fix(hub): merge mark price from Flask snapshot and fix board refresh

Sync hub positions with instance price_snapshot (order_prices and position_marks).
Fix monitor board UI when hub restarts (version rewind) and queue snapshot fetches.
Expose board aggregate status on /api/ping for diagnostics.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/static/app.js

@@ -12,6 +12,7 @@
   let lastMonitorBoardUpdatedAt = "";
   let localBoardVersion = 0;
   let monitorBoardInFlight = false;
+  let monitorBoardFetchPending = false;
   let monitorBoardSlowHintTimer = null;
   let boardEventSource = null;
   let sseReconnectTimer = null;
@@ -384,7 +385,7 @@
       try {
         const st = JSON.parse(ev.data || "{}");
         const ver = Number(st.board_version) || 0;
-        if (ver > localBoardVersion) {
+        if (ver !== localBoardVersion) {
           void fetchMonitorBoardSnapshot({ background: true });
         } else if (st.aggregating && lastMonitorRows.length) {
           applyMonitorBoardUi(lastMonitorRows, st.updated_at || lastMonitorBoardUpdatedAt, {
@@ -468,7 +469,7 @@
     if (!cached) return false;
     lastMonitorRows = cached.rows;
     lastMonitorBoardUpdatedAt = cached.updated_at || "";
-    localBoardVersion = Number(cached.board_version) || 0;
+    localBoardVersion = 0;
     applyMonitorBoardUi(cached.rows, lastMonitorBoardUpdatedAt, { stale: true });
     return true;
   }
@@ -660,7 +661,10 @@
     const background = !!options.background;
     const showLoading = !!options.showLoading && !lastMonitorRows.length;
     const box = document.getElementById("monitor-grid");
-    if (monitorBoardInFlight && background) return;
+    if (monitorBoardInFlight) {
+      if (background) monitorBoardFetchPending = true;
+      else return;
+    }
     if (showLoading && box) {
       box.innerHTML =
         '<div class="board-loading"><span class="board-loading-spin" aria-hidden="true"></span>正在加载监控快照…<p class="board-loading-sub"></p></div>';
@@ -687,11 +691,14 @@
         }
         return;
       }
-      if (ver >= localBoardVersion || !lastMonitorRows.length) {
+      const ts = data.updated_at || "";
+      const versionChanged = ver !== localBoardVersion;
+      const timeChanged = ts && ts !== lastMonitorBoardUpdatedAt;
+      if (versionChanged || timeChanged || !lastMonitorRows.length) {
         localBoardVersion = ver;
         lastMonitorRows = rows;
-        saveMonitorBoardCache(lastMonitorRows, data.updated_at, ver);
-        applyMonitorBoardUi(lastMonitorRows, data.updated_at, {
+        saveMonitorBoardCache(lastMonitorRows, ts, ver);
+        applyMonitorBoardUi(lastMonitorRows, ts, {
           stale: !!data.aggregating,
         });
       } else if (data.aggregating && lastMonitorRows.length) {
@@ -715,6 +722,10 @@
       clearTimeout(fetchTimer);
       clearMonitorBoardSlowHint();
       monitorBoardInFlight = false;
+      if (monitorBoardFetchPending) {
+        monitorBoardFetchPending = false;
+        void fetchMonitorBoardSnapshot({ background: true });
+      }
     }
   }
 
@@ -724,6 +735,7 @@
     }
     try {
       await requestMonitorBoardRefresh();
+      await fetchMonitorBoardSnapshot({ background: false });
     } catch (e) {
       showToast(String(e), true);
     }