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
• 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.

• 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
• BREAKING CHANGE REVIEW: Before recommending or applying a migration, assess whether it can break deployed application versions, dependent services, reports, jobs, or production data interpretation; if yes, require explicit human review before proceeding
• EDGE CASE: If the user goal is ambiguous, stop and ask a clarifying question before editing files or running project-wide commands
• EDGE CASE: If required context, files, credentials, or tools are missing, report the blocker explicitly and ask whether to proceed with setup or fallback guidance
• EDGE CASE: If requested changes conflict with project constraints or safety boundaries, explain the conflict and ask for user confirmation on the preferred trade-off

When to use this skill

• Add or review Flyway migrations in a Spring Boot project
• Configure spring.flyway or db/migration layout
• Add versioned Flyway SQL migrations for Spring Boot
• Review Spring Boot database migration ordering
• Fix repeatable Flyway migrations in a Spring project

Workflow

• Read references and assess project context

Read references/313-frameworks-spring-db-migrations-flyway.md, references/313-frameworks-spring-db-migrations-flyway-antipatterns.md, and references/313-frameworks-spring-db-migrations-flyway-parallel-change.md, then inspect the current project setup before proposing changes.

• Gather scope and decide target improvements

Identify requested outcomes, constraints, and the minimum safe set of changes to apply.

• Apply framework-aligned changes

Implement or refactor configuration/code following the reference patterns and project conventions. Use Parallel Change (expand, migrate, contract) as the safe default for breaking or data-sensitive schema changes.

• Run verification and report results

Execute appropriate build/tests and summarize what changed, what was verified, and any follow-up actions.

Reference

For detailed guidance, examples, and constraints, see:

• references/313-frameworks-spring-db-migrations-flyway.md
• references/313-frameworks-spring-db-migrations-flyway-antipatterns.md
• references/313-frameworks-spring-db-migrations-flyway-parallel-change.md