schema

GraphQL provides flexible APIs where clients specify exact data requirements. Spring for GraphQL integrates GraphQL Java with Spring Boot. Schema-first approach defines types in .graphqls files. Resolvers map schema fields to Java methods using @Query

Migrations version control database schema changes, making them trackable and reversible. Each migration file contains up() and down() methods defining changes and rollbacks. I use the Schema builder's fluent API to create tables, add columns, define

Rails migrations evolve database schema over time. I use change method for reversible migrations. Migrations create tables, add/remove columns, add indices. up and down methods provide explicit control. Irreversible migrations like data transformation

Flyway manages database schema evolution through versioned SQL scripts. Migration files follow naming convention—V1__initial_schema.sql, V2__add_users_table.sql. Flyway tracks applied migrations in a schema history table. Migrations run automatically

Rails enums are nice, but the DB should enforce allowed values. Use a CHECK constraint (or native enum type) plus the Rails enum mapping. It prevents bad writes from console scripts and future migrations.