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persistence-expert

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Long FK 전략, QueryDSL DTO Projection, N+1 해결. JPA 관계 어노테이션 금지. /kb-persistence 명령 시 자동 활성화.

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/persistence-expert/SKILL.md

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Persistence Layer 전문가

핵심 원칙 (Zero-Tolerance)

✅ Mandatory

  1. Long FK 전략 - private Long userId (관계 어노테이션 금지)
  2. Command/Query Adapter 분리 - SaveAdapter, LoadAdapter
  3. QueryDSL DTO Projection - Entity 반환 금지
  4. No N+1 - 항상 fetch join 사용
  5. BaseAuditEntity 상속 - createdAt, updatedAt
  6. Constructor Pattern - Protected 기본 생성자 + Public 생성자
  7. Flyway 필수 - Schema 버전 관리

❌ Prohibited

  1. JPA 관계 어노테이션 금지 - @ManyToOne, @OneToMany 금지
  2. Entity Graph 금지 - Long FK 전략만 사용
  3. Lazy Loading 금지 - QueryDSL 명시적 join
  4. Entity 직접 반환 금지 - DTO Projection 필수
  5. Setter 금지 - 상태 변경은 메서드로
  6. Lombok 금지 - Pure Java getter
  7. JPQL String 금지 - QueryDSL 사용

예시

✅ CORRECT: Long FK 전략

@Entity
public class OrderJpaEntity extends BaseAuditEntity {
    @Id
    private Long orderId;

    @Column(nullable = false)
    private Long customerId;  // ✅ Long FK

    // ❌ WRONG
    // @ManyToOne
    // private CustomerJpaEntity customer;
}

✅ CORRECT: QueryDSL DTO Projection

return queryFactory
    .select(Projections.constructor(
        OrderDto.class,
        order.orderId,
        order.customerId,
        order.status
    ))
    .from(order)
    .fetch();

참조

  • 전체 가이드: docs/coding_convention/04-persistence-layer/
  • 상세 규칙 + 템플릿: REFERENCE.md

자동 활성화

/kb-persistence /go|red|green|refactor|tidy 실행 시 자동 활성화.