Add Binance live trading, anti-stuck open/close recovery, and configurable rate limits.

OKX/Binance LIVE share half_open and option_closed_perp_pending repair paths; private REST throttles default to 1s and are tunable in settings.

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

backend/app/live/okx_trade.py

@@ -15,6 +15,7 @@ import httpx
 
 from ..config import Settings, get_settings
 from ..exchange.okx.parse import safe_float
+from .rate_limit import RateLimitError, get_throttle, parse_retry_after_header
 
 logger = logging.getLogger(__name__)
 
@@ -41,6 +42,7 @@ class OkxTradeClient:
             headers={"Accept": "application/json", "User-Agent": "eth-hedge-live/0.1"},
         )
         self._ct_val_cache: dict[str, float] = {}
+        self._throttle = get_throttle("okx_trade", min_interval_sec=1.0)
 
     def close(self) -> None:
         self._client.close()
@@ -70,6 +72,7 @@ class OkxTradeClient:
     def _request(
         self, method: str, path: str, body: dict[str, Any] | None = None
     ) -> list[dict[str, Any]]:
+        self._throttle.before_request()
         payload = "" if body is None else json.dumps(body, separators=(",", ":"))
         ts = self._ts()
         sign = self._sign(ts, method, path, payload)
@@ -78,11 +81,31 @@ class OkxTradeClient:
             r = self._client.get(path, headers=headers)
         else:
             r = self._client.request(method.upper(), path, content=payload, headers=headers)
-        r.raise_for_status()
+        if r.status_code in (418, 429):
+            ra = parse_retry_after_header(r.headers)
+            self._throttle.mark_http(r.status_code, ra)
+            raise RateLimitError(
+                f"OKX HTTP {r.status_code}: {r.text[:200]}",
+                retry_after=self._throttle.remaining_cooldown(),
+            )
+        try:
+            r.raise_for_status()
+        except httpx.HTTPStatusError as e:
+            raise RuntimeError(f"OKX HTTP {r.status_code}: {r.text[:300]}") from e
         data = r.json()
-        if str(data.get("code")) != "0":
+        code = str(data.get("code") or "")
+        msg = str(data.get("msg") or "")
+        # OKX 业务层频率类错误
+        if code != "0":
+            low = f"{code} {msg}".lower()
+            if code in ("50011", "50061") or "too many" in low or "频率" in msg:
+                self._throttle.mark_seconds(20.0)
+                raise RateLimitError(
+                    f"OKX trade rate-limited code={code} msg={msg}",
+                    retry_after=self._throttle.remaining_cooldown(),
+                )
             raise RuntimeError(
-                f"OKX trade error code={data.get('code')} msg={data.get('msg')} data={data.get('data')}"
+                f"OKX trade error code={code} msg={msg} data={data.get('data')}"
             )
         rows = data.get("data") or []
         return [x for x in rows if isinstance(x, dict)]