313-frameworks-spring-db-migrations-flyway

# Spring — Database migrations (Flyway) Apply Flyway migration guidelines for Spring Boot. **What is covered in this Skill?** - flyway-core and database-specific Flyway modules (e.g. PostgreSQL) with Spring Boot BOM - Versioned SQL under `src/main/resources/db/migration` (`V{version}__{description}.sql`) - `spring.flyway.*` properties: locations, baseline-on-migrate, validate-on-migrate - Optional Java migrations (`BaseJavaMigration`) for data backfills - Forward-only discipline: do not rewrite applied migrations in shared environments - Coordination with `@311-frameworks-spring-jdbc` and `@312-frameworks-spring-data-jdbc` **Scope:** Apply recommendations based on the reference rules and good/bad examples. ## Constraints Before applying Flyway or SQL changes, ensure the project compiles. After improvements, run full verification. - **MANDATORY**: Run `./mvnw compile` or `mvn compile` before applying any change - **SAFETY**: If compilation fails, stop immediately - **VERIFY**: Run `./mvnw clean verify` or `mvn clean verify` after applying improvements - **BEFORE APPLYING**: Read the reference for detailed rules and good/bad patterns ## When to use this skill - Add or review Flyway migrations in a Spring Boot project - Configure spring.flyway or db/migration layout ## Reference For detailed guidance, examples, and constraints, see [references/313-frameworks-spring-db-migrations-flyway.md](references/313-frameworks-spring-db-migrations-flyway.md).