Fix PriceResult slots serialization that broke open-group response.

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

backend/app/sim/matcher.py

@@ -213,8 +213,8 @@ class Matcher:
             detail="opened",
             data={
                 "group_id": group_id,
-                "perp": pf.__dict__,
-                "option": of.__dict__,
+                "perp": pf.to_dict(),
+                "option": of.to_dict(),
                 "initial_premium": initial_premium,
                 "fees": pf.fee + of.fee,
             },

backend/app/sim/pricing.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from dataclasses import dataclass
+from dataclasses import asdict, dataclass
 
 
 @dataclass(slots=True)
@@ -13,6 +13,9 @@ class PriceResult:
     slip: float
     notional: float
 
+    def to_dict(self) -> dict[str, float]:
+        return asdict(self)
+
 
 def perp_fill(
     *,

backend/app/strategy/engine.py

@@ -82,7 +82,15 @@ class StrategyEngine:
             r = self.matcher.close_group(reason="emergency")
             if r.ok:
                 self._after_close()
-            return {"close": r.__dict__, "state": self.state()}
+            return {
+                "close": {
+                    "ok": r.ok,
+                    "detail": r.detail,
+                    "liquidity_wait": r.liquidity_wait,
+                    "data": r.data,
+                },
+                "state": self.state(),
+            }
 
     def _after_close(self) -> None:
         s = get_settings()
@@ -147,7 +155,7 @@ class StrategyEngine:
 
         # 有仓：盯平仓
         if pos.get("status") == "open":
-            self._set_state(phase="open")
+            self._set_state(phase="open", last_error=None)
             upl = self.matcher.unrealized()
             decision = check_exits(
                 perp_upl=float(upl["perp_upl"]),