Backend Migrations

Create and manage database schema migrations following best practices for versioning, reversibility, and zero-downtime deployments. Use this skill when creating or modifying database migration files, Alembic migrations, Django migrations, Rails migrations, or any schema change scripts. Use this skill when working with database schema evolution, implementing rollback strategies, managing indexes on large tables, or separating schema changes from data migrations. Use this skill when working with files in migrations/, db/migrate/, alembic/versions/, or similar migration directories. Use this skill when creating new tables, modifying columns, adding indexes, establishing foreign key relationships, or managing database versioning in development and production environments.