Backend Migrations

@grimmolf/mga-soap-calculator-backend-migrations

Create and manage database schema changes through versioned migration files with proper rollback support, zero-downtime deployment considerations, and backwards compatibility. Use this skill when creating migration files, modifying database schemas, adding/removing tables or columns, creating indexes, or working in migration directories. Applies to files like migrations/, alembic/, db/migrate/, schema changes, or any database evolution task requiring versioned, reversible changes that maintain data integrity during deployments.