notification_history.review_cycle_id unique constraint 추가 (#86)

* chore: NotificationHistory review_cycle_id에 유니크 제약 조건 추가

* refactor: NotificationHistory 유니크 제약 조건명 명시

* style: NotificationHistory 테이블 설정 개행 정리

Author: jhan0121

src/main/java/com/recyclestudy/review/domain/NotificationHistory.java

@@ -10,6 +10,7 @@
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToOne;
 import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
 import java.time.LocalDateTime;
 import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
@@ -18,7 +19,13 @@
 import lombok.experimental.FieldNameConstants;
 
 @Entity
-@Table(name = "notification_history")
+@Table(
+        name = "notification_history",
+        uniqueConstraints = @UniqueConstraint(
+                name = "uk_notification_history_review_cycle_id",
+                columnNames = "review_cycle_id"
+        )
+)
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 @AllArgsConstructor(access = AccessLevel.PRIVATE)
 @FieldNameConstants(level = AccessLevel.PRIVATE)

src/main/resources/db/migration/V20260307_2__add_unique_constraint_to_notification_history.sql

@@ -0,0 +1,2 @@
+ALTER TABLE notification_history
+    ADD CONSTRAINT uk_notification_history_review_cycle_id UNIQUE (review_cycle_id);