fix : notification FK 회원 삭제 오류 수정 (#514)

* fix : notification/notification_subscribe DELETE CASCADE로 변경

* chore : Front 요청으로 인한 회원가입 에러코드 409 추가

* chore : DB 생략

src/main/java/in/koreatech/koin/domain/user/controller/UserApi.java

@@ -136,6 +136,7 @@ ResponseEntity<UserTokenRefreshResponse> refresh(
             @ApiResponse(responseCode = "401", content = @Content(schema = @Schema(hidden = true))),
             @ApiResponse(responseCode = "403", content = @Content(schema = @Schema(hidden = true))),
             @ApiResponse(responseCode = "404", content = @Content(schema = @Schema(hidden = true))),
+            @ApiResponse(responseCode = "409", content = @Content(schema = @Schema(hidden = true)))
         }
     )
     @Operation(summary = "회원가입")

src/main/resources/db/migration/V15__delete_notification_subscribe.sql

@@ -0,0 +1,16 @@
+ALTER TABLE `notification_subscribe`
+DROP FOREIGN KEY `FK_NOTIFICATION_SUBSCRIBE_ON_USER`;
+ALTER TABLE `notification_subscribe`
+    ADD CONSTRAINT `FK_NOTIFICATION_SUBSCRIBE_ON_USER`
+        FOREIGN KEY (`user_id`)
+            REFERENCES `koin`.`users` (`id`)
+            ON DELETE CASCADE
+            ON UPDATE RESTRICT;
+
+ALTER TABLE `notification`
+DROP FOREIGN KEY `FK_NOTIFICATION_ON_USER FOREIGN KEY`;
+ALTER TABLE `notification`
+    ADD CONSTRAINT `FK_NOTIFICATION_ON_USER FOREIGN KEY`
+        FOREIGN KEY (`users_id`)
+            REFERENCES `koin`.`users` (`id`)
+            ON DELETE CASCADE;