Backend Migrations

Create and manage database schema migrations with reversible changes and zero-downtime deployment support. Use this skill when creating, modifying, or reviewing database migration files such as Alembic migrations, Django migrations, Flyway scripts, or Liquibase changesets. Use when writing migration scripts that alter table schemas, add or remove columns, create or drop indexes, modify constraints, or perform data transformations. Use when working with migration files in directories like alembic/versions/, migrations/, db/migrate/, or similar database version control folders. Use when implementing schema changes that need to be backward compatible or when separating schema changes from data migrations.