Gate one-open-per-expiry by historical expiry_ymd across days.

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

backend/app/strategy/session.py

@@ -72,13 +72,13 @@ def _as_bool_setting(raw: str | None, default: bool) -> bool:
 def _skip_expiry_ymds_for_next() -> set[str]:
     """
     空仓选约/监控应跳过的到期日：
-    - 当日已开过（one_expiry_per_day）
+    - 历史上已开过该到期（one_expiry_per_day，跨日）
     - 仍有待结算残留期权的到期档（该档已「完成」开平，盯下一档）
     """
     skip: set[str] = set()
     try:
         from ..models.db import get_db
-        from .clock import pending_residual_expiry_ymds, used_expiry_ymds_for_day
+        from .clock import pending_residual_expiry_ymds, used_expiry_ymds
 
         s = get_settings()
         db = get_db()
@@ -87,7 +87,7 @@ def _skip_expiry_ymds_for_next() -> set[str]:
             s.one_expiry_per_day,
         )
         if one_exp_day:
-            skip |= used_expiry_ymds_for_day(db)
+            skip |= used_expiry_ymds(db)
         skip |= pending_residual_expiry_ymds(db)
     except Exception:
         logger.exception("skip-expiry lookup failed; continue without skip")