修正滑点成交后的持仓估值

crates/fidc-core/src/broker.rs

@@ -31,6 +31,7 @@ pub struct BrokerExecutionReport {
 #[derive(Debug, Clone, Copy)]
 struct ExecutionLeg {
     price: f64,
+    mark_price: f64,
     quantity: u32,
 }
 
@@ -401,19 +402,37 @@ where
         side: OrderSide,
         quantity: Option<u32>,
     ) -> f64 {
-        let raw_price = if self.execution_price_field == PriceField::Last
+        let raw_price = self.snapshot_raw_execution_price(snapshot, side);
+        self.apply_slippage(snapshot, side, raw_price, quantity)
+    }
+
+    fn snapshot_raw_execution_price(
+        &self,
+        snapshot: &crate::data::DailyMarketSnapshot,
+        side: OrderSide,
+    ) -> f64 {
+        if self.execution_price_field == PriceField::Last
             && self.intraday_execution_start_time.is_some()
         {
-            let _ = side;
-            snapshot.price(PriceField::Last)
-        } else {
-            match side {
-                OrderSide::Buy => self.buy_price(snapshot),
-                OrderSide::Sell => self.sell_price(snapshot),
-            }
-        };
+            return snapshot.price(PriceField::Last);
+        }
+        match side {
+            OrderSide::Buy => self.buy_price(snapshot),
+            OrderSide::Sell => self.sell_price(snapshot),
+        }
+    }
 
-        self.apply_slippage(snapshot, side, raw_price, quantity)
+    fn snapshot_mark_price(
+        &self,
+        snapshot: &crate::data::DailyMarketSnapshot,
+        side: OrderSide,
+    ) -> f64 {
+        let price = snapshot.price(self.execution_price_field);
+        if price.is_finite() && price > 0.0 {
+            price
+        } else {
+            self.snapshot_raw_execution_price(snapshot, side)
+        }
     }
 
     fn is_open_auction_matching(&self) -> bool {
@@ -573,6 +592,14 @@ where
         }
     }
 
+    fn quote_mark_price(&self, quote: &IntradayExecutionQuote, fallback: f64) -> f64 {
+        if quote.last_price.is_finite() && quote.last_price > 0.0 {
+            quote.last_price
+        } else {
+            fallback
+        }
+    }
+
     pub fn execute(
         &self,
         date: NaiveDate,
@@ -2503,6 +2530,7 @@ where
                     fillable_qty,
                     vec![ExecutionLeg {
                         price: execution_price,
+                        mark_price: self.snapshot_mark_price(snapshot, OrderSide::Sell),
                         quantity: fillable_qty,
                     }],
                 )
@@ -2588,7 +2616,7 @@ where
             let net_cash = gross_amount - cost.total();
             let realized_pnl = portfolio
                 .position_mut(symbol)
-                .sell(leg.quantity, leg.price)
+                .sell_with_mark_price(leg.quantity, leg.price, leg.mark_price)
                 .map_err(BacktestError::Execution)?;
             if let Some(position) = portfolio.position_mut_if_exists(symbol) {
                 position.record_trade_cost(cost.total());
@@ -3909,6 +3937,7 @@ where
                     filled_qty,
                     vec![ExecutionLeg {
                         price: execution_price,
+                        mark_price: self.snapshot_mark_price(snapshot, OrderSide::Buy),
                         quantity: filled_qty,
                     }],
                 )
@@ -3995,9 +4024,12 @@ where
             let cash_out = gross_amount + cost.total();
 
             portfolio.apply_cash_delta(-cash_out);
-            portfolio
-                .position_mut(symbol)
-                .buy(date, leg.quantity, leg.price);
+            portfolio.position_mut(symbol).buy_with_mark_price(
+                date,
+                leg.quantity,
+                leg.price,
+                leg.mark_price,
+            );
             if let Some(position) = portfolio.position_mut_if_exists(symbol) {
                 position.record_buy_trade_cost(leg.quantity, cost.total());
             }
@@ -4700,6 +4732,7 @@ where
         };
         let mut filled_qty = 0_u32;
         let mut gross_amount = 0.0_f64;
+        let mut mark_amount = 0.0_f64;
         let mut last_timestamp = None;
         let mut legs = Vec::new();
         let mut budget_block_reason = None;
@@ -4717,6 +4750,7 @@ where
             else {
                 continue;
             };
+            let mark_price = self.quote_mark_price(quote, raw_quote_price);
             let remaining_qty = requested_qty.saturating_sub(filled_qty);
             if remaining_qty == 0 {
                 break;
@@ -4815,10 +4849,12 @@ where
             quote_price = self.execution_price_with_limit_slippage(quote_price, limit_price);
 
             gross_amount += quote_price * take_qty as f64;
+            mark_amount += mark_price * take_qty as f64;
             filled_qty += take_qty;
             last_timestamp = Some(quote.timestamp);
             legs.push(ExecutionLeg {
                 price: quote_price,
+                mark_price,
                 quantity: take_qty,
             });
 
@@ -4849,6 +4885,7 @@ where
             legs: if matching_type == MatchingType::Vwap {
                 vec![ExecutionLeg {
                     price: gross_amount / filled_qty as f64,
+                    mark_price: mark_amount / filled_qty as f64,
                     quantity: filled_qty,
                 }]
             } else {

crates/fidc-core/src/portfolio.rs

@@ -66,6 +66,16 @@ impl Position {
     }
 
     pub fn buy(&mut self, date: NaiveDate, quantity: u32, price: f64) {
+        self.buy_with_mark_price(date, quantity, price, price);
+    }
+
+    pub fn buy_with_mark_price(
+        &mut self,
+        date: NaiveDate,
+        quantity: u32,
+        execution_price: f64,
+        mark_price: f64,
+    ) {
         if quantity == 0 {
             return;
         }
@@ -73,19 +83,28 @@ impl Position {
         self.lots.push(PositionLot {
             acquired_date: date,
             quantity,
-            entry_price: price,
-            price,
+            entry_price: execution_price,
+            price: execution_price,
         });
         self.quantity += quantity;
-        self.last_price = price;
+        self.last_price = normalized_mark_price(mark_price, execution_price);
         self.day_trade_quantity_delta += quantity as i32;
         self.day_buy_quantity += quantity;
-        self.day_buy_value += price * quantity as f64;
+        self.day_buy_value += execution_price * quantity as f64;
         self.recalculate_average_cost();
         self.refresh_day_pnl();
     }
 
     pub fn sell(&mut self, quantity: u32, price: f64) -> Result<f64, String> {
+        self.sell_with_mark_price(quantity, price, price)
+    }
+
+    pub fn sell_with_mark_price(
+        &mut self,
+        quantity: u32,
+        execution_price: f64,
+        mark_price: f64,
+    ) -> Result<f64, String> {
         if quantity > self.quantity {
             return Err(format!(
                 "sell quantity {} exceeds current quantity {} for {}",
@@ -102,7 +121,7 @@ impl Position {
             };
 
             let lot_sell = remaining.min(first_lot.quantity);
-            realized += (price - first_lot.price) * lot_sell as f64;
+            realized += (execution_price - first_lot.price) * lot_sell as f64;
             first_lot.quantity -= lot_sell;
             remaining -= lot_sell;
 
@@ -112,11 +131,11 @@ impl Position {
         }
 
         self.quantity -= quantity;
-        self.last_price = price;
+        self.last_price = normalized_mark_price(mark_price, execution_price);
         self.realized_pnl += realized;
         self.day_trade_quantity_delta -= quantity as i32;
         self.day_sell_quantity += quantity;
-        self.day_sell_value += price * quantity as f64;
+        self.day_sell_value += execution_price * quantity as f64;
         self.recalculate_average_cost();
         self.refresh_day_pnl();
         Ok(realized)
@@ -356,6 +375,14 @@ impl Position {
     }
 }
 
+fn normalized_mark_price(mark_price: f64, fallback: f64) -> f64 {
+    if mark_price.is_finite() && mark_price > 0.0 {
+        mark_price
+    } else {
+        fallback
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct PortfolioState {
     initial_cash: f64,

crates/fidc-core/tests/explicit_order_flow.rs

@@ -1701,6 +1701,9 @@ fn broker_applies_tick_size_slippage_on_intraday_last_fills() {
 
     assert_eq!(report.fill_events.len(), 1);
     assert!((report.fill_events[0].price - 10.02).abs() < 1e-9);
+    let position = portfolio.position("000002.SZ").expect("position");
+    assert!((position.last_price - 10.0).abs() < 1e-9);
+    assert!((position.market_value() - position.quantity as f64 * 10.0).abs() < 1e-6);
 }
 
 #[test]