512-frameworks-micronaut-data

# Micronaut Data Guidelines Apply Micronaut Data patterns for relational repositories and safe SQL. **What is covered in this Skill?** - @MappedEntity, @Id, @GeneratedValue, @MappedProperty for column mapping - @Repository interfaces extending CrudRepository / PageableRepository - Derived finder methods and @Query with named parameters - @Transactional on @Singleton services (readOnly where appropriate) - Page and Pageable for list endpoints - DTO/interface projections for read-heavy queries - @Version for optimistic locking - Integration tests: @MicronautTest + TestPropertyProvider + Testcontainers **Scope:** Apply recommendations based on the reference rules and good/bad code examples. ## Constraints Compile before persistence changes; verify the full build after. - **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 examples ## When to use this skill - Review or implement Micronaut Data repositories and entities - Add transactions, pagination, or projections in Micronaut persistence layer ## Reference For detailed guidance, examples, and constraints, see [references/512-frameworks-micronaut-data.md](references/512-frameworks-micronaut-data.md).