fix(hub): merge strategy snapshots into archive for gate_bot

Include strategy_trade_snapshots when trade_records is empty, harden SQL for older schemas, and show per-exchange sync errors in the archive UI.

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

manual_trading_hub/static/archive.js

@@ -410,6 +410,9 @@
     const r = await apiFetch("/api/archive/meta");
     meta = await r.json();
     timeframe = (meta && meta.default_timeframe) || "15m";
+    if (meta && meta.last_sync && elStatus && !elStatus.textContent) {
+      setStatus(formatSyncSummary(meta.last_sync));
+    }
     renderExchangeOptions();
     if (elTfTabs) {
       elTfTabs.querySelectorAll(".archive-tf-btn").forEach(function (btn) {
@@ -418,16 +421,30 @@
     }
   }
 
+  function formatSyncSummary(j) {
+    const results = j.results || [];
+    const okN = results.filter(function (x) {
+      return x.ok !== false;
+    }).length;
+    const parts = ["同步完成 · " + okN + "/" + (j.exchanges || 0) + " 所"];
+    results.forEach(function (row) {
+      const label = row.exchange_key || row.name || "?";
+      if (row.ok === false) {
+        parts.push(label + " 失败: " + (row.msg || "未知错误"));
+      } else {
+        parts.push(label + " " + (row.trade_count != null ? row.trade_count : row.trades || 0) + " 笔");
+      }
+    });
+    return parts.join(" · ");
+  }
+
   async function syncAll() {
     setStatus("同步中（可能需数分钟）…");
     elBtnSync && (elBtnSync.disabled = true);
     try {
       const r = await apiFetch("/api/archive/sync", { method: "POST" });
       const j = await r.json();
-      const okN = (j.results || []).filter(function (x) {
-        return x.ok !== false;
-      }).length;
-      setStatus("同步完成 · " + okN + "/" + (j.exchanges || 0) + " 所");
+      setStatus(formatSyncSummary(j));
       await loadList();
       if (selected) await openDetail(selected.exchange_key, selected.symbol);
     } catch (e) {