서버 알림목록 오류 수정

frontend/src/utils/resolveNotificationStrategy.ts

@@ -27,16 +27,20 @@ export function normalizeStrategyId(id: unknown): number | null {
 
 async function getStrategiesList(force = false): Promise<StrategyDto[]> {
   const now = Date.now();
-  if (!force && strategiesCache && now - strategiesCacheAt < CACHE_MS) {
+  // 빈 배열은 캐시하지 않는다 — 백엔드 미준비로 빈 결과가 반환된 경우 재시도 허용
+  if (!force && strategiesCache && strategiesCache.length > 0 && now - strategiesCacheAt < CACHE_MS) {
     return strategiesCache;
   }
   const list = await loadStrategies();
-  strategiesCache = list ?? [];
-  strategiesCacheAt = now;
-  reconcileStrategyMissingWithValidIds(
-    strategiesCache.map(s => s.id).filter((id): id is number => id != null && id > 0),
-  );
-  return strategiesCache;
+  const result = list ?? [];
+  if (result.length > 0) {
+    strategiesCache = result;
+    strategiesCacheAt = now;
+    reconcileStrategyMissingWithValidIds(
+      result.map(s => s.id).filter((id): id is number => id != null && id > 0),
+    );
+  }
+  return result;
 }
 
 function findStrategyByName(list: StrategyDto[], name: string): StrategyDto | undefined {
@@ -74,7 +78,8 @@ export async function resolveNotificationStrategy(
   market?: string | null,
 ): Promise<ResolvedNotificationStrategy> {
   const normalizedId = normalizeStrategyId(strategyId);
-  const list = prefetched ?? await getStrategiesList();
+  // prefetched가 빈 배열이면 직접 API로 재시도 (백엔드 미준비 시 prefetch가 빈 채로 캐시될 수 있음)
+  const list = (prefetched != null && prefetched.length > 0) ? prefetched : await getStrategiesList();
 
   if (normalizedId != null) {
     const fromList = list.find(s => s.id === normalizedId);