diff --git a/backend/app/api/data.py b/backend/app/api/data.py
index 08cee45..4aaaf39 100644
--- a/backend/app/api/data.py
+++ b/backend/app/api/data.py
@@ -862,3 +862,22 @@ def get_version(request: Request) -> dict:
             return {"version": v}
 
     return {"version": "v0.0.0"}
+
+
+@router.post("/refresh-cache")
+def refresh_cache(request: Request) -> dict:
+    """重建 Polars 内存缓存 (clear + refresh), 不清数据、不清 alerts。
+
+    用于跨天后缓存残留、或维表更新后手动刷新场景。
+    与设置页「清理并刷新」的区别: 那个清前端 react-query, 这个重建后端 enriched 缓存。
+    """
+    repo = request.app.state.repo
+    repo.clear_cache()
+    repo.refresh_cache()
+    # 清除 Overview 总览聚合结果缓存 + Screener 历史 TTL 缓存
+    from app.api.overview import invalidate_overview_cache
+    invalidate_overview_cache()
+    from app.services.screener import ScreenerService
+    ScreenerService.clear_history_cache()
+    logger.info("refresh-cache: Polars 缓存已重建")
+    return {"ok": True}
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index 00a2565..c3a22e8 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -1317,6 +1317,7 @@ export const api = {
 
   dataStatus: () => request<DataStatus>('/api/data/status'),
   dataClear: () => request<{ deleted_files: number }>('/api/data/clear', { method: 'POST' }),
+  refreshCache: () => request<{ ok: boolean }>('/api/data/refresh-cache', { method: 'POST' }),
   enrichedSchema: (table: string) => request<EnrichedField[]>(`/api/data/schema/${table}`),
 
   testEndpoint: (url: string, rounds?: number) =>
diff --git a/frontend/src/pages/Dashboard.tsx b/frontend/src/pages/Dashboard.tsx
index feff432..be56704 100644
--- a/frontend/src/pages/Dashboard.tsx
+++ b/frontend/src/pages/Dashboard.tsx
@@ -573,10 +573,14 @@ export function Dashboard() {
     }).catch(() => { /* 查询失败不阻塞, 用户仍可手动点击获取 */ })
   }, [hasNoData, fetchJobId])
 
-  // 手动刷新: 显示旋转动画; SSE 自动刷新: 静默, 无体感
+  // 手动刷新: 先重建后端 Polars 缓存(解决跨天残留), 再重新拉看板数据
   const handleRefresh = () => {
     setManualFetching(true)
-    overview.refetch().finally(() => setManualFetching(false))
+    api.refreshCache()
+      .then(() => qc.invalidateQueries({ queryKey: ['overview-market'] }))
+      .finally(() => {
+        overview.refetch().finally(() => setManualFetching(false))
+      })
   }
 
   if (overview.isLoading && !data) {
@@ -671,7 +675,7 @@ export function Dashboard() {
             disabled={manualFetching}
             className="inline-flex items-center gap-1 rounded-btn border border-border bg-elevated px-2 py-1 text-[11px] text-secondary transition-colors hover:text-foreground disabled:opacity-50"
           >
-            <RefreshCw className={`h-3 w-3 ${manualFetching ? 'animate-spin' : ''}`} />刷新
+            <RefreshCw className={`h-3 w-3 ${manualFetching ? 'animate-spin' : ''}`} />重载
           </button>
         </div>
       </div>