Merge PR #1864: preserve combined crypto routing fixes

agent/backtest/engines/_market_hooks.py

@@ -121,6 +121,14 @@ _MARKET_PATTERNS = [
     (re.compile(r"^[A-Z0-9]+\.VN$", re.I), "vietnam_equity"),
     (re.compile(r"^(?=[A-Z0-9]*[A-Z])[A-Z0-9]+-USDT$", re.I), "crypto"),
     (re.compile(r"^(?=[A-Z0-9]*[A-Z])[A-Z0-9]+/USDT$", re.I), "crypto"),
+    # USD-M perpetuals in their documented BASE-USDT-PERP spelling
+    # (ccxt_loader._parse_ccxt_symbol / binance_loader). Without this entry
+    # the symbol matched nothing above and fell through to the a_share
+    # default, so a leveraged perpetual ran under China A-share rules
+    # (100-share board-lot rounding) and every computed size rounded to a
+    # zero_size rejection (#1863). Base alphabet matches the loader's own
+    # ``([A-Z0-9]+)-USDT-PERP`` fullmatch.
+    (re.compile(r"^[A-Z0-9]+-USDT-PERP$", re.I), "crypto"),
     # yfinance's native crypto spelling (BTC-USD, ETH-USD). Distinct from
     # USDT pairs only in the quote currency; both belong to CryptoEngine.
     (re.compile(r"^(?=[A-Z0-9]*[A-Z])[A-Z0-9]+-USD$", re.I), "crypto"),

agent/tests/test_equity_crypto_suffix_regressions.py

@@ -48,6 +48,29 @@ def test_shared_engine_recognizes_known_slash_usd_crypto(symbol):
     assert _detect_market(symbol) == "crypto"
 
 
+@pytest.mark.parametrize(
+    "symbol",
+    [
+        "BTC-USDT-PERP",
+        "ETH-USDT-PERP",
+        # Numeric bases are legal on Binance USD-M (1000PEPE, 1MBABYDOGE)
+        # and ccxt_loader's own fullmatch allows [A-Z0-9]+ for the base.
+        "1000PEPE-USDT-PERP",
+        "1MBABYDOGE-USDT-PERP",
+    ],
+)
+def test_usdm_perpetual_symbols_route_to_crypto(symbol):
+    """BASE-USDT-PERP must run under CryptoEngine, not the a_share default.
+
+    Before #1863's fix the perpetual spelling matched no pattern, fell
+    through to ``a_share``, and the 100-share board-lot rounding turned
+    every computed size into a zero_size rejection.
+    """
+    from backtest.engines._market_hooks import _detect_market
+
+    assert _detect_market(symbol) == "crypto"
+
+
 @pytest.mark.parametrize(
     "symbol, expected",
     [