hotfix: fk 설정 에러 - 마이그레이션 파일 수정

Author: LeeMinwoo115

backend/src/main/resources/db/migration/V20251231_03__add_store_relation_and_backfill_events_and_admin_users.sql

@@ -5,7 +5,7 @@ ALTER TABLE events
     ADD COLUMN IF NOT EXISTS store_id BIGINT;
 
 /* ============================================================
- * 2. Legacy Store 생성 (없으면 생성, 있으면 재사용)
+ * 2~4. Legacy Store 생성 + backfill (events/users)
  * ============================================================ */
 DO
 $$
@@ -36,18 +36,12 @@ $$
             RETURNING id INTO v_store_id;
         END IF;
 
-        /* ========================================================
-         * 3. 기존 이벤트 → Legacy Store로 backfill
-         * ======================================================== */
+        /* 3. 기존 이벤트 → Legacy Store로 backfill */
         UPDATE events
         SET store_id = v_store_id
         WHERE store_id IS NULL;
 
-        /* ========================================================
-         * 4. 기존 ADMIN 사용자 → Legacy Store로 backfill
-         *    - store_id가 NULL인 경우만
-         *    - deleted_at IS NULL (소프트 삭제 제외)
-         * ======================================================== */
+        /* 4. 기존 ADMIN 사용자 → Legacy Store로 backfill */
         UPDATE users
         SET store_id = v_store_id
         WHERE role = 'ADMIN'
@@ -58,20 +52,36 @@ $$;
 
 /* ============================================================
  * 5. events.store_id NOT NULL 강제
+ *    - 이미 3번에서 NULL backfill 했으므로 안전
  * ============================================================ */
 ALTER TABLE events
     ALTER COLUMN store_id SET NOT NULL;
 
 /* ============================================================
- * 6. FK 제약 추가
+ * 6. FK 제약 추가 (이미 존재하면 스킵)
  * ============================================================ */
-ALTER TABLE events
-    ADD CONSTRAINT fk_events_store
-        FOREIGN KEY (store_id) REFERENCES stores (id);
+DO
+$$
+    BEGIN
+        -- events FK
+        IF NOT EXISTS (SELECT 1
+                       FROM pg_constraint
+                       WHERE conname = 'fk_events_store') THEN
+            ALTER TABLE events
+                ADD CONSTRAINT fk_events_store
+                    FOREIGN KEY (store_id) REFERENCES stores (id);
+        END IF;
 
-ALTER TABLE users
-    ADD CONSTRAINT fk_user_store
-        FOREIGN KEY (store_id) REFERENCES stores (id);
+        -- users FK
+        IF NOT EXISTS (SELECT 1
+                       FROM pg_constraint
+                       WHERE conname = 'fk_user_store') THEN
+            ALTER TABLE users
+                ADD CONSTRAINT fk_user_store
+                    FOREIGN KEY (store_id) REFERENCES stores (id);
+        END IF;
+    END
+$$;
 
 /* ============================================================
  * 7. 인덱스 (조회/조인 성능)
@@ -80,4 +90,4 @@ CREATE INDEX IF NOT EXISTS idx_events_store_id
     ON events (store_id);
 
 CREATE INDEX IF NOT EXISTS idx_users_store_id
-    ON users (store_id);
+    ON users (store_id);