Fix Binance boot using OKX symbols after restart.

Startup ignored DB exchange choice and kept OKX ATM ids under a Binance health label, so option bid/ask stayed empty.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/exchange/binance/rest.py

@@ -55,19 +55,25 @@ class BinanceRestClient:
         return self._exchange_info
 
     def fetch_option_instruments(self, underlying: str) -> list[dict[str, Any]]:
-        """underlying 如 ETH / ETHUSDT。"""
+        """underlying 如 ETH / ETHUSDT。误传 OKX family（ETH-USD_UM）时映射到 ETHUSDT。"""
         info = self.fetch_option_exchange_info()
         rows = info.get("optionSymbols") or info.get("symbols") or []
         want = (underlying or "ETHUSDT").strip().upper()
-        eth_mode = want in ("ETH", "ETHUSDT") or want.startswith("ETH")
+        # 兼容误用 OKX 期权族名
+        if "USD_UM" in want or want in ("ETH-USD", "ETH-USDT", "ETHUSD"):
+            want = "ETHUSDT"
+        eth_mode = want in ("ETH", "ETHUSDT") or (
+            want.startswith("ETH") and "-" not in want
+        )
         out: list[dict[str, Any]] = []
         for row in rows:
             if not isinstance(row, dict):
                 continue
             u = str(row.get("underlying") or row.get("underlyingAsset") or "").upper()
             sym = str(row.get("symbol") or "").upper()
+            # 只收币安格式 ETH-YYMMDD-STRIKE-C/P，避免脏符号进缓存
             if eth_mode:
-                if sym.startswith("ETH-") or u.startswith("ETH"):
+                if sym.startswith("ETH-") and u.startswith("ETH"):
                     out.append(row)
                 continue
             base = want.replace("USDT", "") if want.endswith("USDT") else want

backend/app/main.py

@@ -30,9 +30,13 @@ def resolve_frontend_dist() -> Path:
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
-    settings = get_settings()
     db = Database()
     set_db(db)
+    # 必须在 set_db 之后读 DB 覆盖，否则会按 .env 默认 okx 起会话，
+    # 而 health 显示 DB 里的 binance → 合约号/盘口错乱（期权一直 -/-）
+    from .exchange.runtime import load_runtime_settings
+
+    settings = load_runtime_settings()
     engine = StrategyEngine()
     set_engine(engine)
     engine.ensure_loop()

backend/app/strategy/session.py

@@ -330,10 +330,14 @@ set_gateway = set_session
 
 
 def bootstrap_session(settings: Settings | None = None) -> StrategySession:
-    """main 启动：创建交易所 + 策略会话。"""
+    """main 启动：创建交易所 + 策略会话。始终以 DB 覆盖后的 runtime 为准。"""
     from ..exchange.runtime import load_runtime_settings
 
-    s = settings or load_runtime_settings()
+    # 忽略裸 get_settings()：重启后必须跟 DB 里选的交易所一致
+    try:
+        s = load_runtime_settings()
+    except Exception:
+        s = settings or get_settings()
     ex = build_exchange(s)
     set_exchange(ex)
     sess = StrategySession(s, ex)

backend/tests/test_binance_parse.py

@@ -57,3 +57,35 @@ def test_normalize_exchange() -> None:
     assert normalize_exchange_name("BN") == "binance"
     assert normalize_exchange_name("okx") == "okx"
     assert normalize_exchange_name(None) == "okx"
+
+
+def test_binance_maps_okx_family_name() -> None:
+    """误传 OKX family 时不应按 startswith(ETH) 乱匹配，应映射到 ETHUSDT。"""
+    from app.exchange.binance.rest import BinanceRestClient
+
+    cli = BinanceRestClient.__new__(BinanceRestClient)
+    cli._exchange_info = {
+        "optionSymbols": [
+            {
+                "symbol": "ETH-260726-1860-C",
+                "underlying": "ETHUSDT",
+                "status": "TRADING",
+                "strikePrice": "1860",
+                "side": "CALL",
+                "expiryDate": 1785052800000,
+                "unit": "1",
+            },
+            {
+                "symbol": "BTC-260726-100000-C",
+                "underlying": "BTCUSDT",
+                "status": "TRADING",
+                "strikePrice": "100000",
+                "side": "CALL",
+                "expiryDate": 1785052800000,
+                "unit": "1",
+            },
+        ]
+    }
+    rows = BinanceRestClient.fetch_option_instruments(cli, "ETH-USD_UM")
+    assert len(rows) == 1
+    assert rows[0]["symbol"] == "ETH-260726-1860-C"