fix: persist uncertain cancel outcomes

trex_core/domain/slot/service.py

@@ -205,6 +205,8 @@ class SlotService:
                 timeout_sec=None,
                 slippage_pct=None,
                 venue="KRX",
+                cancel_state=None,
+                cancel_requested_at=None,
                 updated_at=datetime.now(tz=timezone.utc),
             )
 
@@ -277,6 +279,8 @@ class SlotService:
             slippage_pct=new_slippage_pct,
             occupancy_seq=new_occupancy_seq,
             venue=new_venue,
+            cancel_state=None,
+            cancel_requested_at=None,
             updated_at=datetime.now(tz=timezone.utc),
         )