♻️ LocaldateTime -> Instant, lazy 예외 fix

Author: sehee123

backend/src/main/java/io/f1/backend/domain/game/app/RoomService.java

@@ -15,7 +15,6 @@
 import io.f1.backend.domain.game.dto.request.RoomValidationRequest;
 import io.f1.backend.domain.game.dto.response.GameSettingResponse;
 import io.f1.backend.domain.game.dto.response.PlayerListResponse;
-import io.f1.backend.domain.game.dto.response.QuizResponse;
 import io.f1.backend.domain.game.dto.response.RoomCreateResponse;
 import io.f1.backend.domain.game.dto.response.RoomListResponse;
 import io.f1.backend.domain.game.dto.response.RoomResponse;
@@ -30,7 +29,7 @@
 import io.f1.backend.domain.game.store.RoomRepository;
 import io.f1.backend.domain.quiz.app.QuizService;
 import io.f1.backend.domain.quiz.entity.Quiz;
-import java.time.LocalDateTime;
+import java.time.Instant;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
@@ -149,7 +148,7 @@ public RoomExitData exitRoom(Long roomId, String sessionId) {
         }
 
         SystemNoticeResponse systemNoticeResponse = new SystemNoticeResponse(
-            removedPlayer.getNickname() + "님이 퇴장하셨습니다.", LocalDateTime.now());
+            removedPlayer.getNickname() + "님이 퇴장하셨습니다.", Instant.now());
 
         PlayerListResponse playerListResponse = toPlayerListResponse(room);
 

backend/src/main/java/io/f1/backend/domain/game/dto/response/SystemNoticeResponse.java

@@ -1,7 +1,7 @@
 package io.f1.backend.domain.game.dto.response;
 
-import java.time.LocalDateTime;
+import java.time.Instant;
 
-public record SystemNoticeResponse(String noticeMessage, LocalDateTime timestamp) {
+public record SystemNoticeResponse(String noticeMessage, Instant timestamp) {
 
 }

backend/src/main/java/io/f1/backend/domain/quiz/app/QuizService.java

@@ -89,12 +89,16 @@ private String getExtension(String filename) {
         return filename.substring(filename.lastIndexOf(".") + 1);
     }
 
+    @Transactional(readOnly = true)
     public Quiz getQuizById(Long quizId) {
-        return quizRepository
+        Quiz quiz = quizRepository
             .findById(quizId)
             .orElseThrow(() -> new RuntimeException("E404002: 존재하지 않는 퀴즈입니다."));
+        quiz.getQuestions().size();
+        return quiz;
     }
 
+    @Transactional(readOnly = true)
     public Long getQuizMinId() {
         return quizRepository.getQuizMinId();
     }