diff --git a/backend/tests/test_backtest_warmup.py b/backend/tests/test_backtest_warmup.py
index 3f00134..82bd37b 100644
--- a/backend/tests/test_backtest_warmup.py
+++ b/backend/tests/test_backtest_warmup.py
@@ -49,9 +49,17 @@ def test_load_panel_warms_up_indicators(monkeypatch) -> None:
     # warmup 行不进入结果面板 (pandas datetime64 与 date 直接比较会类型不符)
     assert str(panel["date"].min())[:10] == start.isoformat()
     assert str(panel["date"].max())[:10] == end.isoformat()
-    # 区间首日的指标已有历史窗口可用, 不再是 NaN
+
+    # 数值复现: 区间头部的指标必须与「全历史计算后裁剪」的基准一致。
+    # 只断言非 NaN 区分不了新旧代码 —— ewm 类指标 (RSI/MACD) 从首个值
+    # 播种, 无 warmup 时首行也有值, 只是数值失真 (#201 的实际危害)
+    from app.indicators.pipeline import compute_all
+    reference = compute_all(df).filter(pl.col("date") >= start)
+    ref_rsi = float(reference["rsi_14"][0])
     first = panel.iloc[0]
-    assert first["rsi_14"] == first["rsi_14"]  # NaN != NaN
+    assert abs(first["rsi_14"] - ref_rsi) < 1.0, (
+        f"rsi_14 without warmup: {first['rsi_14']} vs reference {ref_rsi}"
+    )
 
 
 def test_load_panel_insufficient_history_degrades_gracefully(monkeypatch) -> None:
diff --git a/backend/tests/test_screener_external_access.py b/backend/tests/test_screener_external_access.py
index 6f4c2d8..6640e1d 100644
--- a/backend/tests/test_screener_external_access.py
+++ b/backend/tests/test_screener_external_access.py
@@ -37,7 +37,7 @@ def test_normal_condition_still_works() -> None:
 
 def test_injected_read_parquet_is_rejected() -> None:
     # 注入试图读任意文件: external_access 关闭后 DuckDB 直接报错,
-    # run_custom 的 except 分支吞错返回空结果, 而非泄漏文件内容
+    # run() 的 except 分支吞错返回空结果, 而非泄漏文件内容
     svc = _service_with_panel(_panel())
     result = svc.run(
         date(2026, 9, 2),
@@ -47,6 +47,25 @@ def test_injected_read_parquet_is_rejected() -> None:
     assert result.rows == []
 
 
+def test_injected_read_of_valid_parquet_leaks_nothing(tmp_path) -> None:
+    # 用合法 parquet 做注入目标才能区分新旧代码: /etc/passwd 不是 parquet,
+    # 未加固的连接读它也会报错; 合法同构文件在未加固连接下会真的混入结果
+    victim = tmp_path / "victim.parquet"
+    _panel().write_parquet(victim)
+    svc = _service_with_panel(pl.DataFrame(
+        {"symbol": ["999999.SZ"], "close": [99.0], "turnover_rate": [9.0]}
+    ))
+    result = svc.run(
+        date(2026, 9, 2),
+        [f"1=1) UNION SELECT * FROM read_parquet('{victim}') --"],
+        limit=10,
+    )
+    # 加固后注入被拒 → 整条查询 fail-closed 返回空 (或至多剩原面板行);
+    # 未加固时 victim 的 2 行会混入结果
+    assert all(r["symbol"] == "999999.SZ" for r in result.rows)
+    assert len(result.rows) <= 1
+
+
 def test_injected_copy_write_is_rejected(tmp_path) -> None:
     target = tmp_path / "pwned.csv"
     svc = _service_with_panel(_panel())