JPA 엔티티 설계

@Entity
@Table(name = "users")
@Getter
@NoArgsConstructor(access = AccessLevel.PROTECTED) // JPA 필수
@AllArgsConstructor
@Builder
public class User extends BaseEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false, unique = true, length = 100)
    private String email;

    @Column(nullable = false)
    private String password;

    @Column(nullable = false, length = 50)
    private String name;

    @Enumerated(EnumType.STRING) // "ACTIVE" 문자열 저장
    private UserStatus status = UserStatus.ACTIVE;

    // 1:N 관계 — FetchType.LAZY 필수
    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL,
               fetch = FetchType.LAZY)
    private List<Post> posts = new ArrayList<>();
}

// Post 엔티티
@Entity
public class Post {
    @ManyToOne(fetch = FetchType.LAZY) // N+1 방지
    @JoinColumn(name = "user_id")
    private User user;
}

// BaseEntity (공통 컬럼)
@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
public abstract class BaseEntity {
    @CreatedDate
    private LocalDateTime createdAt;
    @LastModifiedDate
    private LocalDateTime updatedAt;
}