Add weekend open skip, expiry force-close, and Chinese trade labels.

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

backend/app/api/sim.py

@@ -5,11 +5,12 @@ from typing import Annotated
 from fastapi import APIRouter, Depends, HTTPException
 from pydantic import BaseModel, Field
 
+from ..config import get_settings
 from ..market import get_gateway
 from ..models.db import get_db
 from ..sim.ledger import Ledger
 from ..sim.matcher import Matcher
-from ..strategy.clock import window_key
+from ..strategy.clock import can_open_new, window_key
 from ..strategy.group import next_group_id
 from .auth import require_user
 
@@ -39,6 +40,13 @@ async def sim_open_group(
 ) -> dict:
     if Matcher().has_open_position():
         raise HTTPException(status_code=409, detail="有未平仓，禁止开下一组")
+    s = get_settings()
+    skip_weekends = Ledger().get_setting_bool("skip_weekends", s.skip_weekends)
+    if not can_open_new(skip_weekends=skip_weekends):
+        raise HTTPException(
+            status_code=409,
+            detail="周六/周日跳过开仓（上海时区）",
+        )
     gw = get_gateway()
     pick = await gw.pick_for_open_async()
     if pick is None:
@@ -53,12 +61,9 @@ async def sim_open_group(
         perp_side = "short" if force == "call" else "long"
         bias = "manual_" + force
         option_ask = pick.call_ask if force == "call" else pick.put_ask
-        from ..config import get_settings
         from ..strategy.selection import option_leverage
-        from ..sim.ledger import Ledger as Led
 
-        s = get_settings()
-        min_lev = Led().get_setting_float("min_option_leverage", s.min_option_leverage)
+        min_lev = Ledger().get_setting_float("min_option_leverage", s.min_option_leverage)
         lev = option_leverage(pick.underlying_px, option_ask)
         if lev is None or lev < min_lev:
             raise HTTPException(