100 lines
4.4 KiB
Python
100 lines
4.4 KiB
Python
"""Add durable, single-route operational alert notification outbox."""
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import sqlalchemy as sa
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from alembic import op
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revision = "20260923_0037"
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down_revision = "20260923_0036"
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branch_labels = None
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depends_on = None
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def upgrade() -> None:
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op.create_table(
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"alert_notification_deliveries",
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sa.Column("id", sa.Uuid(), nullable=False),
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sa.Column("alert_history_event_id", sa.Uuid(), nullable=True),
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sa.Column("route_key", sa.String(length=64), nullable=False),
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sa.Column("idempotency_key", sa.String(length=160), nullable=False),
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sa.Column("event_kind", sa.String(length=16), nullable=False),
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sa.Column("severity", sa.String(length=16), nullable=True),
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sa.Column("payload", sa.JSON(), nullable=False),
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sa.Column("status", sa.String(length=24), nullable=False),
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sa.Column("attempt_count", sa.Integer(), nullable=False),
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sa.Column("next_attempt_at", sa.DateTime(timezone=True), nullable=True),
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sa.Column("last_attempt_at", sa.DateTime(timezone=True), nullable=True),
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sa.Column("delivered_at", sa.DateTime(timezone=True), nullable=True),
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sa.Column("lease_expires_at", sa.DateTime(timezone=True), nullable=True),
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sa.Column("claim_token_hash", sa.String(length=64), nullable=True),
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sa.Column("last_http_status", sa.Integer(), nullable=True),
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sa.Column("last_error_code", sa.String(length=64), nullable=True),
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sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
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sa.CheckConstraint(
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"event_kind IN ('FIRING', 'RESOLVED', 'TEST')",
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name="ck_alert_notification_event_kind",
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),
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sa.CheckConstraint(
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"status IN ('PENDING', 'DISPATCHING', 'RETRY_WAIT', 'DELIVERED', 'FAILED', 'HELD_FOR_REVIEW')",
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name="ck_alert_notification_status",
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),
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sa.CheckConstraint("attempt_count >= 0", name="ck_alert_notification_attempt_count"),
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sa.ForeignKeyConstraint(
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["alert_history_event_id"], ["alert_history_events.id"], ondelete="RESTRICT"
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),
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sa.PrimaryKeyConstraint("id"),
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sa.UniqueConstraint("idempotency_key", name="uq_alert_notification_idempotency"),
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)
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op.create_index(
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"ix_alert_notification_deliveries_alert_history_event_id",
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"alert_notification_deliveries",
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["alert_history_event_id"],
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)
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op.create_index(
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"ix_alert_notification_deliveries_event_kind",
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"alert_notification_deliveries",
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["event_kind"],
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)
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op.create_index(
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"ix_alert_notification_deliveries_severity",
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"alert_notification_deliveries",
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["severity"],
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)
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op.create_index(
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"ix_alert_notification_deliveries_status",
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"alert_notification_deliveries",
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["status"],
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)
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op.create_index(
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"ix_alert_notification_deliveries_next_attempt_at",
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"alert_notification_deliveries",
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["next_attempt_at"],
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)
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op.create_index(
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"ix_alert_notification_deliveries_lease_expires_at",
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"alert_notification_deliveries",
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["lease_expires_at"],
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)
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op.create_index(
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"ix_alert_notification_dispatch_due",
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"alert_notification_deliveries",
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["status", "next_attempt_at", "created_at"],
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)
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def downgrade() -> None:
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bind = op.get_bind()
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deliveries = sa.table("alert_notification_deliveries", sa.column("id"))
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if bind.scalar(sa.select(sa.func.count()).select_from(deliveries)):
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raise RuntimeError(
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"alert notification history exists; restore the pre-migration backup instead."
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)
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op.drop_index("ix_alert_notification_dispatch_due", table_name="alert_notification_deliveries")
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op.drop_index("ix_alert_notification_deliveries_lease_expires_at", table_name="alert_notification_deliveries")
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op.drop_index("ix_alert_notification_deliveries_next_attempt_at", table_name="alert_notification_deliveries")
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op.drop_index("ix_alert_notification_deliveries_status", table_name="alert_notification_deliveries")
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op.drop_index("ix_alert_notification_deliveries_severity", table_name="alert_notification_deliveries")
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op.drop_index("ix_alert_notification_deliveries_event_kind", table_name="alert_notification_deliveries")
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op.drop_index("ix_alert_notification_deliveries_alert_history_event_id", table_name="alert_notification_deliveries")
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op.drop_table("alert_notification_deliveries")
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