Hotfix: 노래 캐싱 로그 추가 및 스냅샷 최신화 (#450)

* fix: InMemorySongsScheduler 스냅샷 최신화 및 로그 설정

* fix: 노래 캐시 스케줄러 로깅 추가

backend/src/main/java/shook/shook/song/application/InMemorySongsScheduler.java

@@ -2,6 +2,7 @@
 
 import jakarta.annotation.PostConstruct;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 import org.springframework.transaction.annotation.Transactional;
@@ -10,6 +11,7 @@
 
 @RequiredArgsConstructor
 @Transactional(readOnly = true)
+@Slf4j
 @Component
 public class InMemorySongsScheduler {
 
@@ -23,6 +25,7 @@ public void initialize() {
 
     @Scheduled(cron = "${schedules.in-memory-song.cron}")
     public void recreateCachedSong() {
+        log.info("InMemorySongsScheduler worked");
         inMemorySongs.recreate(songRepository.findAllWithKillingParts());
     }
 }