[FIX] auctionId 통해 member 조회 - zset에서 set으로 변경

src/main/java/com/dailyon/notificationservice/domain/notification/service/RedisUtilService.java

@@ -7,6 +7,7 @@
 import org.springframework.data.domain.Range;
 import org.springframework.data.redis.connection.RedisZSetCommands;
 import org.springframework.data.redis.core.ReactiveRedisTemplate;
+import org.springframework.data.redis.core.ReactiveSetOperations;
 import org.springframework.stereotype.Service;
 import reactor.core.publisher.Flux;
 
@@ -15,11 +16,12 @@
 @Service
 public class RedisUtilService {
     private final ReactiveRedisTemplate<String, Long> reactiveRedisTemplate;
+    private final ReactiveSetOperations<String, Long> reactiveSetOperations;
 
     public Flux<Long> fetchAllAuctionMemberIds(String auctionId) {
-        return reactiveRedisTemplate.opsForZSet()
-                .reverseRangeByScore(auctionId, Range.<Double>unbounded(), RedisZSetCommands.Limit.unlimited());
+        return reactiveSetOperations.members(auctionId)
+                .doOnNext(memberId -> log.info("Fetched auction member ID: {}", memberId))
+                .doOnError(error -> log.error("Error fetching auction member IDs for Auction ID: {}, error: {}", auctionId, error.getMessage()))
+                .doOnComplete(() -> log.info("Completed fetching auction member IDs for Auction ID: {}", auctionId));
     }
-
-
 }