fix: BaseEntity 관련 마이그레이션 파일 수정 (#530)

* refactor: Mentoring 엔티티가 BaseEntity를 상속함에 따라 createAt 필드 제거

* chore: BaseEntity 관련 롤백 DDL 작성

* test: mentoring 픽스처 생성 시 createdAt 생성하지 않도록

Author: whqtker

src/main/java/com/example/solidconnection/mentor/domain/Mentoring.java

@@ -13,7 +13,6 @@
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
-import jakarta.persistence.PrePersist;
 import java.time.ZonedDateTime;
 import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
@@ -34,9 +33,6 @@ public class Mentoring extends BaseEntity {
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    @Column(nullable = false)
-    private ZonedDateTime createdAt;
-
     @Column
     private ZonedDateTime confirmedAt;
 
@@ -62,11 +58,6 @@ public Mentoring(long mentorId, long menteeId, VerifyStatus verifyStatus) {
         this.verifyStatus = verifyStatus;
     }
 
-    @PrePersist
-    public void onPrePersist() {
-        this.createdAt = ZonedDateTime.now(UTC).truncatedTo(MICROS); // 나노초 6자리 까지만 저장
-    }
-
     public void confirm(VerifyStatus status) {
         this.verifyStatus = status;
         this.confirmedAt = ZonedDateTime.now(UTC).truncatedTo(MICROS);

src/main/resources/db/migration/V34__add_baseentity_related_fields.sql

@@ -2,14 +2,6 @@ ALTER TABLE application
     ADD COLUMN created_at DATETIME(6),
     ADD COLUMN updated_at DATETIME(6);
 
-ALTER TABLE gpa
-    ADD COLUMN created_at DATETIME(6),
-    ADD COLUMN updated_at DATETIME(6);
-
-ALTER TABLE language_test
-    ADD COLUMN created_at DATETIME(6),
-    ADD COLUMN updated_at DATETIME(6);
-
 ALTER TABLE post_image
     ADD COLUMN created_at DATETIME(6),
     ADD COLUMN updated_at DATETIME(6);
@@ -35,7 +27,6 @@ ALTER TABLE mentor
     ADD COLUMN updated_at DATETIME(6);
 
 ALTER TABLE mentoring
-    ADD COLUMN created_at DATETIME(6),
     ADD COLUMN updated_at DATETIME(6);
 
 ALTER TABLE liked_news

src/test/java/com/example/solidconnection/mentor/fixture/MentoringFixtureBuilder.java

@@ -25,11 +25,6 @@ public MentoringFixtureBuilder mentoring() {
         return new MentoringFixtureBuilder(mentoringRepository);
     }
 
-    public MentoringFixtureBuilder createdAt(ZonedDateTime createdAt) {
-        this.createdAt = createdAt;
-        return this;
-    }
-
     public MentoringFixtureBuilder confirmedAt(ZonedDateTime confirmedAt) {
         this.confirmedAt = confirmedAt;
         return this;
@@ -63,7 +58,6 @@ public MentoringFixtureBuilder menteeId(long menteeId) {
     public Mentoring create() {
         Mentoring mentoring = new Mentoring(
                 null,
-                createdAt,
                 confirmedAt,
                 checkedAtByMentor,
                 checkedAtByMentee,