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name: db-alembic-ops description: Database + Alembic workflow for Slack-MM2 Sync (migrations, collapsed history, NEVER CANCEL guidance, and troubleshooting queries). Use when changing schema, debugging DB state, or dealing with migration failures. license: Complete terms in LICENSE.txt compatibility: Requires Postgres access; Docker Compose recommended for dev.

Database & Alembic Operations

When to use

• Running or debugging Alembic migrations
• Inspecting entities, entity_relations, import_jobs state
• Updating schema or indexes
• Investigating migration/startup failures

Migrations

Canonical command (repo root):

• alembic -c alembic.ini upgrade head

Important:

• Migrations are also applied automatically when backend starts (lifespan hook). If backend appears “stuck”, it may be running migrations.
• NEVER CANCEL a migration command once started.

Collapsed migration history

This repo uses a collapsed history model. For clean DBs, upgrade head is the expected flow. If you’re dealing with a historical DB/schema mismatch, follow the guidance in backend/README.md / docs/dev.md rather than guessing.

Common troubleshooting

• View backend logs (migration errors surface there):

  • docker compose -f infra/docker-compose.dev.yml logs -f backend

• Inspect DB quickly:

  • docker compose -f infra/docker-compose.dev.yml exec db \ psql -U slack-mm -d slack-mm -P pager=off -c "select * from import_jobs order by id desc limit 5;"

• Inspect entities:

  • docker compose -f infra/docker-compose.dev.yml exec db \ psql -U slack-mm -d slack-mm -P pager=off -c "select id, entity_type, status from entities order by id desc limit 20;"

Related docs

• Migrations + DB policy: docs/dev.md
• Schema notes: backend/README.md
• Infra DB notes: infra/README.md
• DB init/troubleshooting notes: infra/db/README.md