import RAGcoreKnowledgeProvider
+
+        return RAGcoreKnowledgeProvider()
+    from app.services.knowledge.demo import DemoKnowledgeProvider
+
+    return DemoKnowledgeProvider()

backend/app/services/knowledge/demo.py

@@ -0,0 +1,413 @@
+from __future__ import annotations
+
+import math
+import re
+from dataclasses import dataclass, field
+from pathlib import Path
+
+from app.core.config import get_settings
+from app.services.knowledge import GroundedAnswer, KnowledgeHealth, SourceCard
+from app.services.knowledge.procedures import parse_frontmatter
+
+SUPPORTED_LANGUAGES = ("nl-BE", "en-GB", "fr-BE")
+DEFAULT_LANGUAGE = "en-GB"
+
+STOPWORDS_BY_LANGUAGE: dict[str, set[str]] = {
+    "en-GB": {
+        "a",
+        "an",
+        "the",
+        "is",
+        "are",
+        "was",
+        "were",
+        "be",
+        "been",
+        "being",
+        "to",
+        "of",
+        "in",
+        "on",
+        "at",
+        "for",
+        "and",
+        "or",
+        "but",
+        "if",
+        "then",
+        "do",
+        "does",
+        "did",
+        "must",
+        "may",
+        "can",
+        "could",
+        "should",
+        "would",
+        "i",
+        "you",
+        "it",
+        "we",
+        "they",
+        "my",
+        "your",
+        "what",
+        "when",
+        "how",
+        "with",
+        "without",
+        "this",
+        "that",
+        "these",
+        "those",
+        "not",
+        "no",
+    },
+    "nl-BE": {
+        "een",
+        "de",
+        "het",
+        "is",
+        "zijn",
+        "was",
+        "waren",
+        "worden",
+        "wordt",
+        "van",
+        "in",
+        "op",
+        "voor",
+        "en",
+        "of",
+        "maar",
+        "als",
+        "dan",
+        "moet",
+        "mag",
+        "kan",
+        "kunnen",
+        "zou",
+        "zouden",
+        "ik",
+        "jij",
+        "u",
+        "we",
+        "wij",
+        "zij",
+        "mijn",
+        "jouw",
+        "wat",
+        "wanneer",
+        "hoe",
+        "met",
+        "zonder",
+        "dit",
+        "dat",
+        "deze",
+        "die",
+        "niet",
+        "geen",
+    },
+    "fr-BE": {
+        "un",
+        "une",
+        "le",
+        "la",
+        "les",
+        "des",
+        "est",
+        "sont",
+        "était",
+        "être",
+        "de",
+        "du",
+        "en",
+        "sur",
+        "pour",
+        "et",
+        "ou",
+        "mais",
+        "si",
+        "alors",
+        "doit",
+        "peut",
+        "peuvent",
+        "pourrait",
+        "devrait",
+        "je",
+        "tu",
+        "vous",
+        "il",
+        "elle",
+        "nous",
+        "ils",
+        "mon",
+        "votre",
+        "quoi",
+        "quand",
+        "comment",
+        "avec",
+        "sans",
+        "ce",
+        "cette",
+        "ces",
+        "cela",
+        "pas",
+        "non",
+    },
+}
+
+# Includes the Latin-1 accented-letter range (à-ö, ø-ÿ) so French/Dutch words with
+# diacritics (véhicule, réservation, geëscaleerd) tokenize as one word instead of
+# splitting apart at the accented character -- a plain [a-z0-9]+ pattern silently
+# drops every accent and fragments the word either side of it.
+_WORD_RE = re.compile(r"[a-zà-öø-ÿ0-9]+")
+
+
+def _stem(word: str) -> str:
+    # Deterministic, intentionally crude suffix stripping — good enough to match "returns"
+    # with "return" or "damaged" with "damage" without pulling in a stemming dependency.
+    for suffix in ("ing", "edly", "ed", "es", "s"):
+        if len(word) > len(suffix) + 2 and word.endswith(suffix):
+            return word[: -len(suffix)]
+    return word
+
+
+def _tokenize(text: str, language: str) -> set[str]:
+    stopwords = STOPWORDS_BY_LANGUAGE.get(language, STOPWORDS_BY_LANGUAGE[DEFAULT_LANGUAGE])
+    words = _WORD_RE.findall(text.lower())
+    return {_stem(w) for w in words if w not in stopwords and len(w) > 2}
+
+
+@dataclass
+class Document:
+    document_id: str
+    title: str
+    version: str
+    title_tokens: set[str] = field(default_factory=set)
+
+
+@dataclass
+class ScoredSection:
+    document: Document
+    heading: str
+    text: str
+    heading_tokens: set[str]
+    body_tokens: set[str]
+
+
+def _split_sections(body: str) -> list[tuple[str, str]]:
+    sections: list[tuple[str, str]] = []
+    current_heading = "Overview"
+    current_lines: list[str] = []
+    for line in body.splitlines():
+        if line.startswith("## "):
+            if current_lines:
+                sections.append((current_heading, "\n".join(current_lines).strip()))
+            current_heading = line[3:].strip()
+            current_lines = []
+        elif line.startswith("# "):
+            continue
+        else:
+            current_lines.append(line)
+    if current_lines:
+        sections.append((current_heading, "\n".join(current_lines).strip()))
+    return sections
+
+
+def _load_sections(procedures_dir: Path, language: str) -> list[ScoredSection]:
+    sections: list[ScoredSection] = []
+    for path in sorted(procedures_dir.glob("*.md")):
+        raw = path.read_text(encoding="utf-8")
+        meta, body = parse_frontmatter(raw)
+        title = meta.get("title", path.stem)
+        doc = Document(
+            document_id=meta.get("document_id", path.stem),
+            title=title,
+            version=meta.get("version", "1.0"),
+            title_tokens=_tokenize(title, language),
+        )
+        for heading, text in _split_sections(body):
+            sections.append(
+                ScoredSection(
+                    document=doc,
+                    heading=heading,
+                    text=text,
+                    heading_tokens=_tokenize(heading, language),
+                    body_tokens=_tokenize(text, language),
+                )
+            )
+    return sections
+
+
+_NO_MATCH_TEXT = {
+    "en-GB": "No matching procedure was found for this question.",
+    "nl-BE": "Er werd geen passende procedure gevonden voor deze vraag.",
+    "fr-BE": "Aucune procédure correspondante n'a été trouvée pour cette question.",
+}
+_LOW_CONFIDENCE_TEXT = {
+    "en-GB": (
+        "The available procedures do not clearly answer this question. "
+        "The closest matches are included below for review."
+    ),
+    "nl-BE": (
+        "De beschikbare procedures beantwoorden deze vraag niet duidelijk. "
+        "De dichtstbijzijnde overeenkomsten staan hieronder ter beoordeling."
+    ),
+    "fr-BE": (
+        "Les procédures disponibles ne répondent pas clairement à cette question. "
+        "Les correspondances les plus proches sont indiquées ci-dessous pour examen."
+    ),
+}
+_LEAD_ANSWER_TEMPLATE = {
+    "en-GB": 'Per "{title}" (v{version}), section "{heading}": {excerpt}',
+    "nl-BE": 'Volgens "{title}" (v{version}), sectie "{heading}": {excerpt}',
+    "fr-BE": "Selon « {title} » (v{version}), section « {heading} » : {excerpt}",
+}
+
+
+class DemoKnowledgeProvider:
+    """Deterministic extractive retrieval over the local procedure Markdown files.
+
+    Not a generative model: it scores sections with TF-IDF-weighted keyword overlap
+    (downweighting terms common across the whole corpus, like "vehicle", in favor of
+    distinctive ones, like "damage") and returns real excerpts, never invented text.
+
+    Each supported UI language has its own translated procedure corpus under
+    knowledge/procedures/<language>/ -- retrieval searches only within the requested
+    language's corpus so citations always link to a same-language document.
+    """
+
+    name = "demo"
+
+    def __init__(self) -> None:
+        settings = get_settings()
+        self._settings = settings
+        base_dir = Path(settings.knowledge_dir)
+        self._sections_by_language: dict[str, list[ScoredSection]] = {}
+        self._idf_by_language: dict[str, dict[str, float]] = {}
+        self._document_count_by_language: dict[str, int] = {}
+        for language in SUPPORTED_LANGUAGES:
+            lang_dir = base_dir / language
+            sections = _load_sections(lang_dir, language) if lang_dir.is_dir() else []
+            self._sections_by_language[language] = sections
+            self._idf_by_language[language] = self._build_idf(sections)
+            self._document_count_by_language[language] = len(
+                {s.document.document_id for s in sections}
+            )
+
+    @staticmethod
+    def _build_idf(sections: list[ScoredSection]) -> dict[str, float]:
+        n = len(sections) or 1
+        doc_freq: dict[str, int] = {}
+        for section in sections:
+            doc = section.document
+            all_tokens = doc.title_tokens | section.heading_tokens | section.body_tokens
+            for token in all_tokens:
+                doc_freq[token] = doc_freq.get(token, 0) + 1
+        return {token: math.log((n + 1) / (df + 1)) + 1 for token, df in doc_freq.items()}
+
+    def _normalize_language(self, language: str | None) -> str:
+        if language in SUPPORTED_LANGUAGES:
+            return language
+        return DEFAULT_LANGUAGE
+
+    def health(self, language: str = DEFAULT_LANGUAGE) -> KnowledgeHealth:
+        language = self._normalize_language(language)
+        return KnowledgeHealth(
+            provider=self.name,
+            available=True,
+            detail="Deterministic keyword-matching demo provider; no external service.",
+            tenant=self._settings.ragcore_tenant,
+            workspace=self._settings.ragcore_workspace,
+            collection=self._settings.ragcore_collection,
+            document_count=self._document_count_by_language[language],
+            source_document_count=self._document_count_by_language[language],
+            reported_synced_document_count=None,
+            reported_failed_document_count=None,
+            last_sync_at=None,
+            statistics_state="verified",
+        )
+
+    def _score(
+        self, query_tokens: set[str], section: ScoredSection, idf: dict[str, float]
+    ) -> float:
+        # The section body is the strongest relevance signal -- it's the actual
+        # substance a heading or title can only hint at -- so a body match is weighted
+        # *above* heading/title matches, not below them. The previous 3x/2x/1x
+        # (heading/title/body) ordering let a single generic word in a heading (e.g.
+        # "vehicle", present in nearly every section) or a document's own title
+        # outrank a section whose body genuinely covers multiple, more distinctive
+        # query terms -- confirmed to misrank the brief's exact validation question in
+        # every one of the three languages (see docs/fleet-ops-correction/
+        # current-gap-audit.md and i18n-inventory.md): nl-BE picked a checkout section
+        # over the damage procedure, en-GB and fr-BE picked the return procedure over
+        # the damage procedure, purely from heading/title overlap on common words.
+        score = 0.0
+        for token in query_tokens:
+            token_idf = idf.get(token, 0.0)
+            if token_idf == 0.0:
+                continue
+            if token in section.body_tokens:
+                score += 3 * token_idf
+            elif token in section.heading_tokens:
+                score += 2 * token_idf
+            elif token in section.document.title_tokens:
+                score += 1.5 * token_idf
+        return score
+
+    def ask(
+        self, question: str, correlation_id: str, language: str = DEFAULT_LANGUAGE
+    ) -> GroundedAnswer:
+        language = self._normalize_language(language)
+        sections = self._sections_by_language[language]
+        idf = self._idf_by_language[language]
+        query_tokens = _tokenize(question, language)
+        scored = [(self._score(query_tokens, section, idf), section) for section in sections]
+        scored = [(score, section) for score, section in scored if score > 0]
+        scored.sort(key=lambda item: item[0], reverse=True)
+        top = scored[:3]
+
+        if not top:
+            return GroundedAnswer(
+                answer=_NO_MATCH_TEXT[language],
+                evidence_state="insufficient",
+                sources=[],
+                provider=self.name,
+                correlation_id=correlation_id,
+            )
+
+        sources = [
+            SourceCard(
+                document_id=section.document.document_id,
+                title=section.document.title,
+                version=section.document.version,
+                section=section.heading,
+                excerpt=(section.text[:400] + "…") if len(section.text) > 400 else section.text,
+            )
+            for _, section in top
+        ]
+
+        if top[0][0] < 3:
+            return GroundedAnswer(
+                answer=_LOW_CONFIDENCE_TEXT[language],
+                evidence_state="insufficient",
+                sources=sources,
+                provider=self.name,
+                correlation_id=correlation_id,
+            )
+
+        lead_section = top[0][1]
+        answer = _LEAD_ANSWER_TEMPLATE[language].format(
+            title=lead_section.document.title,
+            version=lead_section.document.version,
+            heading=lead_section.heading,
+            excerpt=lead_section.text.splitlines()[0][:300],
+        )
+        return GroundedAnswer(
+            answer=answer,
+            evidence_state="grounded",
+            sources=sources,
+            provider=self.name,
+            correlation_id=correlation_id,
+        )

backend/app/services/knowledge/procedures.py

@@ -0,0 +1,73 @@
+from __future__ import annotations
+
+import hashlib
+import uuid
+from dataclasses import dataclass
+from pathlib import Path
+
+SUPPORTED_LANGUAGES = ("nl-BE", "en-GB", "fr-BE")
+
+# Stable across runs (and across which language ships first) so a document's RAGcore
+# source_id never changes just because the sync ran on a different day or in a
+# different order -- required for RAGcore's upload idempotency to work per document.
+_SOURCE_ID_NAMESPACE = uuid.uuid5(
+    uuid.NAMESPACE_URL, "https://mobilityops.internal/knowledge/procedures"
+)
+
+
+def parse_frontmatter(raw: str) -> tuple[dict[str, str], str]:
+    if not raw.startswith("---"):
+        return {}, raw
+    end = raw.find("\n---", 3)
+    if end == -1:
+        return {}, raw
+    block = raw[3:end].strip()
+    body = raw[end + 4 :].lstrip("\n")
+    meta: dict[str, str] = {}
+    for line in block.splitlines():
+        if ":" not in line:
+            continue
+        key, _, value = line.partition(":")
+        meta[key.strip()] = value.strip().strip('"')
+    return meta, body
+
+
+@dataclass(frozen=True)
+class ProcedureDocument:
+    source_id: str
+    language: str
+    document_id: str
+    title: str
+    version: str
+    content: str
+    content_hash: str
+
+
+def iter_procedure_documents(knowledge_dir: Path) -> list[ProcedureDocument]:
+    """Read every procedure Markdown file Fleet Ops ships, across every supported
+    language, as a flat list ready for external sync (e.g. into RAGcore). Frontmatter
+    fields (title, version) come from the same files the demo knowledge provider
+    already reads -- see parse_frontmatter -- so the two never drift apart."""
+
+    documents: list[ProcedureDocument] = []
+    for language in SUPPORTED_LANGUAGES:
+        language_dir = knowledge_dir / language
+        if not language_dir.is_dir():
+            continue
+        for path in sorted(language_dir.glob("*.md")):
+            raw = path.read_text(encoding="utf-8")
+            meta, body = parse_frontmatter(raw)
+            document_id = meta.get("document_id", path.stem)
+            content = body.strip()
+            documents.append(
+                ProcedureDocument(
+                    source_id=str(uuid.uuid5(_SOURCE_ID_NAMESPACE, f"{language}:{document_id}")),
+                    language=language,
+                    document_id=document_id,
+                    title=meta.get("title", path.stem),
+                    version=meta.get("version", "1.0"),
+                    content=content,
+                    content_hash=hashlib.sha256(content.encode("utf-8")).hexdigest(),
+                )
+            )
+    return documents

backend/app/services/knowledge/ragcore.py

@@ -0,0 +1,577 @@
+from __future__ import annotations
+
+import hashlib
+import re
+import uuid
+from concurrent.futures import ThreadPoolExecutor
+from pathlib import Path
+from threading import Lock
+from time import monotonic
+
+import httpx
+
+from app.core.config import get_settings
+from app.core.observability import KNOWLEDGE_PROVIDER_REQUESTS, KNOWLEDGE_RETRIEVAL_SCORE
+from app.services.knowledge import EvidenceState, GroundedAnswer, KnowledgeHealth, SourceCard
+from app.services.knowledge.procedures import ProcedureDocument, iter_procedure_documents
+
+_GROUNDED_ANSWERABILITY = {"answerable", "partially_answerable"}
+_ANSWERABILITY_STATES = _GROUNDED_ANSWERABILITY | {
+    "not_answerable",
+    "conflicting_evidence",
+}
+
+# Mirrors DemoKnowledgeProvider's own extractive template in spirit: a real cited
+# excerpt wrapped in a fixed sentence, never a generated summary. Used only as a
+# fallback when RAGcore's own /v1/answers (generation + citation validation) is
+# unavailable but its retrieval (/v1/search) still returns real, relevant, cited
+# results -- see ask() below. Unlike the demo corpus's own markdown frontmatter, RAGcore's
+# `document_version_id` is an opaque UUID, not a human-meaningful version string, so it
+# is deliberately left out of this sentence (it still appears on the source card itself).
+_LEAD_ANSWER_TEMPLATE = {
+    "en-GB": 'Per "{title}": {excerpt}',
+    "nl-BE": 'Volgens "{title}": {excerpt}',
+    "fr-BE": "Selon « {title} » : {excerpt}",
+}
+_DEFAULT_LANGUAGE = "en-GB"
+_MAX_SOURCE_CARDS = 3
+_INDEX_LOOKUP_TIMEOUT_SECONDS = 2.0
+_INDEX_VERIFICATION_TTL_SECONDS = 300.0
+_INDEX_VERIFICATION_WORKERS = 6
+
+_DOMAIN_CONCEPTS: dict[str, tuple[str, ...]] = {
+    "damage": ("damage", "damaged", "schade", "beschadigd", "dommage", "endommagé"),
+    "vehicle": ("vehicle", "car", "voertuig", "wagen", "véhicule", "voiture"),
+    "return": ("return", "returned", "retour", "terugbrengen", "restitution"),
+    "fuel": ("fuel", "brandstof", "carburant"),
+    "booking": ("booking", "reservation", "boeking", "réservation"),
+    "odometer": ("odometer", "mileage", "kilometer", "kilométrage", "compteur"),
+    "customer": ("customer", "client", "klant"),
+    "cleaning": ("cleaning", "reiniging", "poetsen", "nettoyage"),
+    "maintenance": ("maintenance", "service", "onderhoud", "entretien"),
+    "conflict": ("conflict", "overlap", "overlapping", "conflit", "chevauchement"),
+    "checkout": ("checkout", "departure", "vertrek", "départ"),
+    "availability": ("available", "availability", "beschikbaar", "disponible", "disponibilité"),
+    "technical": ("technical", "warning", "technisch", "waarschuwing", "technique", "alerte"),
+}
+_ANSWERABLE_INTENT_CONCEPTS = frozenset(_DOMAIN_CONCEPTS) - {"vehicle", "customer"}
+
+
+def _normalize_evidence_text(value: str) -> str:
+    return " ".join(re.findall(r"\w+", value.casefold()))
+
+
+def _question_concepts(question: str) -> set[str]:
+    normalized = question.casefold()
+    return {
+        concept
+        for concept, terms in _DOMAIN_CONCEPTS.items()
+        if any(term in normalized for term in terms)
+    }
+
+
+def _deduplicate_sources(sources: list[SourceCard]) -> list[SourceCard]:
+    """Collapse duplicate chunks and re-uploaded document versions.
+
+    RAGcore document/version UUIDs change across uploads, so they are not useful
+    deduplication keys. Human-visible citation identity is the normalized title,
+    section. Chunks from the same unsectioned document collapse into one card; distinct
+    named sections remain independently citable.
+    """
+    seen: set[tuple[str, str]] = set()
+    unique: list[SourceCard] = []
+    for source in sources:
+        key = (
+            source.title.strip().casefold(),
+            source.section.strip().casefold(),
+        )
+        if key in seen:
+            continue
+        seen.add(key)
+        unique.append(source)
+        if len(unique) == _MAX_SOURCE_CARDS:
+            break
+    return unique
+
+
+def _rank_sources_for_concepts(sources: list[SourceCard], concepts: set[str]) -> list[SourceCard]:
+    if "damage" not in concepts:
+        return sources
+    return sorted(
+        sources,
+        key=lambda source: (
+            0 if "damage" in f"{source.document_id} {source.title}".casefold() else 1
+        ),
+    )
+
+
+def _retrieval_score(result: object) -> float | None:
+    if not isinstance(result, dict):
+        return None
+    scores = result.get("scores")
+    if not isinstance(scores, dict):
+        return None
+    for name in ("rerank", "fused"):
+        value = scores.get(name)
+        if isinstance(value, int | float) and not isinstance(value, bool):
+            return float(value)
+    return None
+
+
+class RAGcoreKnowledgeProvider:
+    """Adapter for the central RAGcore service, against its real `/v1/*` contract
+    (see `docs/contracts/openapi.yaml` in the RAGcore checkout -- RAGcore is built and
+    owned separately, MobilityOps only ever talks to its documented HTTP API).
+
+    Authenticates as a service account via `Authorization: Bearer <token>` (RAGcore's
+    session-cookie auth is for its own browser admin UI only). Any connection error,
+    timeout, non-2xx response, or malformed body degrades to `evidence_state:
+    "unavailable"` rather than raising -- this is the adapter that actually exercises the
+    architecture's reliability boundary: RAGcore failure disables knowledge answers only,
+    never fabricates an answer, never affects the rest of the app.
+
+    `/v1/answers` (RAGcore's own generation + citation-validation step) is tried first;
+    if it is itself unavailable (non-2xx or unreachable -- as opposed to a real 200
+    classifying the question as insufficiently answerable), `ask()` falls back to
+    RAGcore's `/v1/search` retrieval, which is a materially different, simpler pipeline
+    stage with no generation step to fail. The fallback answer is always an extractive
+    excerpt RAGcore's own search actually found, wrapped in the same fixed citation
+    template `DemoKnowledgeProvider` uses -- never a fabricated summary.
+
+    Retrieval is scoped to the stable RAGcore ``source_id`` values owned by Fleet Ops for
+    the requested UI language. Returned internal document/version UUIDs are deliberately
+    not treated as Fleet Ops identifiers: every citation must instead prove the complete
+    managed-source chain (source id, URI, locator, checksum and extractive local text).
+    """
+
+    name = "ragcore"
+
+    def __init__(self) -> None:
+        self._settings = get_settings()
+        self._managed_documents_by_source_id: dict[str, ProcedureDocument] = {}
+        for document in iter_procedure_documents(Path(self._settings.knowledge_dir)):
+            self._managed_documents_by_source_id[document.source_id] = document
+        self._verification_cache: dict[str, tuple[float, int]] = {}
+        self._verification_lock = Lock()
+        self._answers_circuit_lock = Lock()
+        self._answers_circuit_open_until = 0.0
+
+    def _managed_source(self, citation: object, language: str) -> SourceCard | None:
+        if not isinstance(citation, dict):
+            return None
+        source_id = citation.get("source_id")
+        if not isinstance(source_id, str):
+            return None
+        document = self._managed_documents_by_source_id.get(str(source_id))
+        if document is None or document.language != language:
+            return None
+        if citation.get("locator") != f"{document.document_id}.md":
+            return None
+        if citation.get("source_uri") != f"ragcore://source/{document.source_id}":
+            return None
+        for field_name in ("id", "document_id", "document_version_id"):
+            value = citation.get(field_name)
+            if not isinstance(value, str):
+                return None
+            try:
+                parsed = uuid.UUID(value)
+            except (ValueError, TypeError, AttributeError):
+                return None
+            if parsed.int == 0:
+                return None
+        if not isinstance(citation.get("title"), str):
+            return None
+        section = citation.get("section")
+        if section is not None and not isinstance(section, str):
+            return None
+        excerpt = citation.get("excerpt")
+        if not isinstance(excerpt, str) or not excerpt.strip():
+            return None
+        expected_hash = hashlib.sha256(excerpt.encode("utf-8")).hexdigest()
+        if citation.get("excerpt_sha256") != expected_hash:
+            return None
+        # RAGcore owns chunking, but the cited excerpt must still be extractive evidence
+        # from the authoritative local procedure. Token normalization tolerates Markdown
+        # punctuation/whitespace while rejecting provider text that was never uploaded.
+        normalized_excerpt = _normalize_evidence_text(excerpt)
+        if not normalized_excerpt or normalized_excerpt not in _normalize_evidence_text(
+            document.content
+        ):
+            return None
+        return SourceCard(
+            document_id=document.document_id,
+            title=document.title,
+            version=document.version,
+            section=section or "",
+            excerpt=excerpt,
+        )
+
+    def _managed_source_ids(self, language: str) -> list[str]:
+        return [
+            document.source_id
+            for document in self._managed_documents_by_source_id.values()
+            if document.language == language
+        ]
+
+    def _answers_circuit_is_open(self) -> bool:
+        with self._answers_circuit_lock:
+            return monotonic() < self._answers_circuit_open_until
+
+    def _open_answers_circuit(self) -> None:
+        with self._answers_circuit_lock:
+            self._answers_circuit_open_until = monotonic() + max(
+                0.0, self._settings.ragcore_answers_circuit_breaker_seconds
+            )
+
+    def _close_answers_circuit(self) -> None:
+        with self._answers_circuit_lock:
+            self._answers_circuit_open_until = 0.0
+
+    def _client(self) -> httpx.Client:
+        headers = {}
+        if self._settings.ragcore_api_token:
+            headers["Authorization"] = f"Bearer {self._settings.ragcore_api_token}"
+        return httpx.Client(
+            base_url=self._settings.ragcore_base_url,
+            headers=headers,
+            timeout=self._settings.ragcore_http_timeout_seconds,
+        )
+
+    def health(self, language: str = "en-GB") -> KnowledgeHealth:
+        documents = [
+            document
+            for document in iter_procedure_documents(Path(self._settings.knowledge_dir))
+            if document.language == language
+        ]
+        verified_document_count: int | None = None
+        try:
+            with self._client() as client:
+                response = client.get("/health/ready")
+                body = response.json()
+                if not isinstance(body, dict):
+                    raise ValueError("health response is not a JSON object")
+                available = response.status_code == 200 and body.get("status") == "ok"
+                detail = (
+                    "RAGcore reachable and ready."
+                    if available
+                    else f"RAGcore degraded: {body.get('status', 'unknown')}"
+                )
+                if available:
+                    verified_document_count = self._verify_indexed_documents(
+                        client, language, documents
+                    )
+                    if verified_document_count is None:
+                        detail += " Index verification is temporarily unavailable."
+                    else:
+                        detail += (
+                            f" {verified_document_count}/{len(documents)} managed sources have "
+                            "an exact active published document in the configured space."
+                        )
+        except (httpx.HTTPError, ValueError) as exc:
+            available = False
+            detail = f"RAGcore unavailable: {type(exc).__name__}: {exc}"
+        return KnowledgeHealth(
+            provider=self.name,
+            available=available,
+            detail=detail,
+            tenant=self._settings.ragcore_tenant,
+            workspace=self._settings.ragcore_workspace,
+            collection=self._settings.ragcore_collection,
+            # RAGcore deliberately has no browse/count endpoint. Fleet Ops instead
+            # verifies each managed source through its exact identity lookup and only
+            # counts an active document with a published active version. RAGcore's
+            # content_sha256 describes its canonical parsed artifact, not the uploaded
+            # source bytes, so comparing it with Fleet Ops's source hash would be false.
+            document_count=verified_document_count,
+            source_document_count=len(documents),
+            reported_synced_document_count=None,
+            reported_failed_document_count=None,
+            last_sync_at=None,
+            statistics_state=(
+                "verified" if verified_document_count is not None else "not_reported"
+            ),
+        )
+
+    def _verify_indexed_documents(
+        self, client: httpx.Client, language: str, documents: list[ProcedureDocument]
+    ) -> int | None:
+        if not self._settings.ragcore_space_id or not documents:
+            return None
+
+        now = monotonic()
+        with self._verification_lock:
+            cached = self._verification_cache.get(language)
+            if cached is not None and now - cached[0] < _INDEX_VERIFICATION_TTL_SECONDS:
+                return cached[1]
+
+        def is_verified(document: ProcedureDocument) -> bool:
+            response = client.get(
+                "/v1/documents",
+                params={
+                    "source_id": document.source_id,
+                    "external_id": f"{document.document_id}.md",
+                },
+                timeout=_INDEX_LOOKUP_TIMEOUT_SECONDS,
+            )
+            if response.status_code != 200:
+                raise RuntimeError("RAGcore document verification failed")
+            body = response.json()
+            items = body.get("items") if isinstance(body, dict) else None
+            if not isinstance(items, list) or len(items) != 1 or not isinstance(items[0], dict):
+                return False
+            item = items[0]
+            active_version = item.get("active_version")
+            return bool(
+                item.get("space_id") == self._settings.ragcore_space_id
+                and item.get("source_id") == document.source_id
+                and item.get("external_id") == f"{document.document_id}.md"
+                and item.get("status") == "active"
+                and isinstance(active_version, dict)
+                and active_version.get("status") == "published"
+            )
+
+        try:
+            with ThreadPoolExecutor(
+                max_workers=min(_INDEX_VERIFICATION_WORKERS, len(documents))
+            ) as executor:
+                verified_count = sum(executor.map(is_verified, documents))
+        except (httpx.HTTPError, RuntimeError, TypeError, ValueError):
+            return None
+
+        with self._verification_lock:
+            self._verification_cache[language] = (monotonic(), verified_count)
+        return verified_count
+
+    def ask(self, question: str, correlation_id: str, language: str = "en-GB") -> GroundedAnswer:
+        unavailable = GroundedAnswer(
+            answer="",
+            evidence_state="unavailable",
+            sources=[],
+            provider=self.name,
+            correlation_id=correlation_id,
+        )
+        if not self._settings.ragcore_space_id:
+            return unavailable
+
+        if self._answers_circuit_is_open():
+            KNOWLEDGE_PROVIDER_REQUESTS.labels("answers", "circuit_open").inc()
+        else:
+            answered = self._ask_via_answers(question, correlation_id, language)
+            if answered is not None:
+                return answered
+        # /v1/answers itself is unavailable (non-2xx or unreachable) -- fall back to
+        # real retrieval rather than degrading straight to "unavailable". This never
+        # fabricates an answer to the question: it only ever shows an actually-cited
+        # excerpt RAGcore's own search already found, using the same extractive
+        # citation-wrapper template DemoKnowledgeProvider uses, never RAGcore's
+        # generation step.
+        return self._ask_via_search_fallback(question, correlation_id, language)
+
+    def _ask_via_answers(
+        self, question: str, correlation_id: str, language: str
+    ) -> GroundedAnswer | None:
+        """Returns None (not a GroundedAnswer) when /v1/answers itself is unavailable,
+        so the caller can fall back to search -- as opposed to a real 200 response
+        classifying the question as insufficiently answerable, which is a genuine,
+        final result, not a reason to fall back."""
+        try:
+            with self._client() as client:
+                response = client.post(
+                    "/v1/answers",
+                    json={
+                        "query": question,
+                        "requested_space_ids": [self._settings.ragcore_space_id],
+                        "filters": {"source_ids": self._managed_source_ids(language)},
+                    },
+                )
+                if response.status_code != 200:
+                    KNOWLEDGE_PROVIDER_REQUESTS.labels("answers", "non_2xx").inc()
+                    self._open_answers_circuit()
+                    return None
+                body = response.json()
+        except (httpx.HTTPError, ValueError):
+            KNOWLEDGE_PROVIDER_REQUESTS.labels("answers", "error").inc()
+            self._open_answers_circuit()
+            return None
+
+        try:
+            if not isinstance(body, dict):
+                raise TypeError("answer response must be an object")
+            # Validate the provider's complete AnswerResponse contract before trusting
+            # generated prose. These IDs and claim bindings are the evidence that RAGcore
+            # ran its deterministic claim/citation validator; one unrelated but otherwise
+            # valid citation must never make arbitrary answer text appear grounded.
+            uuid.UUID(str(body["answer_id"]))
+            uuid.UUID(str(body["retrieval_run_id"]))
+            raw_citations = body.get("citations", [])
+            if not isinstance(raw_citations, list):
+                raise TypeError("citations must be a list")
+            citation_ids: set[uuid.UUID] = set()
+            for citation in raw_citations:
+                if not isinstance(citation, dict):
+                    raise TypeError("citation must be an object")
+                citation_ids.add(uuid.UUID(str(citation["id"])))
+            raw_claims = body["claims"]
+            if not isinstance(raw_claims, list):
+                raise TypeError("claims must be a list")
+            claims_are_bound = bool(raw_claims)
+            answer_text = body.get("answer")
+            for claim in raw_claims:
+                if not isinstance(claim, dict):
+                    raise TypeError("claim must be an object")
+                claim_text = claim.get("text")
+                claim_citation_ids = claim.get("citation_ids")
+                if (
+                    not isinstance(claim_text, str)
+                    or not claim_text.strip()
+                    or not isinstance(answer_text, str)
+                    or claim_text.strip() not in answer_text
+                    or not isinstance(claim_citation_ids, list)
+                    or not claim_citation_ids
+                ):
+                    claims_are_bound = False
+                    continue
+                try:
+                    bound_ids = {uuid.UUID(str(item)) for item in claim_citation_ids}
+                except (TypeError, ValueError):
+                    claims_are_bound = False
+                    continue
+                if not bound_ids.issubset(citation_ids):
+                    claims_are_bound = False
+            mapped_sources = [
+                source
+                for citation in raw_citations
+                if (source := self._managed_source(citation, language)) is not None
+            ]
+            citations_are_managed = len(mapped_sources) == len(raw_citations)
+            sources = _deduplicate_sources(mapped_sources)
+            answerability = body.get("answerability", "not_answerable")
+            if answerability not in _ANSWERABILITY_STATES:
+                raise TypeError("answerability is invalid")
+            if not isinstance(answer_text, str):
+                raise TypeError("answer must be a string")
+            is_grounded = (
+                answerability in _GROUNDED_ANSWERABILITY
+                and bool(sources)
+                and citations_are_managed
+                and claims_are_bound
+                and bool(answer_text.strip())
+            )
+            evidence_state: EvidenceState = "grounded" if is_grounded else "insufficient"
+            KNOWLEDGE_PROVIDER_REQUESTS.labels("answers", evidence_state).inc()
+            self._close_answers_circuit()
+            return GroundedAnswer(
+                answer=answer_text if evidence_state == "grounded" else "",
+                evidence_state=evidence_state,
+                sources=sources if evidence_state == "grounded" else [],
+                provider=self.name,
+                correlation_id=correlation_id,
+            )
+        except (TypeError, KeyError, ValueError):
+            KNOWLEDGE_PROVIDER_REQUESTS.labels("answers", "malformed").inc()
+            self._open_answers_circuit()
+            return None
+
+    def _ask_via_search_fallback(
+        self, question: str, correlation_id: str, language: str
+    ) -> GroundedAnswer:
+        unavailable = GroundedAnswer(
+            answer="",
+            evidence_state="unavailable",
+            sources=[],
+            provider=self.name,
+            correlation_id=correlation_id,
+        )
+        try:
+            with self._client() as client:
+                response = client.post(
+                    "/v1/search",
+                    json={
+                        "query": question,
+                        "requested_space_ids": [self._settings.ragcore_space_id],
+                        "filters": {"source_ids": self._managed_source_ids(language)},
+                        "max_results": 5,
+                    },
+                )
+                if response.status_code != 200:
+                    KNOWLEDGE_PROVIDER_REQUESTS.labels("search", "non_2xx").inc()
+                    return unavailable
+                body = response.json()
+        except (httpx.HTTPError, ValueError):
+            KNOWLEDGE_PROVIDER_REQUESTS.labels("search", "error").inc()
+            return unavailable
+
+        try:
+            if not isinstance(body, dict):
+                raise TypeError("search response must be an object")
+            results = body.get("results", [])
+            if not isinstance(results, list):
+                raise TypeError("results must be a list")
+            sources = [
+                source
+                for result in results
+                if isinstance(result, dict)
+                and (source := self._managed_source(result.get("citation"), language)) is not None
+            ]
+        except (TypeError, KeyError, ValueError):
+            KNOWLEDGE_PROVIDER_REQUESTS.labels("search", "malformed").inc()
+            return unavailable
+
+        for result in results:
+            if not isinstance(result, dict):
+                continue
+            score = _retrieval_score(result)
+            if score is not None:
+                KNOWLEDGE_RETRIEVAL_SCORE.observe(score)
+
+        all_sources = _deduplicate_sources(sources)
+        concepts = _question_concepts(question)
+        qualified_sources = [
+            source
+            for result in results
+            if isinstance(result, dict)
+            and (_retrieval_score(result) or 0.0) >= self._settings.ragcore_min_search_score
+            and (source := self._managed_source(result.get("citation"), language)) is not None
+        ]
+        sources = _rank_sources_for_concepts(_deduplicate_sources(qualified_sources), concepts)
+        if not all_sources:
+            KNOWLEDGE_PROVIDER_REQUESTS.labels("search", "insufficient").inc()
+            return GroundedAnswer(
+                answer="",
+                evidence_state="insufficient",
+                sources=[],
+                provider=self.name,
+                correlation_id=correlation_id,
+            )
+
+        required_concepts = concepts & _ANSWERABLE_INTENT_CONCEPTS
+        evidence_text = " ".join(
+            f"{source.document_id} {source.title} {source.section} {source.excerpt}"
+            for source in sources
+        ).casefold()
+        covered_concepts = {
+            concept
+            for concept in required_concepts
+            if any(term in evidence_text for term in _DOMAIN_CONCEPTS[concept])
+        }
+        if not required_concepts or not sources or covered_concepts != required_concepts:
+            KNOWLEDGE_PROVIDER_REQUESTS.labels("search", "insufficient").inc()
+            return GroundedAnswer(
+                answer="",
+                evidence_state="insufficient",
+                sources=all_sources,
+                provider=self.name,
+                correlation_id=correlation_id,
+            )
+
+        template = _LEAD_ANSWER_TEMPLATE.get(language, _LEAD_ANSWER_TEMPLATE[_DEFAULT_LANGUAGE])
+        lead = sources[0]
+        answer = template.format(title=lead.title, excerpt=lead.excerpt)
+        KNOWLEDGE_PROVIDER_REQUESTS.labels("search", "grounded").inc()
+        return GroundedAnswer(
+            answer=answer,
+            evidence_state="grounded",
+            sources=sources,
+            provider=self.name,
+            correlation_id=correlation_id,
+        )

backend/app/services/operations.py

@@ -0,0 +1,77 @@
+from __future__ import annotations
+
+from datetime import date
+
+from sqlalchemy import func, select
+from sqlalchemy.orm import Session
+
+from app.models.data_quality import DataQualityIssue
+from app.models.outbox import OutboxEvent
+from app.models.vehicle import Vehicle
+from app.schemas import DashboardMetrics
+
+SEVERITY_ORDER = {"high": 0, "medium": 1, "low": 2}
+
+
+def compute_metrics(db: Session) -> DashboardMetrics:
+    """Shared operations-summary computation used by both the dashboard and the MCP
+    provider API, so the two never drift out of sync with two copies of the same query."""
+    status_counts: dict[str, int] = dict(
+        db.execute(
+            select(Vehicle.operational_status, func.count()).group_by(Vehicle.operational_status)
+        ).all()  # type: ignore[arg-type]
+    )
+    open_issues = db.scalar(
+        select(func.count()).select_from(DataQualityIssue).where(DataQualityIssue.status == "open")
+    )
+    pending_or_failed = db.scalar(
+        select(func.count())
+        .select_from(OutboxEvent)
+        .where(OutboxEvent.delivery_status.in_(["pending", "failed"]))
+    )
+    return DashboardMetrics(
+        available=status_counts.get("available", 0),
+        rented=status_counts.get("rented", 0),
+        cleaning=status_counts.get("cleaning", 0),
+        maintenance=status_counts.get("maintenance", 0),
+        blocked=status_counts.get("blocked", 0),
+        open_quality_issues=open_issues or 0,
+        pending_or_failed_workflows=pending_or_failed or 0,
+    )
+
+
+def list_attention_vehicles(
+    db: Session, minimum_severity: str = "medium", on_or_before: date | None = None, limit: int = 20
+) -> list[dict]:
+    max_rank = SEVERITY_ORDER.get(minimum_severity, 1)
+    stmt = (
+        select(DataQualityIssue)
+        .where(DataQualityIssue.entity_type == "vehicle", DataQualityIssue.status == "open")
+        .order_by(DataQualityIssue.detected_at.asc())
+    )
+    if on_or_before is not None:
+        stmt = stmt.where(func.date(DataQualityIssue.detected_at) <= on_or_before)
+    issues = db.scalars(stmt).all()
+    filtered = [i for i in issues if SEVERITY_ORDER.get(i.severity, 3) <= max_rank]
+    filtered.sort(key=lambda i: SEVERITY_ORDER.get(i.severity, 3))
+
+    vehicle_ids = {i.entity_id for i in filtered}
+    vehicles_by_id = {
+        v.id: v for v in db.scalars(select(Vehicle).where(Vehicle.id.in_(vehicle_ids))).all()
+    }
+
+    results = []
+    for issue in filtered[:limit]:
+        vehicle = vehicles_by_id.get(issue.entity_id)
+        if vehicle is None:
+            continue
+        results.append(
+            {
+                "vehicle_ref": vehicle.public_ref,
+                "severity": issue.severity,
+                "rule_type": issue.rule_type,
+                "summary": issue.evidence_json.get("summary", ""),
+                "detected_at": issue.detected_at,
+            }
+        )
+    return results

backend/app/services/returns.py

@@ -0,0 +1,372 @@
+from __future__ import annotations
+
+import hashlib
+import json
+import uuid
+from dataclasses import dataclass
+from datetime import UTC, datetime
+
+from sqlalchemy import select
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.orm import Session
+
+from app.core.errors import AppError
+from app.models.booking import Booking
+from app.models.idempotency import IdempotencyRecord
+from app.models.inspection import Inspection
+from app.models.outbox import OutboxEvent
+from app.models.vehicle import Vehicle
+from app.schemas import CurrentUser, RegisterReturnRequest
+from app.services.audit import record_audit_event
+from app.services.data_quality import open_odometer_regression_issue
+
+
+def _new_inspection_ref() -> str:
+    """Generate a collision-resistant public reference without reading mutable counts.
+
+    Return commands for different bookings can commit concurrently. A count-based
+    reference made those independent transactions race for the same unique value.
+    """
+    return f"INSP-{uuid.uuid4().hex[:10].upper()}"
+
+
+def _derive_vehicle_status_with_reason(
+    body: RegisterReturnRequest, vehicle: Vehicle, new_odometer: int
+) -> tuple[str, str, dict[str, str | int]]:
+    # Stable, localizable codes + params -- the backend never emits prose here. The
+    # frontend renders review.reasonCodes.<code> in the selected locale; the mirrored
+    # raw-English fallback strings live only in status_reason (shown under "Technical
+    # details") for backward compatibility. See docs/fleet-ops-correction/i18n-inventory.md.
+    if body.damage_reported and body.technical_warning:
+        return (
+            "blocked",
+            "returnBlockedDamageAndTechnical",
+            {},
+        )
+    if body.damage_reported:
+        return "blocked", "returnBlockedDamage", {}
+    if body.technical_warning:
+        return "blocked", "returnBlockedTechnicalWarning", {}
+    if new_odometer >= vehicle.next_service_km:
+        return (
+            "maintenance",
+            "returnServiceThresholdReached",
+            {"threshold_km": vehicle.next_service_km},
+        )
+    return "cleaning", "returnRoutedToCleaning", {}
+
+
+_STATUS_REASON_FALLBACK_TEXT: dict[str, str] = {
+    "returnBlockedDamageAndTechnical": (
+        "Damage and a technical warning were both reported on return."
+    ),
+    "returnBlockedDamage": "Damage was reported on return.",
+    "returnBlockedTechnicalWarning": "A technical warning was reported on return.",
+    "returnServiceThresholdReached": "Odometer reached the service threshold.",
+    "returnRoutedToCleaning": (
+        "No damage, technical warning or service threshold; routed to cleaning."
+    ),
+}
+
+
+@dataclass
+class ReturnEvaluation:
+    canonical_odometer_km: int
+    submitted_odometer_km: int
+    odometer_regression: bool
+    resulting_odometer_km: int
+    resulting_vehicle_status: str
+    status_reason: str
+    status_reason_code: str
+    status_reason_params: dict[str, str | int]
+    would_create_quality_issue: bool
+    attention_reasons: list[str]
+    next_booking_risk: dict | None
+
+
+def evaluate_return(
+    db: Session, booking: Booking, vehicle: Vehicle, body: RegisterReturnRequest, *, now: datetime
+) -> ReturnEvaluation:
+    """Pure evaluation of what a return would do. No writes; safe to call from a
+    non-mutating preview endpoint. `register_vehicle_return` uses the same function so
+    preview and commit can never drift apart."""
+    odometer_regression = body.end_odometer_km < vehicle.odometer_km
+    resulting_odometer_km = vehicle.odometer_km if odometer_regression else body.end_odometer_km
+    resulting_status, status_reason_code, status_reason_params = _derive_vehicle_status_with_reason(
+        body, vehicle, resulting_odometer_km
+    )
+    status_reason = _STATUS_REASON_FALLBACK_TEXT[status_reason_code]
+
+    attention_reasons = []
+    if body.damage_reported:
+        attention_reasons.append("damage_reported")
+    if body.technical_warning:
+        attention_reasons.append("technical_warning")
+    if odometer_regression:
+        attention_reasons.append("odometer_regression")
+
+    next_booking = db.scalar(
+        select(Booking)
+        .where(
+            Booking.vehicle_id == vehicle.id,
+            Booking.status == "reserved",
+            Booking.starts_at > now,
+        )
+        .order_by(Booking.starts_at.asc())
+    )
+    next_booking_risk = None
+    if next_booking is not None:
+        hours_until = (next_booking.starts_at - now).total_seconds() / 3600
+        next_booking_risk = {
+            "booking_ref": next_booking.public_ref,
+            "starts_at": next_booking.starts_at.isoformat(),
+            "at_risk": resulting_status != "cleaning" or hours_until < 4,
+        }
+
+    return ReturnEvaluation(
+        canonical_odometer_km=vehicle.odometer_km,
+        submitted_odometer_km=body.end_odometer_km,
+        odometer_regression=odometer_regression,
+        resulting_odometer_km=resulting_odometer_km,
+        resulting_vehicle_status=resulting_status,
+        status_reason=status_reason,
+        status_reason_code=status_reason_code,
+        status_reason_params=status_reason_params,
+        would_create_quality_issue=odometer_regression,
+        attention_reasons=attention_reasons,
+        next_booking_risk=next_booking_risk,
+    )
+
+
+def _load_active_booking_and_vehicle(
+    db: Session, booking_ref: str, *, lock: bool
+) -> tuple[Booking, Vehicle]:
+    stmt = select(Booking).where(Booking.public_ref == booking_ref)
+    if lock:
+        stmt = stmt.with_for_update()
+    booking = db.scalar(stmt)
+    if booking is None:
+        raise AppError("BOOKING_NOT_FOUND", "Booking not found.", status_code=404)
+
+    vehicle_stmt = select(Vehicle).where(Vehicle.id == booking.vehicle_id)
+    if lock:
+        vehicle_stmt = vehicle_stmt.with_for_update()
+    vehicle = db.scalar(vehicle_stmt)
+    if vehicle is None:
+        raise AppError(
+            "VEHICLE_NOT_FOUND", "The vehicle for this booking could not be found.", status_code=404
+        )
+    return booking, vehicle
+
+
+def preview_vehicle_return(
+    db: Session, booking_ref: str, body: RegisterReturnRequest
+) -> tuple[Booking, Vehicle, ReturnEvaluation]:
+    booking, vehicle = _load_active_booking_and_vehicle(db, booking_ref, lock=False)
+    if booking.status != "active":
+        raise AppError(
+            "INVALID_BOOKING_STATE",
+            f"Booking is '{booking.status}', not 'active'; it cannot be returned.",
+            status_code=409,
+        )
+    evaluation = evaluate_return(db, booking, vehicle, body, now=datetime.now(UTC))
+    return booking, vehicle, evaluation
+
+
+def request_fingerprint(body: RegisterReturnRequest) -> str:
+    canonical = json.dumps(body.model_dump(mode="json"), sort_keys=True, separators=(",", ":"))
+    return hashlib.sha256(canonical.encode("utf-8")).hexdigest()
+
+
+def _replay_or_reject(
+    db: Session,
+    existing: IdempotencyRecord,
+    booking_ref: str,
+    fingerprint: str,
+) -> tuple[int, dict]:
+    booking = db.get(Booking, existing.booking_id)
+    if booking is None or booking.public_ref != booking_ref:
+        raise AppError(
+            "IDEMPOTENCY_KEY_REUSED",
+            "This idempotency key was already used for a different booking.",
+            status_code=409,
+        )
+    if existing.request_fingerprint is not None and existing.request_fingerprint != fingerprint:
+        raise AppError(
+            "IDEMPOTENCY_KEY_REUSED",
+            "This idempotency key was already used with a different request body.",
+            status_code=409,
+        )
+    return existing.response_status, existing.response_body
+
+
+def register_vehicle_return(
+    db: Session,
+    booking_ref: str,
+    body: RegisterReturnRequest,
+    idempotency_key: str,
+    actor: CurrentUser,
+) -> tuple[int, dict]:
+    fingerprint = request_fingerprint(body)
+    existing = db.scalar(
+        select(IdempotencyRecord).where(IdempotencyRecord.idempotency_key == idempotency_key)
+    )
+    if existing is not None:
+        return _replay_or_reject(db, existing, booking_ref, fingerprint)
+
+    booking, vehicle = _load_active_booking_and_vehicle(db, booking_ref, lock=True)
+
+    # Re-check after acquiring the row lock: a concurrent identical-key request may have
+    # just committed while we were waiting.
+    existing = db.scalar(
+        select(IdempotencyRecord).where(IdempotencyRecord.idempotency_key == idempotency_key)
+    )
+    if existing is not None:
+        return _replay_or_reject(db, existing, booking_ref, fingerprint)
+
+    if booking.status != "active":
+        raise AppError(
+            "INVALID_BOOKING_STATE",
+            f"Booking is '{booking.status}', not 'active'; it cannot be returned.",
+            status_code=409,
+        )
+
+    now = datetime.now(UTC)
+    correlation_id = uuid.uuid4()
+    evaluation = evaluate_return(db, booking, vehicle, body, now=now)
+
+    inspection = Inspection(
+        public_ref=_new_inspection_ref(),
+        booking_id=booking.id,
+        vehicle_id=vehicle.id,
+        type="return",
+        fuel_level_percent=body.fuel_level_percent,
+        cleanliness_ok=body.cleanliness_ok,
+        damage_reported=body.damage_reported,
+        technical_warning=body.technical_warning,
+        notes=body.notes,
+        odometer_km=body.end_odometer_km,
+        completed_at=now,
+        completed_by=actor.display_name,
+    )
+    db.add(inspection)
+
+    before_vehicle = {
+        "operational_status": vehicle.operational_status,
+        "odometer_km": vehicle.odometer_km,
+    }
+
+    booking.status = "returned"
+    booking.end_odometer_km = body.end_odometer_km
+
+    quality_issue_ref: str | None = None
+    if evaluation.odometer_regression:
+        issue = open_odometer_regression_issue(
+            db,
+            vehicle=vehicle,
+            reading_ref=inspection.public_ref,
+            reading_km=body.end_odometer_km,
+            canonical_km=evaluation.canonical_odometer_km,
+            source_type="return",
+            related_refs=[booking.public_ref, inspection.public_ref],
+            correctable_booking_refs=[booking.public_ref],
+            detected_at=now,
+            public_ref=f"DQ-RET-{str(inspection.public_ref).split('-')[-1]}",
+            actor_label=actor.display_name,
+            correlation_id=correlation_id,
+        )
+        quality_issue_ref = issue.public_ref if issue is not None else None
+
+    resulting_status = evaluation.resulting_vehicle_status
+    vehicle.odometer_km = evaluation.resulting_odometer_km
+    vehicle.operational_status = resulting_status
+    vehicle.version += 1
+
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="return_registered",
+        entity_type="booking",
+        entity_id=booking.id,
+        correlation_id=correlation_id,
+        before={"status": "active"},
+        after={"status": "returned", "end_odometer_km": body.end_odometer_km},
+        metadata={"idempotency_key": idempotency_key},
+    )
+    record_audit_event(
+        db,
+        actor_type="user",
+        actor_label=actor.display_name,
+        action="vehicle_status_changed",
+        entity_type="vehicle",
+        entity_id=vehicle.id,
+        correlation_id=correlation_id,
+        before=before_vehicle,
+        after={
+            "operational_status": vehicle.operational_status,
+            "odometer_km": vehicle.odometer_km,
+        },
+    )
+
+    event = OutboxEvent(
+        event_id=uuid.uuid4(),
+        event_type="vehicle.returned.v1",
+        aggregate_type="booking",
+        aggregate_id=booking.id,
+        payload_json={
+            "event_type": "vehicle.returned.v1",
+            "correlation_id": str(correlation_id),
+            "aggregate": {
+                "type": "booking",
+                "id": str(booking.id),
+                "public_ref": booking.public_ref,
+            },
+            "data": {
+                "vehicle_ref": vehicle.public_ref,
+                "inspection_ref": inspection.public_ref,
+                "resulting_vehicle_status": resulting_status,
+                "attention_reasons": evaluation.attention_reasons,
+            },
+            "aggregate_ref": booking.public_ref,
+        },
+        occurred_at=now,
+        delivery_status="pending",
+        attempts=0,
+    )
+    db.add(event)
+
+    response_body = {
+        "booking_ref": booking.public_ref,
+        "vehicle_ref": vehicle.public_ref,
+        "inspection_ref": inspection.public_ref,
+        "resulting_vehicle_status": resulting_status,
+        "odometer_regression": evaluation.odometer_regression,
+        "quality_issue_ref": quality_issue_ref,
+        "workflow_event_id": str(event.event_id),
+        "correlation_id": str(correlation_id),
+        "next_booking_risk": evaluation.next_booking_risk,
+    }
+
+    db.add(
+        IdempotencyRecord(
+            idempotency_key=idempotency_key,
+            booking_id=booking.id,
+            request_fingerprint=fingerprint,
+            response_status=201,
+            response_body=response_body,
+        )
+    )
+
+    try:
+        db.commit()
+    except IntegrityError:
+        db.rollback()
+        existing = db.scalar(
+            select(IdempotencyRecord).where(IdempotencyRecord.idempotency_key == idempotency_key)
+        )
+        if existing is not None:
+            return _replay_or_reject(db, existing, booking_ref, fingerprint)
+        raise
+
+    return 201, response_body

backend/app/services/sessions.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime
+
+from sqlalchemy import delete, select
+from sqlalchemy.orm import Session
+
+from app.core.config import get_settings
+from app.core.security import SessionPayload, session_token_hash
+from app.models.revoked_session import RevokedSession
+
+settings = get_settings()
+
+
+def is_session_revoked(db: Session, token: str) -> bool:
+    token_hash = session_token_hash(token)
+    revoked_id = db.scalar(select(RevokedSession.id).where(RevokedSession.token_hash == token_hash))
+    return revoked_id is not None
+
+
+def revoke_session(db: Session, token: str, payload: SessionPayload) -> None:
+    db.execute(delete(RevokedSession).where(RevokedSession.expires_at < datetime.now(UTC)))
+    token_hash = session_token_hash(token)
+    existing = db.scalar(select(RevokedSession.id).where(RevokedSession.token_hash == token_hash))
+    if existing is not None:
+        return
+    db.add(
+        RevokedSession(
+            token_hash=token_hash,
+            expires_at=datetime.fromtimestamp(
+                payload.issued_at + settings.session_ttl_seconds, UTC
+            ),
+        )
+    )

backend/app/services/vehicle_status.py

@@ -0,0 +1,210 @@
+"""The single authoritative vehicle-status evaluator.
+
+Used by the data-quality scanner (detection), the status-recommendation preview
+endpoint, the apply endpoint, and tests -- so scan-time detection and resolve-time
+recommendation can never structurally disagree (see docs/fleet-ops-correction/
+vehicle-status-decision-table.md for the full decision table and rationale).
+
+The evaluator only ever reasons from real, freshly-queried domain facts (an actually
+active rental, a real service-threshold breach, a real overlapping-booking conflict) --
+never from a proxy like "does some other high-severity issue happen to be open". It is
+therefore also order-independent: resolving, deferring or rejecting an unrelated issue on
+the same vehicle never changes what this function returns, because it never looks at
+issue history, only at the vehicle's/bookings' current state.
+"""
+
+from __future__ import annotations
+
+import hashlib
+import json
+import uuid
+from dataclasses import dataclass, field
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.models.booking import Booking
+from app.models.data_quality import DataQualityIssue
+from app.models.vehicle import Vehicle
+
+# Every code below is a stable, localizable identifier -- see
+# frontend/src/i18n/messageCodes.ts and quality:statusRecommendation.codes.* for the
+# human-language mapping in all three supported locales. The backend never emits prose.
+RECOMMENDATION_CODE_ACTIVE_RENTAL = "vehicle.active_rental"
+RECOMMENDATION_CODE_SERVICE_THRESHOLD = "vehicle.service_threshold_reached"
+RECOMMENDATION_CODE_BOOKING_CONFLICT = "vehicle.booking_conflict"
+RECOMMENDATION_CODE_RENTAL_ENDED = "vehicle.rental_ended"
+RECOMMENDATION_CODE_MANUAL_REVIEW = "vehicle.manual_review_required"
+RECOMMENDATION_CODE_NO_CONFLICT = "vehicle.no_conflict"
+
+
+@dataclass
+class VehicleStatusFacts:
+    active_booking_refs: list[str] = field(default_factory=list)
+    overlapping_booking_pairs: list[tuple[str, str]] = field(default_factory=list)
+    service_threshold_reached: bool = False
+    odometer_km: int = 0
+    next_service_km: int = 0
+    open_booking_overlap_issue_ref: str | None = None
+
+    @property
+    def has_active_rental(self) -> bool:
+        return len(self.active_booking_refs) > 0
+
+    @property
+    def has_booking_conflict(self) -> bool:
+        return (
+            len(self.overlapping_booking_pairs) > 0
+            or self.open_booking_overlap_issue_ref is not None
+        )
+
+    def as_dict(self) -> dict:
+        return {
+            "active_booking_refs": self.active_booking_refs,
+            "overlapping_booking_pairs": [list(pair) for pair in self.overlapping_booking_pairs],
+            "service_threshold_reached": self.service_threshold_reached,
+            "odometer_km": self.odometer_km,
+            "next_service_km": self.next_service_km,
+            "open_booking_overlap_issue_ref": self.open_booking_overlap_issue_ref,
+        }
+
+
+@dataclass
+class VehicleStatusRecommendation:
+    current_status: str
+    recommended_status: str | None
+    recommendation_code: str
+    safe_to_apply: bool
+    manual_review_required: bool
+    facts: VehicleStatusFacts
+    blocking_reasons: list[str]
+
+
+def _overlapping_booking_pairs(bookings: list[Booking]) -> list[tuple[Booking, Booking]]:
+    ordered = sorted(bookings, key=lambda b: b.starts_at)
+    pairs: list[tuple[Booking, Booking]] = []
+    for i, first in enumerate(ordered):
+        for second in ordered[i + 1 :]:
+            if second.starts_at < first.ends_at and first.starts_at < second.ends_at:
+                pairs.append((first, second))
+    return pairs
+
+
+def gather_vehicle_status_facts(
+    db: Session, vehicle: Vehicle, *, exclude_issue_id: uuid.UUID | None = None
+) -> VehicleStatusFacts:
+    """Real, freshly-queried facts only -- see module docstring. Never cached, never
+    derived from another issue's mere existence (only a *specific* booking_overlap
+    issue's presence is used, as a cross-reference to that issue's own public_ref)."""
+    reserved_or_active = list(
+        db.scalars(
+            select(Booking).where(
+                Booking.vehicle_id == vehicle.id,
+                Booking.status.in_(["reserved", "active"]),
+            )
+        ).all()
+    )
+    active_refs = [b.public_ref for b in reserved_or_active if b.status == "active"]
+    overlap_pairs = [
+        (a.public_ref, b.public_ref) for a, b in _overlapping_booking_pairs(reserved_or_active)
+    ]
+
+    overlap_issue_query = select(DataQualityIssue.public_ref).where(
+        DataQualityIssue.entity_type == "vehicle",
+        DataQualityIssue.entity_id == vehicle.id,
+        DataQualityIssue.status == "open",
+        DataQualityIssue.rule_type == "booking_overlap",
+    )
+    if exclude_issue_id is not None:
+        overlap_issue_query = overlap_issue_query.where(DataQualityIssue.id != exclude_issue_id)
+    open_overlap_ref = db.scalar(overlap_issue_query)
+
+    return VehicleStatusFacts(
+        active_booking_refs=active_refs,
+        overlapping_booking_pairs=overlap_pairs,
+        service_threshold_reached=vehicle.odometer_km >= vehicle.next_service_km,
+        odometer_km=vehicle.odometer_km,
+        next_service_km=vehicle.next_service_km,
+        open_booking_overlap_issue_ref=open_overlap_ref,
+    )
+
+
+def compute_recommendation_token(vehicle: Vehicle, facts: VehicleStatusFacts) -> str:
+    """A short digest of exactly the facts the recommendation was based on, plus the
+    vehicle's optimistic-lock version. The apply endpoint recomputes this from fresh
+    facts and rejects the request if it doesn't match the token the client last saw --
+    the frontend must never assume a previously-shown preview is still valid without the
+    server re-checking it (see docs/fleet-ops-correction/current-gap-audit.md §8F)."""
+    payload = {"version": vehicle.version, "status": vehicle.operational_status, **facts.as_dict()}
+    digest = hashlib.sha256(json.dumps(payload, sort_keys=True, default=str).encode()).hexdigest()
+    return digest[:16]
+
+
+def evaluate_vehicle_status(
+    vehicle: Vehicle, facts: VehicleStatusFacts
+) -> VehicleStatusRecommendation:
+    """Pure decision logic over already-gathered facts -- see
+    docs/fleet-ops-correction/vehicle-status-decision-table.md. Never mutates anything,
+    never queries the database itself (call gather_vehicle_status_facts first), so it is
+    trivial to unit-test every branch in isolation."""
+    current = vehicle.operational_status
+    blocking_reasons: list[str] = []
+    if facts.service_threshold_reached:
+        blocking_reasons.append(RECOMMENDATION_CODE_SERVICE_THRESHOLD)
+    if facts.has_booking_conflict:
+        blocking_reasons.append(RECOMMENDATION_CODE_BOOKING_CONFLICT)
+    if current == "maintenance" and RECOMMENDATION_CODE_SERVICE_THRESHOLD not in blocking_reasons:
+        # Already being in maintenance is itself a real blocking fact -- an active
+        # booking never overrides it. This is exactly the forbidden shortcut this
+        # evaluator must never take (maintenance + active booking -> auto "rented").
+        blocking_reasons.append(RECOMMENDATION_CODE_SERVICE_THRESHOLD)
+
+    def result(
+        recommended: str | None, code: str, *, safe: bool, manual: bool
+    ) -> VehicleStatusRecommendation:
+        return VehicleStatusRecommendation(
+            current_status=current,
+            recommended_status=recommended,
+            recommendation_code=code,
+            safe_to_apply=safe,
+            manual_review_required=manual,
+            facts=facts,
+            blocking_reasons=blocking_reasons,
+        )
+
+    if facts.has_active_rental and not blocking_reasons:
+        if current == "rented":
+            return result(None, RECOMMENDATION_CODE_NO_CONFLICT, safe=False, manual=False)
+        return result("rented", RECOMMENDATION_CODE_ACTIVE_RENTAL, safe=True, manual=False)
+
+    if facts.has_active_rental and blocking_reasons:
+        # Explicitly forbidden shortcut this evaluator must never take: an active
+        # booking is not proof the vehicle should be "rented" when a real blocking
+        # condition also exists (e.g. maintenance-due, or a genuine booking conflict).
+        # This is a real contradiction in the underlying facts, not something safe to
+        # resolve automatically.
+        return result(None, RECOMMENDATION_CODE_MANUAL_REVIEW, safe=False, manual=True)
+
+    if facts.service_threshold_reached:
+        if current == "maintenance":
+            return result(None, RECOMMENDATION_CODE_NO_CONFLICT, safe=False, manual=False)
+        return result("maintenance", RECOMMENDATION_CODE_SERVICE_THRESHOLD, safe=True, manual=False)
+
+    if facts.has_booking_conflict:
+        if current == "blocked":
+            return result(None, RECOMMENDATION_CODE_NO_CONFLICT, safe=False, manual=False)
+        return result("blocked", RECOMMENDATION_CODE_BOOKING_CONFLICT, safe=True, manual=False)
+
+    # No active rental, no maintenance need, no booking conflict.
+    if current in ("available", "cleaning", "blocked"):
+        return result(None, RECOMMENDATION_CODE_NO_CONFLICT, safe=False, manual=False)
+    if current == "rented":
+        return result("available", RECOMMENDATION_CODE_RENTAL_ENDED, safe=True, manual=False)
+    if current == "maintenance":
+        # No positive fact confirms maintenance is actually finished (no completed
+        # service record is tracked here) -- clearing "maintenance" without such a
+        # fact would be exactly the kind of unsafe shortcut this evaluator forbids.
+        # Releasing a vehicle from maintenance remains an explicit, manual decision.
+        return result(None, RECOMMENDATION_CODE_NO_CONFLICT, safe=False, manual=False)
+
+    return result(None, RECOMMENDATION_CODE_MANUAL_REVIEW, safe=False, manual=True)

backend/entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+set -e
+
+if [ "${RUN_MIGRATIONS:-true}" = "true" ]; then
+  alembic upgrade head
+fi
+exec uvicorn app.main:app --host 0.0.0.0 --port 8000

backend/pyproject.toml

@@ -0,0 +1,44 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "mobilityops-api"
+version = "0.0.1"
+description = "MobilityOps API scaffold"
+requires-python = ">=3.12"
+dependencies = [
+  "fastapi>=0.115,<1",
+  "uvicorn[standard]>=0.30,<1",
+  "pydantic-settings>=2.5,<3",
+  "sqlalchemy>=2.0,<3",
+  "psycopg[binary]>=3.2,<4",
+  "alembic>=1.13,<2",
+  "httpx>=0.27,<1",
+  "authlib>=1.6,<2",
+  "itsdangerous>=2.2,<3",
+  "prometheus-client>=0.24,<1"
+]
+
+[project.optional-dependencies]
+dev = [
+  "pytest>=8,<9",
+  # Starlette's TestClient (>=1.0) prefers httpx2 and warns when only httpx is present.
+  "httpx2>=2.10,<3",
+  "ruff>=0.8,<1",
+  "mypy>=1.13,<2"
+]
+
+[tool.hatch.build.targets.wheel]
+packages = ["app"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+
+[tool.ruff]
+line-length = 100
+extend-exclude = ["alembic/versions", "seed"]
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "B", "UP"]
+ignore = ["B008"]

backend/requirements-prod.lock

@@ -0,0 +1,173 @@
+#
+# This file is autogenerated by pip-compile with Python 3.12
+# by the following command:
+#
+#    pip-compile --constraint=requirements.lock --output-file=requirements-prod.lock pyproject.toml
+#
+alembic==1.18.5
+    # via
+    #   -c requirements.lock
+    #   mobilityops-api (pyproject.toml)
+annotated-doc==0.0.5
+    # via
+    #   -c requirements.lock
+    #   fastapi
+annotated-types==0.8.0
+    # via
+    #   -c requirements.lock
+    #   pydantic
+anyio==4.14.2
+    # via
+    #   -c requirements.lock
+    #   httpx
+    #   starlette
+    #   watchfiles
+authlib==1.7.2
+    # via
+    #   -c requirements.lock
+    #   mobilityops-api (pyproject.toml)
+certifi==2026.7.22
+    # via
+    #   -c requirements.lock
+    #   httpcore
+    #   httpx
+cffi==2.1.1
+    # via
+    #   -c requirements.lock
+    #   cryptography
+click==8.4.2
+    # via
+    #   -c requirements.lock
+    #   uvicorn
+cryptography==50.0.0
+    # via
+    #   -c requirements.lock
+    #   authlib
+    #   joserfc
+fastapi==0.141.1
+    # via
+    #   -c requirements.lock
+    #   mobilityops-api (pyproject.toml)
+greenlet==3.5.4
+    # via
+    #   -c requirements.lock
+    #   sqlalchemy
+h11==0.16.0
+    # via
+    #   -c requirements.lock
+    #   httpcore
+    #   uvicorn
+httpcore==1.0.9
+    # via
+    #   -c requirements.lock
+    #   httpx
+httptools==0.8.0
+    # via
+    #   -c requirements.lock
+    #   uvicorn
+httpx==0.28.1
+    # via
+    #   -c requirements.lock
+    #   mobilityops-api (pyproject.toml)
+idna==3.18
+    # via
+    #   -c requirements.lock
+    #   anyio
+    #   httpx
+itsdangerous==2.2.0
+    # via
+    #   -c requirements.lock
+    #   mobilityops-api (pyproject.toml)
+joserfc==1.7.4
+    # via
+    #   -c requirements.lock
+    #   authlib
+mako==1.3.12
+    # via
+    #   -c requirements.lock
+    #   alembic
+markupsafe==3.0.3
+    # via
+    #   -c requirements.lock
+    #   mako
+prometheus-client==0.26.0
+    # via
+    #   -c requirements.lock
+    #   mobilityops-api (pyproject.toml)
+psycopg[binary]==3.3.4
+    # via
+    #   -c requirements.lock
+    #   mobilityops-api (pyproject.toml)
+psycopg-binary==3.3.4
+    # via
+    #   -c requirements.lock
+    #   psycopg
+pycparser==3.0
+    # via
+    #   -c requirements.lock
+    #   cffi
+pydantic==2.13.4
+    # via
+    #   -c requirements.lock
+    #   fastapi
+    #   pydantic-settings
+pydantic-core==2.46.4
+    # via
+    #   -c requirements.lock
+    #   pydantic
+pydantic-settings==2.14.2
+    # via
+    #   -c requirements.lock
+    #   mobilityops-api (pyproject.toml)
+python-dotenv==1.2.2
+    # via
+    #   -c requirements.lock
+    #   pydantic-settings
+    #   uvicorn
+pyyaml==6.0.3
+    # via
+    #   -c requirements.lock
+    #   uvicorn
+sqlalchemy==2.0.51
+    # via
+    #   -c requirements.lock
+    #   alembic
+    #   mobilityops-api (pyproject.toml)
+starlette==1.3.1
+    # via
+    #   -c requirements.lock
+    #   fastapi
+typing-extensions==4.16.0
+    # via
+    #   -c requirements.lock
+    #   alembic
+    #   anyio
+    #   fastapi
+    #   psycopg
+    #   pydantic
+    #   pydantic-core
+    #   sqlalchemy
+    #   starlette
+    #   typing-inspection
+typing-inspection==0.4.2
+    # via
+    #   -c requirements.lock
+    #   fastapi
+    #   pydantic
+    #   pydantic-settings
+uvicorn[standard]==0.52.1
+    # via
+    #   -c requirements.lock
+    #   mobilityops-api (pyproject.toml)
+uvloop==0.22.1
+    # via
+    #   -c requirements.lock
+    #   uvicorn
+watchfiles==1.2.0
+    # via
+    #   -c requirements.lock
+    #   uvicorn
+websockets==17.0.1
+    # via
+    #   -c requirements.lock
+    #   uvicorn

backend/requirements.lock

@@ -0,0 +1,142 @@
+#
+# This file is autogenerated by pip-compile with Python 3.12
+# by the following command:
+#
+#    pip-compile --extra=dev --output-file=requirements.lock pyproject.toml
+#
+alembic==1.18.5
+    # via mobilityops-api (pyproject.toml)
+annotated-doc==0.0.5
+    # via fastapi
+annotated-types==0.8.0
+    # via pydantic
+anyio==4.14.2
+    # via
+    #   httpx
+    #   httpx2
+    #   starlette
+    #   watchfiles
+authlib==1.7.2
+    # via mobilityops-api (pyproject.toml)
+certifi==2026.7.22
+    # via
+    #   httpcore
+    #   httpx
+cffi==2.1.1
+    # via cryptography
+click==8.4.2
+    # via uvicorn
+cryptography==50.0.0
+    # via
+    #   authlib
+    #   joserfc
+fastapi==0.141.1
+    # via mobilityops-api (pyproject.toml)
+greenlet==3.5.4
+    # via sqlalchemy
+h11==0.16.0
+    # via
+    #   httpcore
+    #   httpcore2
+    #   uvicorn
+httpcore==1.0.9
+    # via httpx
+httpcore2==2.10.0
+    # via httpx2
+httptools==0.8.0
+    # via uvicorn
+httpx==0.28.1
+    # via mobilityops-api (pyproject.toml)
+httpx2==2.10.0
+    # via mobilityops-api (pyproject.toml)
+idna==3.18
+    # via
+    #   anyio
+    #   httpx
+    #   httpx2
+iniconfig==2.3.0
+    # via pytest
+itsdangerous==2.2.0
+    # via mobilityops-api (pyproject.toml)
+joserfc==1.7.4
+    # via authlib
+librt==0.13.0
+    # via mypy
+mako==1.3.12
+    # via alembic
+markupsafe==3.0.3
+    # via mako
+mypy==1.20.2
+    # via mobilityops-api (pyproject.toml)
+mypy-extensions==1.1.0
+    # via mypy
+packaging==26.2
+    # via pytest
+pathspec==1.1.1
+    # via mypy
+pluggy==1.6.0
+    # via pytest
+prometheus-client==0.26.0
+    # via mobilityops-api (pyproject.toml)
+psycopg[binary]==3.3.4
+    # via mobilityops-api (pyproject.toml)
+psycopg-binary==3.3.4
+    # via psycopg
+pycparser==3.0
+    # via cffi
+pydantic==2.13.4
+    # via
+    #   fastapi
+    #   pydantic-settings
+pydantic-core==2.46.4
+    # via pydantic
+pydantic-settings==2.14.2
+    # via mobilityops-api (pyproject.toml)
+pygments==2.20.0
+    # via pytest
+pytest==8.4.2
+    # via mobilityops-api (pyproject.toml)
+python-dotenv==1.2.2
+    # via
+    #   pydantic-settings
+    #   uvicorn
+pyyaml==6.0.3
+    # via uvicorn
+ruff==0.16.1
+    # via mobilityops-api (pyproject.toml)
+sqlalchemy==2.0.51
+    # via
+    #   alembic
+    #   mobilityops-api (pyproject.toml)
+starlette==1.3.1
+    # via fastapi
+truststore==0.10.4
+    # via
+    #   httpcore2
+    #   httpx2
+typing-extensions==4.16.0
+    # via
+    #   alembic
+    #   anyio
+    #   fastapi
+    #   httpx2
+    #   mypy
+    #   psycopg
+    #   pydantic
+    #   pydantic-core
+    #   sqlalchemy
+    #   starlette
+    #   typing-inspection
+typing-inspection==0.4.2
+    # via
+    #   fastapi
+    #   pydantic
+    #   pydantic-settings
+uvicorn[standard]==0.52.1
+    # via mobilityops-api (pyproject.toml)
+uvloop==0.22.1
+    # via uvicorn
+watchfiles==1.2.0
+    # via uvicorn
+websockets==17.0.1
+    # via uvicorn

backend/scripts/generate_openapi.py

@@ -0,0 +1,31 @@
+"""Generate the checked-in API contract from the FastAPI application."""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+import yaml
+
+ROOT = Path(__file__).resolve().parents[2]
+sys.path.insert(0, str(ROOT / "backend"))
+
+from app.main import app  # noqa: E402
+
+
+def main() -> None:
+    schema = app.openapi()
+    schema["info"]["description"] = (
+        "Generated contract for Fleet Ops. The visible product name is Fleet Ops; "
+        "MobilityOps remains the technical repository and service identifier."
+    )
+    schema["servers"] = [{"url": "http://localhost:8128"}]
+    output = ROOT / "contracts" / "openapi.yaml"
+    output.write_text(
+        yaml.safe_dump(schema, sort_keys=False, allow_unicode=True, width=100),
+        encoding="utf-8",
+    )
+
+
+if __name__ == "__main__":
+    main()

backend/tests/conftest.py

@@ -0,0 +1,38 @@
+import pytest
+from fastapi.testclient import TestClient
+
+from app.core.db import Base, SessionLocal, engine
+from app.main import app
+from app.seed_loader import reset_and_seed
+
+
+@pytest.fixture(scope="session", autouse=True)
+def _seeded_database():
+    Base.metadata.create_all(engine)
+    db = SessionLocal()
+    try:
+        reset_and_seed(db)
+    finally:
+        db.close()
+    yield
+
+
+@pytest.fixture
+def client() -> TestClient:
+    return TestClient(app)
+
+
+def login(client: TestClient, role: str) -> TestClient:
+    response = client.post("/api/v1/demo/login", json={"role": role})
+    assert response.status_code == 200
+    return client
+
+
+@pytest.fixture
+def ops_client(client: TestClient) -> TestClient:
+    return login(client, "operations_manager")
+
+
+@pytest.fixture
+def employee_client(client: TestClient) -> TestClient:
+    return login(client, "rental_employee")

backend/tests/test_audit.py

@@ -0,0 +1,83 @@
+from sqlalchemy import select
+
+from app.core.db import SessionLocal
+from app.models.booking import Booking
+from app.models.vehicle import Vehicle
+
+
+def test_demo_login_is_audited(ops_client):
+    response = ops_client.get("/api/v1/audit", params={"action": "demo_login"})
+    assert response.status_code == 200
+    events = response.json()
+    assert len(events) >= 1
+    assert events[0]["action"] == "demo_login"
+
+
+def test_audit_requires_authentication(client):
+    response = client.get("/api/v1/audit")
+    assert response.status_code == 401
+
+
+def test_audit_requires_operations_manager(employee_client):
+    response = employee_client.get("/api/v1/audit")
+    assert response.status_code == 403
+
+
+def test_audit_page_is_bounded_and_exposes_filter_metadata(ops_client):
+    response = ops_client.get("/api/v1/audit", params={"page": 1, "page_size": 25})
+    assert response.status_code == 200
+    body = response.json()
+    assert len(body["items"]) <= 25
+    assert body["page"] == 1
+    assert body["page_size"] == 25
+    assert body["total"] >= len(body["items"])
+    assert body["total_pages"] >= 1
+
+
+def _activate_booking(vehicle_ref: str, start_odometer_km: int) -> str:
+    db = SessionLocal()
+    try:
+        vehicle = db.scalar(select(Vehicle).where(Vehicle.public_ref == vehicle_ref))
+        booking = db.scalar(
+            select(Booking).where(Booking.vehicle_id == vehicle.id, Booking.status == "returned")
+        )
+        booking.status = "active"
+        booking.start_odometer_km = start_odometer_km
+        booking.end_odometer_km = None
+        db.commit()
+        return booking.public_ref
+    finally:
+        db.close()
+
+
+def test_return_registered_audit_event_exposes_before_after_and_link(ops_client):
+    booking_ref = _activate_booking("MO-015", start_odometer_km=17000)
+    vehicle_before = ops_client.get("/api/v1/vehicles/MO-015").json()
+    ops_client.post(
+        f"/api/v1/bookings/{booking_ref}/return",
+        json={
+            "end_odometer_km": vehicle_before["odometer_km"] + 10,
+            "fuel_level_percent": 50,
+            "cleanliness_ok": True,
+            "damage_reported": False,
+            "technical_warning": False,
+        },
+        headers={"Idempotency-Key": "test-audit-before-after-001"},
+    )
+
+    key = "test-audit-before-after-001"
+    events = ops_client.get("/api/v1/audit", params={"action": "return_registered"}).json()
+    event = next(e for e in events if e["metadata"]["idempotency_key"] == key)
+    assert event["before"] == {"status": "active"}
+    assert event["after"]["status"] == "returned"
+    assert event["entity_ref"] == booking_ref
+    assert event["entity_link"] == f"/bookings/{booking_ref}"
+
+    vehicle_events = ops_client.get(
+        "/api/v1/audit",
+        params={"action": "vehicle_status_changed", "correlation_id": event["correlation_id"]},
+    ).json()
+    assert len(vehicle_events) == 1
+    assert vehicle_events[0]["entity_ref"] == "MO-015"
+    assert vehicle_events[0]["entity_link"] == "/vehicles/MO-015"
+    assert vehicle_events[0]["before"]["odometer_km"] == vehicle_before["odometer_km"]

backend/tests/test_auth.py

@@ -0,0 +1,306 @@
+import threading
+
+import pytest
+from sqlalchemy import delete, func, select
+
+from app.core.db import SessionLocal, engine
+from app.models.audit import AuditEvent
+from app.models.vehicle import Vehicle
+from app.seed_loader import reset_and_seed
+from app.services.audit import record_audit_event
+
+
+def test_unauthenticated_dashboard_is_rejected(client):
+    response = client.get("/api/v1/dashboard")
+    assert response.status_code == 401
+    assert response.json()["error"]["code"] == "401"
+
+
+def test_oidc_status_is_disabled_without_configuration(client):
+    assert client.get("/api/v1/auth/oidc/status").json() == {
+        "enabled": False,
+        "provider_name": None,
+    }
+    assert client.get("/api/v1/auth/oidc/login").status_code == 404
+
+
+def test_oidc_callback_auto_provisions_and_logs_in(client, monkeypatch):
+    import app.api.routers.auth as auth_router
+
+    class FakeClient:
+        async def authorize_access_token(self, _request):
+            return {
+                "userinfo": {
+                    "sub": "external-subject-1",
+                    "email": "oidc.user@example.test",
+                    "email_verified": True,
+                    "name": "OIDC User",
+                }
+            }
+
+    class FakeOAuth:
+        def create_client(self, _name):
+            return FakeClient()
+
+    monkeypatch.setattr(auth_router.settings, "oidc_enabled", True)
+    monkeypatch.setattr(auth_router.settings, "oidc_issuer_url", "https://id.example.test")
+    monkeypatch.setattr(auth_router.settings, "oidc_client_id", "client")
+    monkeypatch.setattr(auth_router.settings, "oidc_client_secret", "secret")
+    monkeypatch.setattr(auth_router.settings, "oidc_allowed_email_domains", "example.test")
+    monkeypatch.setattr(auth_router, "oauth", FakeOAuth())
+
+    response = client.get("/api/v1/auth/oidc/callback", follow_redirects=False)
+    assert response.status_code == 307
+    assert response.headers["location"].endswith("/dashboard")
+    session = client.get("/api/v1/auth/session")
+    assert session.status_code == 200
+    assert session.json()["display_name"] == "OIDC User"
+    assert session.json()["role"] == "rental_employee"
+
+
+def test_oidc_callback_rejects_missing_email_verification_claim(client, monkeypatch):
+    import app.api.routers.auth as auth_router
+
+    class FakeClient:
+        async def authorize_access_token(self, _request):
+            return {"userinfo": {"sub": "unverified-subject", "email": "new@example.test"}}
+
+    class FakeOAuth:
+        def create_client(self, _name):
+            return FakeClient()
+
+    monkeypatch.setattr(auth_router.settings, "oidc_enabled", True)
+    monkeypatch.setattr(auth_router.settings, "oidc_issuer_url", "https://id.example.test")
+    monkeypatch.setattr(auth_router.settings, "oidc_client_id", "client")
+    monkeypatch.setattr(auth_router.settings, "oidc_client_secret", "secret")
+    monkeypatch.setattr(auth_router.settings, "oidc_allowed_email_domains", "example.test")
+    monkeypatch.setattr(auth_router, "oauth", FakeOAuth())
+
+    response = client.get("/api/v1/auth/oidc/callback", follow_redirects=False)
+    assert response.status_code == 401
+    assert client.get("/api/v1/auth/session").status_code == 401
+
+
+def test_demo_login_grants_access(ops_client):
+    response = ops_client.get("/api/v1/dashboard")
+    assert response.status_code == 200
+
+
+def test_rental_employee_cannot_reset_demo(employee_client):
+    response = employee_client.post("/api/v1/demo/reset")
+    assert response.status_code == 403
+
+
+def test_operations_manager_can_reset_demo(ops_client):
+    response = ops_client.post("/api/v1/demo/reset")
+    assert response.status_code == 200
+    body = response.json()
+    assert body["counts"]["vehicles"] == 50
+    assert body["anchor_date"]
+    assert body["seeded_at"]
+    assert body["scenario_integrity"]["all_ready"] is True
+    assert body["scenario_integrity"]["not_ready"] == []
+
+
+def test_demo_reset_rejects_concurrent_rebuild(ops_client):
+    import app.api.routers.demo as demo_router
+
+    assert demo_router._reset_guard.acquire(blocking=False)
+    try:
+        response = ops_client.post("/api/v1/demo/reset")
+    finally:
+        demo_router._reset_guard.release()
+    assert response.status_code == 409
+
+
+def test_demo_reset_database_lock_blocks_another_api_replica(ops_client):
+    import app.api.routers.demo as demo_router
+
+    # Use a raw connection: an ordinary Session intentionally participates in the
+    # shared mutation barrier and would make an exclusive reset wait before it can test
+    # this separate non-blocking replica lock.
+    with engine.connect() as lock_connection:
+        lock_connection.scalar(select(func.pg_advisory_lock(demo_router._RESET_ADVISORY_LOCK_ID)))
+        try:
+            response = ops_client.post("/api/v1/demo/reset")
+        finally:
+            lock_connection.scalar(
+                select(func.pg_advisory_unlock(demo_router._RESET_ADVISORY_LOCK_ID))
+            )
+    assert response.status_code == 409
+
+
+def test_demo_reset_waits_for_active_mutation_and_then_replaces_it_atomically():
+    started = threading.Event()
+    completed = threading.Event()
+    errors: list[BaseException] = []
+
+    def reset_in_other_session() -> None:
+        started.set()
+        try:
+            with SessionLocal() as reset_db:
+                reset_and_seed(reset_db)
+        except BaseException as exc:  # pragma: no cover - assertion reports thread failures
+            errors.append(exc)
+        finally:
+            completed.set()
+
+    with SessionLocal() as mutation_db:
+        vehicle = mutation_db.scalar(
+            select(Vehicle).where(Vehicle.public_ref == "MO-001").with_for_update()
+        )
+        vehicle.location = "Concurrent mutation marker"
+        mutation_db.flush()
+        worker = threading.Thread(target=reset_in_other_session, daemon=True)
+        worker.start()
+        assert started.wait(timeout=1)
+        assert not completed.wait(timeout=0.2)
+        mutation_db.commit()
+
+    worker.join(timeout=10)
+    assert not worker.is_alive(), "reset deadlocked behind the active mutation"
+    assert errors == []
+    with SessionLocal() as db:
+        restored = db.scalar(select(Vehicle).where(Vehicle.public_ref == "MO-001"))
+        assert restored.location != "Concurrent mutation marker"
+
+
+def test_demo_reset_cooldown_returns_retry_after(ops_client, monkeypatch):
+    import app.api.routers.demo as demo_router
+
+    monkeypatch.setattr(demo_router.settings, "demo_reset_cooldown_seconds", 60)
+    with SessionLocal() as db:
+        cooldown_event = record_audit_event(
+            db,
+            actor_type="user",
+            actor_label="Cooldown test",
+            action="demo_reset",
+            entity_type="system",
+        )
+        db.commit()
+        cooldown_event_id = cooldown_event.id
+    response = ops_client.post("/api/v1/demo/reset")
+    assert response.status_code == 429
+    assert int(response.headers["retry-after"]) >= 1
+    with SessionLocal() as db:
+        db.execute(delete(AuditEvent).where(AuditEvent.id == cooldown_event_id))
+        db.commit()
+
+
+def test_demo_reset_rolls_back_every_change_when_integrity_check_fails(ops_client, monkeypatch):
+    import app.api.routers.demo as demo_router
+
+    monkeypatch.setattr(demo_router.settings, "demo_reset_cooldown_seconds", 0)
+    with SessionLocal() as db:
+        probe = record_audit_event(
+            db,
+            actor_type="system",
+            actor_label="Atomic reset test",
+            action="reset_atomicity_probe",
+            entity_type="system",
+        )
+        db.commit()
+        probe_id = probe.id
+
+    def fail_integrity_check(_db):
+        raise RuntimeError("Injected integrity-check failure")
+
+    monkeypatch.setattr(demo_router, "scenario_integrity_report", fail_integrity_check)
+    with pytest.raises(RuntimeError, match="Injected integrity-check failure"):
+        ops_client.post("/api/v1/demo/reset")
+
+    with SessionLocal() as db:
+        assert db.scalar(select(AuditEvent).where(AuditEvent.id == probe_id)) is not None
+        db.execute(delete(AuditEvent).where(AuditEvent.id == probe_id))
+        db.commit()
+
+
+def test_reset_is_rejected_when_demo_allow_reset_is_disabled(ops_client, monkeypatch):
+    import app.api.routers.demo as demo_router
+
+    monkeypatch.setattr(demo_router.settings, "demo_allow_reset", False)
+    response = ops_client.post("/api/v1/demo/reset")
+    assert response.status_code == 403
+
+    # Restore real demo data: this test intentionally disabled reset, so a following test
+    # module must not inherit a database left mid-mutation by an earlier test.
+    monkeypatch.setattr(demo_router.settings, "demo_allow_reset", True)
+    assert ops_client.post("/api/v1/demo/reset").status_code == 200
+
+
+def test_session_endpoint_requires_authentication(client):
+    response = client.get("/api/v1/demo/session")
+    assert response.status_code == 401
+
+
+def test_session_endpoint_confirms_logged_in_user(ops_client):
+    response = ops_client.get("/api/v1/demo/session")
+    assert response.status_code == 200
+    body = response.json()
+    assert body["role"] == "operations_manager"
+    assert body["public_ref"] == "USR-OPS"
+
+
+def test_logout_invalidates_session(ops_client):
+    confirmed = ops_client.get("/api/v1/demo/session")
+    assert confirmed.status_code == 200
+
+    logout = ops_client.post("/api/v1/demo/logout")
+    assert logout.status_code == 200
+
+    after = ops_client.get("/api/v1/demo/session")
+    assert after.status_code == 401
+
+
+def test_logout_rejects_a_cookie_even_if_the_browser_retains_it(ops_client):
+    from app.core.config import get_settings
+
+    cookie_name = get_settings().session_cookie_name
+    stolen_token = ops_client.cookies.get(cookie_name)
+    assert stolen_token
+
+    logout = ops_client.post("/api/v1/auth/logout")
+    assert logout.status_code == 200
+
+    # Simulate the browser cookie race (or a copied cookie): server-side revocation is
+    # authoritative and must reject the original signed token independently of deletion.
+    ops_client.cookies.set(cookie_name, stolen_token)
+    assert ops_client.get("/api/v1/auth/session").status_code == 401
+
+    # Remove the deliberately injected hostless cookie before exercising a normal browser
+    # login. Otherwise httpx sends it alongside the real testserver cookie, which is not a
+    # state a browser can create for the same origin/path pair.
+    ops_client.cookies.clear()
+
+    # A fresh login in the same second receives a distinct signed token and remains valid.
+    fresh_login = ops_client.post("/api/v1/demo/login", json={"role": "operations_manager"})
+    assert fresh_login.status_code == 200
+    assert ops_client.get("/api/v1/auth/session").status_code == 200
+
+
+def test_logout_without_a_session_is_safe(client):
+    response = client.post("/api/v1/demo/logout")
+    assert response.status_code == 200
+
+
+def test_demo_reset_preserves_integration_telemetry(ops_client, client):
+    from app.core.config import get_settings
+
+    settings = get_settings()
+    probe = client.get(
+        "/api/v1/integrations/mcp/operations-summary",
+        headers={
+            "X-Service-Token": settings.mcp_hub_service_token,
+            "X-Client-Id": "itworx-mcp-hub:mobilityops:reset-probe",
+        },
+    )
+    assert probe.status_code == 200
+    assert ops_client.post("/api/v1/demo/reset").status_code == 200
+
+    assert client.post("/api/v1/demo/login", json={"role": "operations_manager"}).status_code == 200
+    events = client.get("/api/v1/audit", params={"action": "mcp_tool_request"}).json()
+    assert any(
+        event["actor_label"] == "itworx-mcp-hub"
+        and event["metadata"].get("reported_client_id", "").endswith(":reset-probe")
+        for event in events
+    )

backend/tests/test_bookings.py

@@ -0,0 +1,382 @@
+import threading
+from datetime import datetime, timedelta
+
+from fastapi.testclient import TestClient
+
+from app.main import app
+
+
+def test_list_bookings_filters_by_vehicle(ops_client):
+    response = ops_client.get("/api/v1/bookings", params={"vehicle_ref": "MO-024"})
+    assert response.status_code == 200
+    bookings = response.json()
+    assert len(bookings) >= 1
+    assert all(b["vehicle_ref"] == "MO-024" for b in bookings)
+
+
+def test_list_bookings_supports_bounded_search_pages(ops_client):
+    response = ops_client.get(
+        "/api/v1/bookings",
+        params={"query": "BK-", "page": 1, "page_size": 25},
+    )
+    assert response.status_code == 200
+    body = response.json()
+    assert body["page"] == 1
+    assert body["page_size"] == 25
+    assert body["total"] > 25
+    assert body["total_pages"] > 1
+    assert len(body["items"]) == 25
+
+
+def test_list_bookings_filters_operational_window_and_location(ops_client):
+    booking = ops_client.get("/api/v1/bookings").json()[0]
+    vehicle = ops_client.get(f"/api/v1/vehicles/{booking['vehicle_ref']}").json()
+    starts_at = datetime.fromisoformat(booking["starts_at"])
+    response = ops_client.get(
+        "/api/v1/bookings",
+        params={
+            "starts_from": (starts_at - timedelta(minutes=1)).isoformat(),
+            "starts_to": (starts_at + timedelta(minutes=1)).isoformat(),
+            "location": vehicle["location"],
+            "sort": "starts_asc",
+        },
+    )
+    assert response.status_code == 200
+    assert booking["public_ref"] in {item["public_ref"] for item in response.json()}
+
+
+def test_create_booking_rejects_overlap_and_audits_valid_booking(ops_client):
+    existing = ops_client.get("/api/v1/bookings/BK-DEMO-RETURN").json()
+    conflict = ops_client.post(
+        "/api/v1/bookings",
+        json={
+            "customer_ref": "CUS-0001",
+            "vehicle_ref": existing["vehicle_ref"],
+            "starts_at": existing["starts_at"],
+            "ends_at": existing["ends_at"],
+        },
+    )
+    assert conflict.status_code == 409
+    available_vehicle = ops_client.get("/api/v1/vehicles", params={"status": "available"}).json()[
+        0
+    ]["public_ref"]
+    created = ops_client.post(
+        "/api/v1/bookings",
+        json={
+            "customer_ref": "CUS-0001",
+            "vehicle_ref": available_vehicle,
+            "starts_at": "2030-09-01T10:00:00Z",
+            "ends_at": "2030-09-02T12:00:00Z",
+        },
+    )
+    assert created.status_code == 201
+    body = created.json()
+    assert body["status"] == "reserved"
+    assert body["vehicle_ref"] == available_vehicle
+    assert body["requirements_complete"] is False
+
+
+def test_booking_requirements_are_explicit_and_audited(ops_client):
+    window = {"starts_at": "2031-09-01T10:00:00Z", "ends_at": "2031-09-02T12:00:00Z"}
+    vehicle = ops_client.get("/api/v1/bookings/availability", params=window).json()[0]
+    booking = ops_client.post(
+        "/api/v1/bookings",
+        json={"customer_ref": "CUS-0001", "vehicle_ref": vehicle["public_ref"], **window},
+    ).json()
+    checkout = ops_client.post(
+        f"/api/v1/bookings/{booking['public_ref']}/checkout",
+        json={
+            "start_odometer_km": 100000,
+            "fuel_level_percent": 90,
+            "cleanliness_ok": True,
+            "damage_reported": False,
+            "technical_warning": False,
+        },
+    )
+    assert checkout.status_code == 409
+
+    whitespace_only = ops_client.post(
+        f"/api/v1/bookings/{booking['public_ref']}/complete-requirements",
+        json={"confirmation": "   "},
+    )
+    assert whitespace_only.status_code == 422
+    assert (
+        ops_client.get(f"/api/v1/bookings/{booking['public_ref']}").json()["requirements_complete"]
+        is False
+    )
+
+    confirmed = ops_client.post(
+        f"/api/v1/bookings/{booking['public_ref']}/complete-requirements",
+        json={"confirmation": "Licence and rental conditions checked"},
+    )
+    assert confirmed.status_code == 200
+    assert confirmed.json()["requirements_complete"] is True
+    audit = ops_client.get("/api/v1/audit", params={"action": "booking_requirements_completed"})
+    assert audit.status_code == 200
+    assert any(item["entity_ref"] == booking["public_ref"] for item in audit.json())
+
+
+def test_booking_creation_cannot_preconfirm_requirements(ops_client):
+    window = {"starts_at": "2033-09-01T10:00:00Z", "ends_at": "2033-09-02T12:00:00Z"}
+    vehicle = ops_client.get("/api/v1/bookings/availability", params=window).json()[0]
+
+    created = ops_client.post(
+        "/api/v1/bookings",
+        json={
+            "customer_ref": "CUS-0001",
+            "vehicle_ref": vehicle["public_ref"],
+            "requirements_complete": True,
+            **window,
+        },
+    )
+
+    assert created.status_code == 201
+    assert created.json()["requirements_complete"] is False
+    audit = ops_client.get(
+        "/api/v1/audit",
+        params={"action": "booking_requirements_completed"},
+    )
+    assert all(item["entity_ref"] != created.json()["public_ref"] for item in audit.json())
+
+
+def test_customer_search_returns_canonical_customers(ops_client):
+    response = ops_client.get("/api/v1/customers", params={"query": "CUS-"})
+    assert response.status_code == 200
+    assert response.json()
+    assert all(item["public_ref"].startswith("CUS-") for item in response.json())
+
+
+def test_booking_availability_excludes_overlapping_vehicle(ops_client):
+    existing = ops_client.get("/api/v1/bookings/BK-DEMO-RETURN").json()
+    response = ops_client.get(
+        "/api/v1/bookings/availability",
+        params={"starts_at": existing["starts_at"], "ends_at": existing["ends_at"]},
+    )
+    assert response.status_code == 200
+    assert existing["vehicle_ref"] not in {item["public_ref"] for item in response.json()}
+
+
+def test_reserved_booking_can_be_cancelled_once(ops_client):
+    window = {"starts_at": "2032-09-01T10:00:00Z", "ends_at": "2032-09-02T12:00:00Z"}
+    available = ops_client.get("/api/v1/bookings/availability", params=window).json()
+    assert available
+    create_response = ops_client.post(
+        "/api/v1/bookings",
+        json={
+            "customer_ref": "CUS-0001",
+            "vehicle_ref": available[0]["public_ref"],
+            **window,
+        },
+    )
+    assert create_response.status_code == 201
+    created = create_response.json()
+    response = ops_client.post(
+        f"/api/v1/bookings/{created['public_ref']}/cancel",
+        json={"reason": "Customer changed plans"},
+    )
+    assert response.status_code == 200
+    assert response.json()["status"] == "cancelled"
+    repeated = ops_client.post(
+        f"/api/v1/bookings/{created['public_ref']}/cancel",
+        json={"reason": "Customer changed plans"},
+    )
+    assert repeated.status_code == 409
+
+
+def test_reserved_booking_can_be_rescheduled_with_overlap_protection(ops_client):
+    window = {"starts_at": "2033-09-01T10:00:00Z", "ends_at": "2033-09-02T12:00:00Z"}
+    existing = ops_client.get("/api/v1/bookings/BK-DEMO-RETURN").json()
+    booking = ops_client.post(
+        "/api/v1/bookings",
+        json={"customer_ref": "CUS-0001", "vehicle_ref": existing["vehicle_ref"], **window},
+    ).json()
+    updated = ops_client.patch(
+        f"/api/v1/bookings/{booking['public_ref']}/schedule",
+        json={
+            "starts_at": "2033-09-03T10:00:00Z",
+            "ends_at": "2033-09-04T12:00:00Z",
+            "reason": "Customer requested a later collection",
+        },
+    )
+    assert updated.status_code == 200
+    assert updated.json()["starts_at"].startswith("2033-09-03T10:00:00")
+
+    conflict = ops_client.patch(
+        f"/api/v1/bookings/{booking['public_ref']}/schedule",
+        json={
+            "starts_at": existing["starts_at"],
+            "ends_at": existing["ends_at"],
+            "reason": "Conflicting test move",
+        },
+    )
+    assert conflict.status_code == 409
+
+
+def test_concurrent_bookings_only_reserve_vehicle_once():
+    results: list[int] = []
+    seed_client = TestClient(app)
+    seed_client.post("/api/v1/demo/login", json={"role": "operations_manager"})
+    window = {"starts_at": "2040-09-01T10:00:00Z", "ends_at": "2040-09-02T12:00:00Z"}
+    available = seed_client.get("/api/v1/bookings/availability", params=window).json()
+    assert available
+    vehicle_ref = available[0]["public_ref"]
+
+    def submit() -> None:
+        client = TestClient(app)
+        client.post("/api/v1/demo/login", json={"role": "operations_manager"})
+        response = client.post(
+            "/api/v1/bookings",
+            json={
+                "customer_ref": "CUS-0001",
+                "vehicle_ref": vehicle_ref,
+                **window,
+            },
+        )
+        results.append(response.status_code)
+
+    threads = [threading.Thread(target=submit) for _ in range(2)]
+    for thread in threads:
+        thread.start()
+    for thread in threads:
+        thread.join()
+
+    assert results.count(201) == 1
+    assert results.count(409) == 1
+
+
+def test_checkout_records_inspection_and_activates_safe_booking(ops_client):
+    window = {"starts_at": "2050-09-01T10:00:00Z", "ends_at": "2050-09-02T12:00:00Z"}
+    available = ops_client.get("/api/v1/bookings/availability", params=window).json()
+    vehicle_option = next(item for item in available if item["operational_status"] == "available")
+    vehicle = ops_client.get(f"/api/v1/vehicles/{vehicle_option['public_ref']}").json()
+    booking = ops_client.post(
+        "/api/v1/bookings",
+        json={
+            "customer_ref": "CUS-0001",
+            "vehicle_ref": vehicle["public_ref"],
+            **window,
+        },
+    ).json()
+    confirmed = ops_client.post(
+        f"/api/v1/bookings/{booking['public_ref']}/complete-requirements",
+        json={"confirmation": "Licence and rental conditions checked"},
+    )
+    assert confirmed.status_code == 200
+    response = ops_client.post(
+        f"/api/v1/bookings/{booking['public_ref']}/checkout",
+        json={
+            "start_odometer_km": vehicle["odometer_km"],
+            "fuel_level_percent": 95,
+            "cleanliness_ok": True,
+            "damage_reported": False,
+            "technical_warning": False,
+        },
+    )
+    assert response.status_code == 200
+    assert response.json()["activated"] is True
+    assert response.json()["booking_status"] == "active"
+    updated_vehicle = ops_client.get(f"/api/v1/vehicles/{vehicle['public_ref']}").json()
+    assert updated_vehicle["operational_status"] == "rented"
+    assert any(item["type"] == "checkout" for item in updated_vehicle["inspections"])
+    checkout_audit = ops_client.get(
+        "/api/v1/audit",
+        params={"action": "booking_checkout_recorded"},
+    ).json()
+    booking_event = next(
+        item for item in checkout_audit if item["entity_ref"] == booking["public_ref"]
+    )
+    vehicle_audit = ops_client.get(
+        "/api/v1/audit",
+        params={
+            "action": "vehicle_status_changed",
+            "correlation_id": booking_event["correlation_id"],
+        },
+    ).json()
+    assert len(vehicle_audit) == 1
+    assert vehicle_audit[0]["entity_ref"] == vehicle["public_ref"]
+    assert vehicle_audit[0]["before"]["operational_status"] == "available"
+    assert vehicle_audit[0]["after"]["operational_status"] == "rented"
+
+
+def test_checkout_odometer_regression_keeps_canonical_and_opens_bounded_quality_issue(
+    ops_client,
+):
+    window = {"starts_at": "2052-09-01T10:00:00Z", "ends_at": "2052-09-02T12:00:00Z"}
+    existing_issues = ops_client.get(
+        "/api/v1/data-quality/issues",
+        params={"status": "open", "rule_type": "odometer_regression"},
+    ).json()
+    unavailable_refs = {issue["entity_ref"] for issue in existing_issues}
+    available = ops_client.get("/api/v1/bookings/availability", params=window).json()
+    vehicle_option = next(
+        item
+        for item in available
+        if item["operational_status"] == "available" and item["public_ref"] not in unavailable_refs
+    )
+    vehicle = ops_client.get(f"/api/v1/vehicles/{vehicle_option['public_ref']}").json()
+    assert vehicle["odometer_km"] > 0
+    booking = ops_client.post(
+        "/api/v1/bookings",
+        json={
+            "customer_ref": "CUS-0003",
+            "vehicle_ref": vehicle["public_ref"],
+            **window,
+        },
+    ).json()
+    ops_client.post(
+        f"/api/v1/bookings/{booking['public_ref']}/complete-requirements",
+        json={"confirmation": "Licence and rental conditions checked"},
+    )
+
+    checkout = ops_client.post(
+        f"/api/v1/bookings/{booking['public_ref']}/checkout",
+        json={
+            "start_odometer_km": vehicle["odometer_km"] - 1,
+            "fuel_level_percent": 90,
+            "cleanliness_ok": True,
+            "damage_reported": False,
+            "technical_warning": False,
+        },
+    )
+
+    assert checkout.status_code == 200
+    assert checkout.json()["booking_status"] == "blocked"
+    updated_vehicle = ops_client.get(f"/api/v1/vehicles/{vehicle['public_ref']}").json()
+    assert updated_vehicle["odometer_km"] == vehicle["odometer_km"]
+    issues = ops_client.get(
+        "/api/v1/data-quality/issues",
+        params={"status": "open", "rule_type": "odometer_regression"},
+    ).json()
+    issue = next(item for item in issues if item["entity_ref"] == vehicle["public_ref"])
+    assert issue["evidence"]["source_type"] == "checkout"
+    assert issue["evidence"]["correctable_booking_refs"] == []
+    detail = ops_client.get(f"/api/v1/data-quality/issues/{issue['public_ref']}").json()
+    assert any(snapshot["entity_type"] == "inspection" for snapshot in detail["related_snapshots"])
+    invalid_correction = ops_client.post(
+        f"/api/v1/data-quality/issues/{issue['public_ref']}/resolve-odometer-regression",
+        json={
+            "decision": "correct_reading",
+            "booking_ref": booking["public_ref"],
+            "corrected_odometer_km": vehicle["odometer_km"],
+        },
+    )
+    assert invalid_correction.status_code == 422
+    retained = ops_client.post(
+        f"/api/v1/data-quality/issues/{issue['public_ref']}/resolve-odometer-regression",
+        json={"decision": "retain_canonical"},
+    )
+    assert retained.status_code == 200
+    assert retained.json()["status"] == "resolved"
+
+
+def test_get_booking_detail(ops_client):
+    response = ops_client.get("/api/v1/bookings/BK-DEMO-RETURN")
+    assert response.status_code == 200
+    body = response.json()
+    assert body["status"] == "active"
+    assert body["vehicle_ref"] == "MO-024"
+
+
+def test_get_booking_404_for_unknown_ref(ops_client):
+    response = ops_client.get("/api/v1/bookings/BK-UNKNOWN")
+    assert response.status_code == 404

backend/tests/test_dashboard.py

@@ -0,0 +1,89 @@
+from sqlalchemy import select
+
+from app.core.db import SessionLocal
+from app.models.vehicle import Vehicle
+
+
+def test_dashboard_metrics_are_persisted_counts(ops_client):
+    response = ops_client.get("/api/v1/dashboard")
+    assert response.status_code == 200
+    body = response.json()
+    metrics = body["metrics"]
+    total = (
+        metrics["available"]
+        + metrics["rented"]
+        + metrics["cleaning"]
+        + metrics["maintenance"]
+        + metrics["blocked"]
+    )
+    assert total == 50
+    assert metrics["open_quality_issues"] >= 1
+    assert metrics["pending_or_failed_workflows"] >= 1
+
+
+def test_dashboard_metrics_change_when_persisted_fleet_data_changes(ops_client):
+    before = ops_client.get("/api/v1/dashboard").json()["metrics"]
+    db = SessionLocal()
+    probe = Vehicle(
+        public_ref="MO-METRIC-PROBE",
+        make="Synthetic",
+        model="Metric probe",
+        model_year=2026,
+        registration_number="TEST-METRIC-PROBE",
+        location="Test fixture",
+        operational_status="blocked",
+        odometer_km=0,
+        next_service_km=1,
+        active=True,
+        version=1,
+    )
+    try:
+        db.add(probe)
+        db.commit()
+
+        after_response = ops_client.get("/api/v1/dashboard")
+        assert after_response.status_code == 200
+        after = after_response.json()["metrics"]
+        assert after["blocked"] == before["blocked"] + 1
+        fleet_statuses = ("available", "rented", "cleaning", "maintenance", "blocked")
+        assert (
+            sum(after[status] for status in fleet_statuses)
+            == sum(before[status] for status in fleet_statuses) + 1
+        )
+    finally:
+        persisted_probe = db.scalar(select(Vehicle).where(Vehicle.public_ref == "MO-METRIC-PROBE"))
+        if persisted_probe is not None:
+            db.delete(persisted_probe)
+            db.commit()
+        db.close()
+
+
+def test_dashboard_attention_items_link_to_records(ops_client):
+    response = ops_client.get("/api/v1/dashboard")
+    body = response.json()
+    assert len(body["attention_items"]) > 0
+    for item in body["attention_items"]:
+        assert item["link_ref"]
+        assert item["severity"] in ("low", "medium", "high")
+
+
+def test_dashboard_attention_items_expose_localizable_signals_not_raw_text(ops_client):
+    """The dashboard subtext used to be raw, untranslated evidence text (and for most
+    seeded issues, the meaningless placeholder 'Synthetic deterministic seed issue').
+    The API must never emit prose here -- only stable signal codes + params, exactly
+    like the data-quality issue detail page, for the frontend to localize."""
+    response = ops_client.get("/api/v1/dashboard")
+    body = response.json()
+    assert len(body["attention_items"]) > 0
+    for item in body["attention_items"]:
+        assert "detail" not in item
+        assert len(item["evidence_signals"]) > 0
+        for signal in item["evidence_signals"]:
+            assert signal["code"]
+            assert signal["code"] != "Synthetic deterministic seed issue"
+
+
+def test_dashboard_recent_automation_capped_at_five(ops_client):
+    response = ops_client.get("/api/v1/dashboard")
+    body = response.json()
+    assert len(body["recent_automation"]) == 5

backend/tests/test_database_constraints.py

@@ -0,0 +1,33 @@
+import pytest
+from sqlalchemy import text
+from sqlalchemy.exc import IntegrityError
+
+from app.core.db import SessionLocal
+
+
+@pytest.mark.parametrize(
+    ("statement", "constraint_name"),
+    (
+        (
+            "UPDATE vehicles SET odometer_km = -1 WHERE public_ref = 'MO-001'",
+            "ck_vehicles_odometer",
+        ),
+        (
+            "UPDATE bookings SET ends_at = starts_at WHERE public_ref = 'BK-DEMO-RETURN'",
+            "ck_bookings_time_window",
+        ),
+        (
+            "UPDATE data_quality_issues SET status = 'invented' "
+            "WHERE public_ref = 'DQ-DEMO-DUPLICATE'",
+            "ck_data_quality_status",
+        ),
+        ("UPDATE outbox_events SET attempts = -1", "ck_outbox_attempts"),
+    ),
+)
+def test_database_rejects_invalid_domain_state(statement: str, constraint_name: str) -> None:
+    with SessionLocal() as db:
+        with pytest.raises(IntegrityError) as caught:
+            db.execute(text(statement))
+            db.commit()
+        db.rollback()
+    assert constraint_name in str(caught.value)