Drizzle Safe Migrations

Overview

Use this skill to run database migrations in a way that is auditable, deployment-safe, and consistent with Drizzle's migration model.

Core Rules

• Generate schema migrations with the existing project script and package manager; bun run db:generate below is an example, not a required script name.
• Never hand-edit generated schema migration files.
• Generate data backfills as custom migrations (bun run db:generate -- --custom --name <name>) and edit only that custom SQL file.
• Apply data normalization before tightening constraints.
• Keep one-off data fixes in migration history, not as hidden runtime logic, unless an emergency hotfix requires temporary mitigation.

Workflow