[refactor] 좋아요 API 성능 최적화 및 유저 식별 방식 변경

src/main/java/org/sopt/pawkey/backendapi/domain/Post/api/controller/PostLikeController.java

@@ -13,9 +13,9 @@
 import org.springframework.web.bind.annotation.RestController;
 
 import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.media.Content;
 import io.swagger.v3.oas.annotations.responses.ApiResponses;
-import jakarta.validation.constraints.NotNull;
 import lombok.RequiredArgsConstructor;
 
 @RestController
@@ -35,9 +35,9 @@ public class PostLikeController {
 	@PostMapping("/{postId}")
 	public ResponseEntity<ApiResponse<Void>> like(
 		@PathVariable Long postId,
-		@NotNull @UserId Long userId
+		@Parameter(hidden = true) @UserId Long userId
 	) {
-		postLikeFacade.like(postId, userId.longValue());
+		postLikeFacade.like(postId, userId);
 		return ResponseEntity.ok(ApiResponse.success(null));
 	}
 
@@ -52,9 +52,9 @@ public ResponseEntity<ApiResponse<Void>> like(
 	@DeleteMapping("/{postId}")
 	public ResponseEntity<ApiResponse<Void>> cancelLike(
 		@PathVariable Long postId,
-		@NotNull @UserId Long userId) {
+		@Parameter(hidden = true) @UserId Long userId) {
 
-		postLikeFacade.cancelLike(postId, userId.longValue());
+		postLikeFacade.cancelLike(postId, userId);
 		return ResponseEntity.ok(ApiResponse.success(null));
 	}
 }

src/main/java/org/sopt/pawkey/backendapi/domain/Post/application/service/PostLikeService.java

@@ -32,11 +32,11 @@ public void like(final UserEntity user, final PostEntity post) {
 	public void cancelLike(UserEntity user, PostEntity post) {
 		validateNotSelfLike(user, post);
 
-		if (!postLikeRepository.existsByUserIdAndPostId(user.getUserId(), post.getPostId())) {
+		long deletedCount = postLikeRepository.deleteByUserIdAndPostId(user.getUserId(), post.getPostId());
+
+		if (deletedCount == 0) {
 			throw new PostLikeBusinessException(PostLikeErrorCode.LIKE_NOT_FOUND);
 		}
-
-		postLikeRepository.deleteByUserIdAndPostId(user.getUserId(), post.getPostId());
 	}
 
 	private void validateNotSelfLike(UserEntity user, PostEntity post) {

src/main/java/org/sopt/pawkey/backendapi/domain/Post/domain/repository/PostLikeRepository.java

@@ -12,5 +12,5 @@ public interface PostLikeRepository {
 
 	List<PostLikeEntity> findAllByUserWithPostAndImages(Long userId);
 
-	void deleteByUserIdAndPostId(Long userId, Long postId);
+	int deleteByUserIdAndPostId(Long userId, Long postId);
 }

src/main/java/org/sopt/pawkey/backendapi/domain/Post/infra/persistence/repository/PostLikeRepositoryImpl.java

@@ -27,8 +27,8 @@ public boolean existsByUserIdAndPostId(Long userId, Long postId) {
 	}
 
 	@Override
-	public void deleteByUserIdAndPostId(Long userId, Long postId) {
-		jpaRepository.deleteByUserIdAndPostIdQuery(userId, postId);
+	public int deleteByUserIdAndPostId(Long userId, Long postId) {
+		return jpaRepository.deleteByUserIdAndPostIdQuery(userId, postId);
 	}
 
 	@Override

src/main/java/org/sopt/pawkey/backendapi/domain/Post/infra/persistence/repository/SpringDataPostLikeRepository.java

@@ -29,5 +29,5 @@ public interface SpringDataPostLikeRepository extends JpaRepository<PostLikeEnti
 
 	@Modifying
 	@Query("DELETE FROM PostLikeEntity pl WHERE pl.user.userId = :userId AND pl.post.postId = :postId")
-	void deleteByUserIdAndPostIdQuery(@Param("userId") Long userId, @Param("postId") Long postId);
+	int deleteByUserIdAndPostIdQuery(@Param("userId") Long userId, @Param("postId") Long postId);
 }