fix(dataflows): don't report a symbol as unavailable over an unsettled bar

- a newest bar with no close made load_ohlcv reject the whole frame, so the
  routing layer answered with its no-data sentinel: the caller lost the entire
  price history and was told the symbol may be invalid, delisted or not
  covered, when only the latest session had not settled
- treat a closeless newest bar as an unsettled session instead. The gap fill
  already drops it, here and mid-series alike, so the frame ends at the last
  settled bar; only a range with no close anywhere is still no data
- the staleness check keeps deciding whether what remains is recent enough, so
  falling back cannot resurrect a long-dead series
- log which bars had no close and which date is being used as the latest close

tests/test_ohlcv_latest_bar.py

@@ -4,8 +4,12 @@ yfinance can return the newest in-range bar with a NaN close (an unsettled or
 glitched session). The old path parsed dates without normalizing timezone and
 dropped every NaN-close row before applying the curr_date cutoff, so the latest
 bar disappeared and the previous trading day looked like the latest. Now dates
-are normalized, and a latest in-range bar with no close raises rather than
+are normalized before the cutoff, so the frame ends at the last settled bar
-silently falling back.
+instead of carrying a fabricated close.
+
+Refusing the whole frame instead (the first attempt at #1201) reported a
+tradable symbol as invalid or delisted (#1289), so only a range with no close
+anywhere counts as no data and the staleness check judges the rest.
 """
 from __future__ import annotations
 
@@ -92,19 +96,46 @@ def _run_load(monkeypatch, tmp_path, frame, curr_date):
     def _fail_download(*a, **k):
         raise AssertionError("should use the seeded cache, not download")
     monkeypatch.setattr(su.yf, "download", _fail_download)
-    monkeypatch.setattr(su, "_assert_ohlcv_not_stale", lambda *a, **k: None)
     return su.load_ohlcv("AAPL", curr_date)
 
 
 @pytest.mark.unit
-def test_latest_in_range_nan_close_raises_not_silent_fallback(monkeypatch, tmp_path):
+def test_unsettled_latest_bar_is_served_as_the_last_settled_bar(monkeypatch, tmp_path):
-    # Newest bar (the curr_date) has no close -> raise, don't return Thursday.
+    # Newest bar (the curr_date) has no close: serve the last settled bar rather
+    # than reporting the whole symbol as unavailable (#1289).
     frame = pd.DataFrame({
         "Date": ["2026-05-07", "2026-05-08"],
         "Open": [100.0, 101.0], "High": [101.0, 102.0], "Low": [99.0, 100.0],
         "Close": [100.5, float("nan")], "Volume": [1_000_000, 1_000_000],
     })
-    with pytest.raises(NoMarketDataError, match="no closing price"):
+    out = _run_load(monkeypatch, tmp_path, frame, "2026-05-08")
+    assert out["Date"].iloc[-1] == pd.Timestamp("2026-05-07")
+    assert out["Close"].iloc[-1] == 100.5
+
+
+@pytest.mark.unit
+def test_no_settled_bar_at_all_is_still_no_data(monkeypatch, tmp_path):
+    frame = pd.DataFrame({
+        "Date": ["2026-05-07", "2026-05-08"],
+        "Open": [100.0, 101.0], "High": [101.0, 102.0], "Low": [99.0, 100.0],
+        "Close": [float("nan"), float("nan")], "Volume": [1_000_000, 1_000_000],
+    })
+    with pytest.raises(NoMarketDataError, match="no bar in range has a closing price"):
+        _run_load(monkeypatch, tmp_path, frame, "2026-05-08")
+
+
+@pytest.mark.unit
+def test_serving_the_last_settled_bar_does_not_bypass_the_staleness_check(
+    monkeypatch, tmp_path
+):
+    # Falling back must not resurrect a long-dead series: once the closeless
+    # tail is gone, the remaining bar is judged on its age like any other.
+    frame = pd.DataFrame({
+        "Date": ["2026-01-05", "2026-05-08"],
+        "Open": [100.0, 101.0], "High": [101.0, 102.0], "Low": [99.0, 100.0],
+        "Close": [100.5, float("nan")], "Volume": [1_000_000, 1_000_000],
+    })
+    with pytest.raises(NoMarketDataError, match="stale"):
         _run_load(monkeypatch, tmp_path, frame, "2026-05-08")
 
 

tradingagents/dataflows/stockstats_utils.py

@@ -250,13 +250,24 @@ def load_ohlcv(symbol: str, curr_date: str) -> pd.DataFrame:
     # Filter to curr_date to prevent look-ahead bias in backtesting.
     data = data[data["Date"] <= curr_date_dt]
 
-    # Guard the latest in-range bar before dropping incomplete rows: a newest bar
+    # A newest bar with no close is usually an unsettled session — mid-session,
-    # with no close is "not settled yet", not "does not exist". Silently dropping
+    # a holiday, or a thinly traded instrument — not a symbol without data.
-    # it would make the previous trading day look like the latest (#1201); raise
+    # _fill_price_gaps below drops it, here and mid-series alike, so the frame
-    # instead so the router surfaces it rather than fabricating a fallback.
+    # ends at the last settled bar rather than carrying a fabricated close
+    # (#1201). Refusing the whole frame instead reported a tradable symbol as
+    # invalid or delisted (#1289), so only a range with no close anywhere is
+    # treated as no data; the staleness check decides whether what remains is
+    # recent enough for curr_date.
     if not data.empty and pd.isna(data["Close"].iloc[-1]):
+        settled = data["Close"].notna().to_numpy().nonzero()[0]
+        if settled.size == 0:
             raise NoMarketDataError(
-            symbol, canonical, "latest in-range OHLCV bar has no closing price"
+                symbol, canonical, "no bar in range has a closing price"
+            )
+        logger.warning(
+            "%s: %d trailing bar(s) through %s have no closing price; using %s "
+            "as the latest close.", canonical, len(data) - settled[-1] - 1,
+            data["Date"].iloc[-1].date(), data["Date"].iloc[settled[-1]].date(),
         )
 
     data = _fill_price_gaps(data)