database-migrations

Safe schema migrations for PostgreSQL - versioned forward-only migrations, one change per migration, expand/contract for zero-downtime deploys, batched backfills, lock awareness (concurrent index creation, NOT NULL and default adds), reversible vs roll-forward policy, testing on production-sized data, ordering and conflicts in teams, seed vs migration data, never editing applied migrations, and Prisma migrate workflow notes. Load when changing a schema, writing a migration, planning a backfill, adding indexes or constraints to live tables, or resolving migration conflicts.