repository-expert

Repository 전문가. JpaRepository(Command: save/delete), QueryDslRepository(Query: 4개 메서드), AdminQueryDslRepository(Join 허용, DTO Projection), LockRepository(Pessimistic Lock). Entity 직접 반환 금지, N+1은 Application Layer에서 해결. JPQL 금지, Lazy Loading 의존 금지.