chore: 필요 없는 코드 제거

Author: leegwichan

src/main/java/com/debatetimer/entity/BaseTimeEntity.java

@@ -2,7 +2,6 @@
 
 import jakarta.persistence.EntityListeners;
 import jakarta.persistence.MappedSuperclass;
-import jakarta.persistence.PrePersist;
 import jakarta.validation.constraints.NotNull;
 import java.time.LocalDateTime;
 import lombok.Getter;
@@ -22,14 +21,4 @@ public abstract class BaseTimeEntity {
     @NotNull
     @LastModifiedDate
     private LocalDateTime modifiedAt;
-
-    @PrePersist
-    public void prePersist() {
-        if (createdAt == null) {
-            createdAt = LocalDateTime.now();
-        }
-        if (modifiedAt == null) {
-            modifiedAt = LocalDateTime.now();
-        }
-    }
 }