diff --git a/backend/app/api/lots.py b/backend/app/api/lots.py
index 739b30e..b098f1e 100644
--- a/backend/app/api/lots.py
+++ b/backend/app/api/lots.py
@@ -4,6 +4,7 @@
 """
 from __future__ import annotations
 
+import logging
 import secrets
 import threading
 import time
@@ -31,6 +32,10 @@ def _resolve_asset_type(request: Request, symbol: str) -> str:
     try:
         return repo.resolve_asset_type(symbol) if repo is not None else "stock"
     except Exception:
+        # 回退为 stock 会让 etf 批次的止盈止损规则落入错误的监控轮, 必须留痕排查
+        logging.getLogger(__name__).warning(
+            "resolve_asset_type failed for %s, falling back to stock", symbol, exc_info=True
+        )
         return "stock"
 
 
diff --git a/backend/app/backtest/matrix.py b/backend/app/backtest/matrix.py
index bcf0198..7d7b17a 100644
--- a/backend/app/backtest/matrix.py
+++ b/backend/app/backtest/matrix.py
@@ -1435,7 +1435,7 @@ def _populate_matrix_derived_arrays(
             # 异常, 由 _resolve_matrix_storage_fields 的 vector 装载路径显式失败。
             if "float_shares" in vector_fields:
                 raise ValueError("matrix turnover_rate requires float_shares")
-            logger.info(
+            logger.debug(
                 "turnover_rate unavailable (asset has no float_shares); keeping NaN column"
             )
         else:
diff --git a/backend/app/strategy/monitor_rules.py b/backend/app/strategy/monitor_rules.py
index 972e276..787d313 100644
--- a/backend/app/strategy/monitor_rules.py
+++ b/backend/app/strategy/monitor_rules.py
@@ -261,7 +261,7 @@ def validate(rule: dict) -> None:
         try:
             date.fromisoformat(remind.strip())
         except ValueError:
-            raise ValueError(f"remind_date 必须是 YYYY-MM-DD 日期: {remind!r}")
+            raise ValueError(f"remind_date 必须是 YYYY-MM-DD 日期: {remind!r}") from None
         lead = rule.get("lead_days", 0)
         if isinstance(lead, bool) or not isinstance(lead, int) or lead < 0:
             raise ValueError("lead_days 必须是非负整数 (提前提醒天数)")