feat(recommend): 추천 크리에이터 동시 팔로우 서비스를 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/member/following/CreatorFollowing.kt

@@ -6,9 +6,19 @@ import javax.persistence.Entity
 import javax.persistence.FetchType
 import javax.persistence.JoinColumn
 import javax.persistence.ManyToOne
+import javax.persistence.Table
+import javax.persistence.UniqueConstraint
 
 @Entity
-data class CreatorFollowing(
+@Table(
+    uniqueConstraints = [
+        UniqueConstraint(
+            name = "uk_creator_following_member_creator",
+            columnNames = ["member_id", "creator_id"]
+        )
+    ]
+)
+class CreatorFollowing(
     var isNotify: Boolean = true,
     var isActive: Boolean = true
 ) : BaseEntity() {