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
• Parallel Change as the safe expand, migrate, contract workflow for breaking or data-sensitive schema changes
• 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.