fix: validate historical trade chain changes

src/grid_trading/services/trading_service.py

@@ -143,6 +143,15 @@ class TradingService:
         return self.save_trade(trade)
 
     def delete_trade(self, trade_id: int) -> None:
+        trade = self.repository.get_trade(trade_id)
+        if trade is None:
+            return
+        remaining_trades = [
+            existing
+            for existing in self.repository.list_trades(account_id=trade.account_id)
+            if existing.id != trade_id
+        ]
+        self._validate_trade_chain(remaining_trades)
         self.repository.delete_trade(trade_id)
 
     def list_trades(self, *, instrument_id: int | None = None) -> list[Trade]:
@@ -216,15 +225,21 @@ class TradingService:
             )
 
     def _validate_resulting_position(self, trade: Trade, existing_trades: list[Trade]) -> None:
+        self._validate_trade_chain([*existing_trades, trade])
+
+    def _validate_trade_chain(self, trades: list[Trade]) -> None:
+        if not trades:
+            return
         instruments = self.repository.list_instruments()
+        as_of = max(item.trade_date for item in trades)
         try:
             calculate_positions(
                 instruments,
-                [*existing_trades, trade],
-                as_of=trade.trade_date,
+                trades,
+                as_of=as_of,
             )
         except CalculationError as exc:
-            raise ValueError(str(exc)) from exc
+            raise ValueError(f"后续成交重算失败：{exc}") from exc
 
     def _instrument_cashflows(self, account_id: int) -> dict[int, Decimal]:
         totals: dict[int, Decimal] = defaultdict(lambda: Decimal("0"))