migrations

name: migrations description: Generate, review, edit, apply, or resolve conflicts for Drizzle database migrations in this repo. Use when changing packages/db/src/schema.ts, running pnpm migrations or pnpm migrate, touching packages/db/migrations, reviewing migration diffs, or handling migration merge conflicts.

Migrations

Use this workflow for database schema changes and migration conflicts.

Generate migrations

• Run all commands from the repository root.
• Make schema changes in packages/db/src/schema.ts.
• Generate Drizzle migration artifacts with pnpm migrations.
• Review the generated diff under packages/db/migrations/.
• Drizzle may generate:
  • packages/db/migrations/<timestamp>_<name>.sql
  • packages/db/migrations/meta/<timestamp>_snapshot.json
  • packages/db/migrations/meta/_journal.json

Editing generated migrations

• Do not write a migration by hand from scratch. Generate it first with pnpm migrations.
• If the generated migration needs adaptation, edit only the generated .sql file.
• Never manually edit any *_snapshot.json file.
• Never manually edit packages/db/migrations/meta/_journal.json.
• If the TypeScript schema is wrong, fix packages/db/src/schema.ts and regenerate instead of patching snapshot or journal metadata.
• Use snake_case column names in SQL because Drizzle maps camelCase TypeScript fields to snake_case database columns.

Appropriate .sql-only edits include adding safe data backfills, adjusting a generated type cast, adding a USING clause, splitting statements for safer execution, or preserving data during a rename. Keep the generated snapshot and journal exactly as Drizzle wrote them.

Conflict resolution

Never resolve merge conflicts in migration SQL, snapshot JSON, or journal files manually.

When merging with main and migration conflicts appear:

1. Reset migrations to origin/main:

git restore --source=origin/main packages/db/migrations/

2. Re-run generation from the repository root:

pnpm migrations

3. Review the regenerated SQL. If needed, adapt only the generated .sql file.

Validation

• Inspect git diff packages/db/src/schema.ts packages/db/migrations/.
• Confirm any snapshot JSON and journal changes came from pnpm migrations, not manual edits.
• Run pnpm format after changes.
• Run pnpm build after schema or migration changes.