Fix empty recommend list when CTP ticks unavailable off-hours.

Fall back to daily prev_close for margin estimates; keep previous cache when refresh gets all no_price; stop re-fetching only for missing turnover.

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

modules/trading/recommend_store.py

@@ -99,8 +99,6 @@ def recommend_cache_needs_refresh(
         return True
     if rows_missing_category(rows):
         return True
-    if rows_missing_turnover(rows):
-        return True
     if rows_missing_contract_spec(rows):
         return True
     if float(capital or 0) > 0 and not rows:
@@ -294,6 +292,29 @@ def refresh_recommend_cache(
         margin_used=used,
     )
     rows = filter_affordable_recommendations(all_rows)
+    prev_rows: list[dict] = []
+    try:
+        prev_row = conn.execute(
+            "SELECT rows_json FROM product_recommend_cache WHERE id=1",
+        ).fetchone()
+        if prev_row:
+            prev_rows = json.loads(prev_row["rows_json"] or "[]")
+            if not isinstance(prev_rows, list):
+                prev_rows = []
+    except Exception:
+        prev_rows = []
+    if not rows and prev_rows:
+        no_price = sum(1 for r in all_rows if r.get("status") == "no_price")
+        if not all_rows or no_price >= max(1, len(all_rows) // 2):
+            logger.warning(
+                "recommend refresh: keeping previous %d rows "
+                "(affordable=0, no_price=%d/%d, capital=%.2f)",
+                len(prev_rows),
+                no_price,
+                len(all_rows),
+                float(capital or 0),
+            )
+            rows = prev_rows
     if not rows and float(capital or 0) > 0:
         logger.warning(
             "recommend refresh: 0 affordable rows capital=%.2f total=%d no_price=%d blocked=%d",