Database Migrations

This covers the full lifecycle of database schema changes: safe column additions, concurrent index creation, zero-downtime renames using expand-contract, and batched data migrations that won't lock your tables. It includes patterns for PostgreSQL, MySQL, and five ORMs (Prisma, Drizzle, Kysely, Django, TypeORM, golang-migrate) with real migration file examples. The safety checklist alone is worth having open when you're about to add a NOT NULL column to a 50 million row table at 2pm on a Tuesday. Best for teams that have been bitten by a full table rewrite in production and want the playbook to never let it happen again.

Install to Claude Code

npx -y skills add affaan-m/everything-claude-code --skill database-migrations --agent claude-code