fix(dataflows): map crypto to StockTwits/Reddit sentiment symbols

- crypto reached StockTwits as Yahoo's BTC-USD (404) instead of BTC.X, and Reddit
  searched the dashed pair that barely matches; both now resolve the base via a
  shared crypto_base() helper, restoring crypto sentiment
- also fixes a StockTwits resilience test class that pytest never collected #1113

tests/test_reddit_fallback.py

@@ -190,3 +190,25 @@ class TestFormatterHandlesRssPosts:
         assert "1234↑" in out
         assert "56c" in out
         assert "via RSS" not in out
+
+
+@pytest.mark.unit
+class TestCryptoSearchTerm:
+    """A crypto pair (BTC-USD) barely matches Reddit text; search the base (#1113)."""
+
+    def _captured_ticker(self, ticker):
+        seen = {}
+
+        def fake_fetch(t, sub, limit, timeout):
+            seen["ticker"] = t
+            return []
+
+        with patch.object(reddit, "_fetch_subreddit", side_effect=fake_fetch):
+            reddit.fetch_reddit_posts(ticker, subreddits=("stocks",), inter_request_delay=0)
+        return seen["ticker"]
+
+    def test_crypto_pair_searches_base(self):
+        assert self._captured_ticker("BTC-USD") == "BTC"
+
+    def test_equity_passes_through(self):
+        assert self._captured_ticker("NVDA") == "NVDA"

tests/test_stocktwits_resilience.py

@@ -1,5 +1,9 @@
-"""StockTwits fetch degrades (never raises) on transport errors, including the
-http.client chunked-transfer exceptions that are not OSErrors (#1024)."""
+"""StockTwits fetch: transport-error resilience (#1024) and crypto symbol
+mapping (#1113).
+
+StockTwits lists crypto under ``<BASE>.X`` (Yahoo's ``BTC-USD`` 404s), and any
+transport error must degrade to a placeholder rather than raise.
+"""
 
 from __future__ import annotations
 
@@ -26,7 +30,7 @@ def _raise(exc):
 
 
 @pytest.mark.unit
-class StockTwitsResilienceTests:
+class TestStockTwitsResilience:
     @pytest.mark.parametrize(
         "exc",
         [
@@ -40,3 +44,34 @@ class StockTwitsResilienceTests:
             out = stocktwits.fetch_stocktwits_messages("NVDA")
         assert "unavailable" in out.lower()
         assert out.startswith("<stocktwits unavailable")
+
+
+@pytest.mark.unit
+class TestStockTwitsCryptoSymbols:
+    @pytest.mark.parametrize(
+        ("ticker", "expected"),
+        [
+            ("BTC-USD", "BTC.X"),
+            ("eth-usd", "ETH.X"),
+            ("SOL-USD", "SOL.X"),
+            ("BTCUSD", "BTC.X"),      # undashed broker form
+            ("BTC-USDT", "BTC.X"),    # stablecoin quote
+            ("AMD", "AMD"),
+            ("BRK-B", "BRK-B"),       # dashed class share: untouched
+            ("GOLD", "GOLD"),         # real equity (aliases elsewhere): untouched here
+            ("XYZ-USD", "XYZ-USD"),   # unknown base: not treated as crypto
+        ],
+    )
+    def test_symbol_mapping(self, ticker, expected):
+        assert stocktwits._stocktwits_symbol(ticker) == expected
+
+    def test_crypto_pair_requests_dot_x_endpoint(self):
+        seen = {}
+
+        def fake_urlopen(req, timeout=None):
+            seen["url"] = req.full_url
+            raise TimeoutError("stop after capturing the URL")
+
+        with patch.object(stocktwits, "urlopen", side_effect=fake_urlopen):
+            stocktwits.fetch_stocktwits_messages("BTC-USD")
+        assert "/symbol/BTC.X.json" in seen["url"]

tests/test_symbol_utils.py

@@ -6,6 +6,7 @@ import pytest
 
 from tradingagents.dataflows.symbol_utils import (
     NoMarketDataError,
+    crypto_base,
     is_yahoo_safe,
     normalize_symbol,
 )
@@ -77,5 +78,25 @@ class TestIsYahooSafe(unittest.TestCase):
             self.assertFalse(is_yahoo_safe(sym))
 
 
+@pytest.mark.unit
+class TestCryptoBase(unittest.TestCase):
+    def test_resolves_known_crypto_forms(self):
+        for raw in ("BTC-USD", "BTCUSD", "btc-usdt", "BTC-USDC", "BTCUSD+"):
+            self.assertEqual(crypto_base(raw), "BTC")
+        self.assertEqual(crypto_base("ETH-USD"), "ETH")
+        self.assertEqual(crypto_base("sol-usd"), "SOL")
+
+    def test_non_crypto_returns_none(self):
+        # Plain equities, class shares, and real tickers that alias elsewhere
+        # (GOLD -> gold future on the Yahoo path) must NOT read as crypto.
+        for raw in ("AAPL", "BRK-B", "GOLD", "XYZ-USD", "EURUSD", "", None):
+            self.assertIsNone(crypto_base(raw))
+
+    def test_agrees_with_normalize_symbol(self):
+        # crypto_base is the shared primitive behind the -USD normalization.
+        self.assertEqual(normalize_symbol("BTCUSD"), "BTC-USD")
+        self.assertEqual(crypto_base("BTCUSD"), "BTC")
+
+
 if __name__ == "__main__":
     unittest.main()