Add Binance SIM market adapter and exchange switch in settings.

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

backend/app/exchange/okx/parse.py

@@ -6,8 +6,17 @@ import re
 from datetime import datetime, timezone
 from typing import Any
 
+from ..expiry import expiry_ms_from_ymd
+
 _DATE_RE = re.compile(r"^\d{6}$")
 
+__all__ = [
+    "expiry_ms_from_ymd",
+    "parse_option_inst_id",
+    "rows_to_option_contracts",
+    "safe_float",
+]
+
 
 def safe_float(v: Any) -> float | None:
     if v is None or v == "":
@@ -31,13 +40,6 @@ def parse_option_inst_id(inst_id: str) -> tuple[str | None, float | None, str |
     return ymd, strike, opt
 
 
-def expiry_ms_from_ymd(ymd: str) -> int:
-    """OKX 期权到期：当日 08:00 UTC = 上海 16:00。"""
-    yy, mm, dd = int(ymd[0:2]), int(ymd[2:4]), int(ymd[4:6])
-    dt = datetime(2000 + yy, mm, dd, 8, 0, 0, tzinfo=timezone.utc)
-    return int(dt.timestamp() * 1000)
-
-
 def rows_to_option_contracts(rows: list[dict[str, Any]]) -> list[dict[str, Any]]:
     """
     归一化为策略层可用的中性结构：
@@ -52,22 +54,26 @@ def rows_to_option_contracts(rows: list[dict[str, Any]]) -> list[dict[str, Any]]
             continue
         inst_id = str(row.get("instId") or "")
         y, stk, opt = parse_option_inst_id(inst_id)
+        exp_ms = None
         if y is None or stk is None or opt is None:
             exp = safe_float(row.get("expTime"))
             if exp:
                 ms = int(exp) if exp > 10_000_000_000 else int(exp * 1000)
                 y = datetime.fromtimestamp(ms / 1000, tz=timezone.utc).strftime("%y%m%d")
+                exp_ms = ms
             stk = safe_float(row.get("stk"))
             opt_raw = str(row.get("optType") or "").upper()
             opt = opt_raw if opt_raw in ("C", "P") else None
         if not inst_id or not y or stk is None or opt not in ("C", "P"):
             continue
+        if exp_ms is None:
+            exp_ms = expiry_ms_from_ymd(y)
         ct = safe_float(row.get("ctMult"))
         out.append(
             {
                 "inst_id": inst_id,
                 "expiry_ymd": y,
-                "expiry_ms": expiry_ms_from_ymd(y),
+                "expiry_ms": int(exp_ms),
                 "strike": float(stk),
                 "side": opt,
                 "ct_mult": float(ct) if ct and ct > 0 else None,