♻️ refactor: transactional 메서드별 관리로 수정

src/main/java/com/nextcloudlab/kickytime/match/service/MatchParticipantService.java

@@ -13,11 +13,11 @@
 
 @Service
 @RequiredArgsConstructor
-@Transactional(readOnly = true)
 public class MatchParticipantService {
 
     private final MatchParticipantRepository matchParticipantRepository;
 
+    @Transactional(readOnly = true)
     public MyMatchesResponse getMyParticipant(String cognitoSub) {
 
         List<MyMatchesResponse.MatchInfo> matches =

src/main/java/com/nextcloudlab/kickytime/match/service/MatchService.java

@@ -6,6 +6,7 @@
 import java.util.stream.Collectors;
 
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import com.nextcloudlab.kickytime.match.dto.MatchCreateRequestDto;
 import com.nextcloudlab.kickytime.match.dto.MatchResponseDto;
@@ -18,10 +19,7 @@
 import com.nextcloudlab.kickytime.user.entity.User;
 import com.nextcloudlab.kickytime.user.repository.UserRepository;
 
-import jakarta.transaction.Transactional;
-
 @Service
-@Transactional
 public class MatchService {
 
     private final MatchRepository matchRepository;
@@ -38,14 +36,15 @@ public MatchService(
     }
 
     // 전체 경기 목록 조회
-    @Transactional()
+    @Transactional(readOnly = true)
     public List<MatchResponseDto> getAllMatches() {
         List<Match> matches = matchRepository.findAllByOrderByMatchDateTimeDesc();
 
         return matches.stream().map(MatchResponseDto::new).collect(Collectors.toList());
     }
 
     // 경기 개설
+    @Transactional
     public void createMatch(MatchCreateRequestDto requestDto) {
         User user =
                 userRepository
@@ -67,6 +66,7 @@ public void createMatch(MatchCreateRequestDto requestDto) {
     }
 
     // 경기 참여 신청
+    @Transactional
     public void joinMatch(Long matchId, String cognitoSub) {
         Match match =
                 matchRepository
@@ -105,6 +105,7 @@ public void joinMatch(Long matchId, String cognitoSub) {
     }
 
     // 경기 참여 취소(일반회원)
+    @Transactional
     public void leaveMatch(Long matchId, String cognitoSub) {
         Match match =
                 matchRepository
@@ -125,6 +126,7 @@ public void leaveMatch(Long matchId, String cognitoSub) {
     }
 
     // 매치 삭제 기능
+    @Transactional
     public void deleteMatchById(Long matchId) {
         if (!matchRepository.existsById(matchId)) {
             throw new IllegalArgumentException("해당 매치를 찾을 수 없습니다.");

src/main/java/com/nextcloudlab/kickytime/user/service/CognitoBackfillService.java

@@ -4,11 +4,11 @@
 
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import com.nextcloudlab.kickytime.user.entity.User;
 import com.nextcloudlab.kickytime.user.repository.UserRepository;
 
-import jakarta.transaction.Transactional;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import software.amazon.awssdk.services.cognitoidentityprovider.CognitoIdentityProviderClient;
@@ -24,10 +24,12 @@ public class CognitoBackfillService {
     @Value("${app.cognito.user-pool-id}")
     private String userPoolId;
 
+    @Transactional(readOnly = true)
     public BackfillReport backfillAllUsers() {
         return backfillReport();
     }
 
+    @Transactional
     public BackfillReport backfillReport() {
         int processed = 0, created = 0, updated = 0;
 

src/main/java/com/nextcloudlab/kickytime/user/service/UserService.java

@@ -2,13 +2,13 @@
 
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.server.ResponseStatusException;
 
 import com.nextcloudlab.kickytime.user.dto.UserDto;
 import com.nextcloudlab.kickytime.user.entity.User;
 import com.nextcloudlab.kickytime.user.repository.UserRepository;
 
-import jakarta.transaction.Transactional;
 import lombok.RequiredArgsConstructor;
 
 @Service
@@ -45,7 +45,7 @@ public User findOrCreateUser(
                         });
     }
 
-    @Transactional
+    @Transactional(readOnly = true)
     public UserDto getByCognitoSub(String cognitoSub) {
         User me =
                 userRepository