feat: persist skipped ledger fills

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

trex_core/adapters/broker/paper.py

@@ -8,9 +8,8 @@ execution code path that production (KIS) takes.
 from __future__ import annotations
 
 import threading
+from datetime import UTC, datetime
 from decimal import Decimal
-from datetime import datetime
-from typing import Optional
 
 from trex_core.adapters.broker.seq_store import SeqStore
 from trex_core.application.broker_port import (
@@ -52,9 +51,9 @@ class PaperBroker:
         self,
         *,
         fill_after_polls: int = 0,
-        qty_per_poll: Optional[int] = None,
-        reject_symbols: Optional[set[str]] = None,
-        seq_store: Optional[SeqStore] = None,
+        qty_per_poll: int | None = None,
+        reject_symbols: set[str] | None = None,
+        seq_store: SeqStore | None = None,
     ) -> None:
         self._fill_after = fill_after_polls
         self._qty_per_poll = qty_per_poll
@@ -90,8 +89,8 @@ class PaperBroker:
         *,
         side: str,
         symbol: str,
-        order_date: Optional[str] = None,
-        submitted_at: Optional[datetime] = None,
+        order_date: str | None = None,
+        submitted_at: datetime | None = None,
     ) -> FillStatus:
         with self._lock:
             o = self._orders.get(broker_order_id)
@@ -122,6 +121,7 @@ class PaperBroker:
                     state="filled", filled_qty=o.filled, avg_price=o.price,
                     execution_id=execution_id, fee=fee, tax=tax,
                     execution_venue=o.execution_venue,
+                    executed_at=datetime.now(tz=UTC),
                 )
             return FillStatus(
                 state="partially_filled",
@@ -172,7 +172,7 @@ class PaperBroker:
         with self._lock:
             self._prices[symbol] = Decimal(str(price))
 
-    def get_current_price(self, symbol: str, market: str = "J") -> Optional[Decimal]:
+    def get_current_price(self, symbol: str, market: str = "J") -> Decimal | None:
         """Return the programmed current price for symbol, or None if unset.
 
         market accepted for BrokerPort protocol conformance (REQ-118) but