统一策略成交保护与锁定周期并修正日期条件覆盖

crates/fidc-core/src/portfolio.rs

@@ -60,6 +60,8 @@ pub struct PositionLot {
 pub struct Position {
     pub symbol: String,
     pub quantity: u32,
+    opened_date: Option<NaiveDate>,
+    last_buy_date: Option<NaiveDate>,
     // ALV-compatible moving average execution price; partial sells do not rebase it.
     pub average_price: f64,
     // ALV-compatible moving average including buy costs; partial sells do not rebase it.
@@ -88,6 +90,8 @@ impl Position {
         Self {
             symbol: symbol.into(),
             quantity: 0,
+            opened_date: None,
+            last_buy_date: None,
             average_price: 0.0,
             average_cost: 0.0,
             last_price: 0.0,
@@ -114,6 +118,12 @@ impl Position {
         self.quantity == 0
     }
 
+    pub fn opened_date(&self) -> Option<NaiveDate> {
+        self.opened_date
+    }
+
+    pub fn last_buy_date(&self) -> Option<NaiveDate> { self.last_buy_date }
+
     pub fn buy(&mut self, date: NaiveDate, quantity: u32, price: f64) {
         self.buy_with_mark_price(date, quantity, price, price);
     }
@@ -130,6 +140,10 @@ impl Position {
         }
 
         let previous_quantity = self.quantity;
+        self.last_buy_date = Some(self.last_buy_date.map_or(date, |previous| previous.max(date)));
+        if previous_quantity == 0 {
+            self.opened_date = Some(date);
+        }
         let previous_average_price = self.average_price;
         let previous_average_cost = self.average_cost;
         let gross_amount = fixed_money_or_panic(
@@ -267,6 +281,7 @@ impl Position {
             .checked_add(total_proceeds)
             .ok_or_else(|| "fixed-point day sell value overflow".to_string())?;
         if self.quantity == 0 {
+            self.opened_date = None;
             self.average_price = 0.0;
             self.recalculate_average_cost();
         } else {
@@ -1224,6 +1239,8 @@ impl PortfolioState {
         }
 
         let old_quantity = old_position.quantity;
+        let old_opened_date = old_position.opened_date;
+        let old_last_buy_date = old_position.last_buy_date;
         let last_price = old_position.last_price;
         let old_average_price = old_position.average_price;
         let old_average_cost = old_position.average_cost;
@@ -1263,6 +1280,14 @@ impl PortfolioState {
             .entry(new_symbol.to_string())
             .or_insert_with(|| Position::new(new_symbol));
         let successor_quantity_before = successor.quantity;
+        successor.opened_date = match (successor.opened_date, old_opened_date) {
+            (Some(current), Some(previous)) => Some(current.min(previous)),
+            (current, previous) => current.or(previous),
+        };
+        successor.last_buy_date = match (successor.last_buy_date, old_last_buy_date) {
+            (Some(current), Some(previous)) => Some(current.max(previous)),
+            (current, previous) => current.or(previous),
+        };
         let successor_average_price_before = successor.average_price;
         let successor_average_cost_before = successor.average_cost;
         successor.lots.extend(converted_lots);