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database-migrations

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Database migration best practices for schema changes, data migrations, rollbacks, and zero-downtime deployments across PostgreSQL, MySQL, and common ORMs (Prisma, Drizzle, Kysely, Django, TypeORM, golang-migrate).

auc/skill_library/bundled/database-migrations/SKILL.md

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# Database Migration Patterns

Safe, reversible database schema changes for production systems.

## When to Activate

- Creating or altering database tables
- Adding/removing columns or indexes
- Running data migrations (backfill, transform)
- Planning zero-downtime schema changes
- Setting up migration tooling for a new project

## Core Principles

1. **Every change is a migration** — never alter production databases manually
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