diff --git a/backend/app/api/hold_timing.py b/backend/app/api/hold_timing.py
index bc6f527..fb487e9 100644
--- a/backend/app/api/hold_timing.py
+++ b/backend/app/api/hold_timing.py
@@ -18,10 +18,20 @@ def _ts(v: Any) -> int | None:
     return n if n > 0 else None
 
 
-def first_perp_close_ts_ms(fills: Sequence[Mapping[str, Any]]) -> int | None:
+def _as_map(row: Mapping[str, Any] | Any) -> Mapping[str, Any]:
+    if isinstance(row, Mapping):
+        return row
+    try:
+        return dict(row)
+    except Exception:
+        return {}
+
+
+def first_perp_close_ts_ms(fills: Sequence[Mapping[str, Any] | Any]) -> int | None:
     """永续平仓成交时间（目标只平永续时作为持仓结束时刻）。"""
     best: int | None = None
-    for f in fills:
+    for raw in fills:
+        f = _as_map(raw)
         if str(f.get("leg") or "") != "perp":
             continue
         if str(f.get("action") or "") != "close":
@@ -35,7 +45,7 @@ def first_perp_close_ts_ms(fills: Sequence[Mapping[str, Any]]) -> int | None:
 
 
 def hold_timing(
-    group: Mapping[str, Any], fills: Sequence[Mapping[str, Any]]
+    group: Mapping[str, Any] | Any, fills: Sequence[Mapping[str, Any] | Any]
 ) -> dict[str, Any]:
     """
     返回展示用开仓/平仓/持仓时长。
@@ -45,10 +55,11 @@ def hold_timing(
       - `target_perp_only` / `option_residual`：永续平仓 fill 时间
       - 其它已平：groups.close_at_ms（缺则回退成交）
     """
-    open_ms = _ts(group.get("open_at_ms"))
-    status = str(group.get("status") or "")
-    reason = str(group.get("close_reason") or "")
-    group_close = _ts(group.get("close_at_ms"))
+    g = _as_map(group)
+    open_ms = _ts(g.get("open_at_ms"))
+    status = str(g.get("status") or "")
+    reason = str(g.get("close_reason") or "")
+    group_close = _ts(g.get("close_at_ms"))
     perp_close = first_perp_close_ts_ms(fills)
 
     use_perp = reason == "target_perp_only" or status == "option_residual"
diff --git a/backend/tests/test_hold_timing.py b/backend/tests/test_hold_timing.py
index 79b9c4d..141817a 100644
--- a/backend/tests/test_hold_timing.py
+++ b/backend/tests/test_hold_timing.py
@@ -55,9 +55,32 @@ def test_hold_dual_leg_uses_group_close():
     assert h["hold_basis"] == "group"
 
 
-def test_hold_open_no_close():
-    g = {"open_at_ms": 100, "close_at_ms": None, "status": "open", "close_reason": None}
-    h = hold_timing(g, [])
-    assert h["hold_close_at_ms"] is None
-    assert h["hold_ms"] is None
-    assert h["hold_basis"] == "open"
+def test_hold_sqlite_row_like_without_get():
+    """sqlite3.Row 无 .get，需能转 dict。"""
+
+    class Row:
+        def __init__(self, d):
+            self._d = d
+
+        def keys(self):
+            return self._d.keys()
+
+        def __getitem__(self, k):
+            return self._d[k]
+
+        def __iter__(self):
+            return iter(self._d)
+
+    g = Row(
+        {
+            "open_at_ms": 100,
+            "close_at_ms": None,
+            "status": "option_residual",
+            "close_reason": "target_perp_only",
+        }
+    )
+    fills = [Row({"leg": "perp", "action": "close", "ts_ms": 400})]
+    h = hold_timing(g, fills)
+    assert h["hold_close_at_ms"] == 400
+    assert h["hold_ms"] == 300
+
diff --git a/docs/更新说明.md b/docs/更新说明.md
index dd9154d..ea74477 100644
--- a/docs/更新说明.md
+++ b/docs/更新说明.md
@@ -5,6 +5,15 @@
 
 ---
 
+## 2026-07-27 — 修复交易记录 500（记录未丢）
+
+### 变更
+
+1. `/api/trades/groups` 因 `sqlite3.Row` 无 `.get` 抛错导致「Internal Server Error / 暂无成交组」假象。  
+2. 持仓周期计算改为兼容 Row；库内成交组仍在。
+
+---
+
 ## 2026-07-27 — 交易记录：开仓/平仓时间与持仓周期
 
 ### 变更