diff --git a/backend/src/main/resources/db/migration/V6__add_unique_constraints_like_and_understanding_response.sql b/backend/src/main/resources/db/migration/V6__add_unique_constraints_like_and_understanding_response.sql
new file mode 100644
index 0000000..6d711d8
--- /dev/null
+++ b/backend/src/main/resources/db/migration/V6__add_unique_constraints_like_and_understanding_response.sql
@@ -0,0 +1,9 @@
+-- QuestionLike: 같은 유저가 같은 질문에 좋아요를 중복으로 누르는 것을 DB 레벨에서 차단
+ALTER TABLE question_like
+    ADD CONSTRAINT uq_question_like_question_user
+    UNIQUE (question_id, user_id);
+
+-- UnderstandingResponse: 같은 유저가 같은 이해도 체크에 중복 응답하는 것을 DB 레벨에서 차단
+ALTER TABLE understanding_response
+    ADD CONSTRAINT uq_understanding_response_check_user
+    UNIQUE (check_id, user_id);
\ No newline at end of file