merge: integrate causal capacity model with current order clocks and intent planning

crates/fidc-core/src/broker.rs

@@ -7,7 +7,7 @@ use chrono::{Duration, NaiveDate, NaiveDateTime, NaiveTime};
 use crate::cost::CostModel;
 use crate::data::{DataSet, IntradayExecutionQuote, PriceField};
 use crate::engine::BacktestError;
-use crate::execution_capacity::{CapacityError, ParticipationRate, VolumeObservation, VolumeObservationKind};
+use crate::execution_capacity::{CapacityAuditSummary, CapacityError, ParticipationRate, SessionCapacityAudit, VolumeCapacityMode, VolumeObservation, VolumeObservationKind};
 use crate::execution_schedule::TwapSchedule;
 use crate::events::{
     AccountEvent, FillEvent, OrderEvent, OrderSide, OrderStatus, PositionEvent, ProcessEvent,
@@ -204,6 +204,8 @@ struct OpenOrder {
     order_id: u64,
     decision_date: Option<NaiveDate>,
     order_created_date: Option<NaiveDate>,
+    submission_time: Option<NaiveTime>,
+    accepted_date: NaiveDate,
     symbol: String,
     side: OrderSide,
     requested_quantity: u32,
@@ -216,6 +218,13 @@ struct OpenOrder {
     reason: String,
 }
 
+#[derive(Debug, Clone, Copy)]
+struct RestingOrderOrigin {
+    created_date: Option<NaiveDate>,
+    submission_time: Option<NaiveTime>,
+    accepted_date: NaiveDate,
+}
+
 #[derive(Debug, Default)]
 struct BrokerExecutionSession {
     date: Option<NaiveDate>,
@@ -423,6 +432,7 @@ pub struct BrokerSimulator<C, R> {
     volume_percent: f64,
     volume_rate: Result<ParticipationRate, CapacityError>,
     volume_limit: bool,
+    volume_capacity_mode: VolumeCapacityMode,
     inactive_limit: bool,
     liquidity_limit: bool,
     strict_value_budget: bool,
@@ -439,6 +449,7 @@ pub struct BrokerSimulator<C, R> {
     runtime_auto_buy_denials: RefCell<BTreeMap<String, String>>,
     runtime_auto_sell_denials: RefCell<BTreeMap<String, String>>,
     runtime_order_created_date: Cell<Option<NaiveDate>>,
+    runtime_resting_order_origin: Cell<Option<RestingOrderOrigin>>,
     runtime_decision_total_equity: Cell<Option<f64>>,
     runtime_target_position_limit: Cell<Option<usize>>,
     runtime_time_in_force: Cell<Option<OrderTimeInForce>>,
@@ -459,6 +470,7 @@ impl<C, R> BrokerSimulator<C, R> {
             volume_percent: 0.25,
             volume_rate: ParticipationRate::new(0.25),
             volume_limit: true,
+            volume_capacity_mode: VolumeCapacityMode::ExecutionObservation,
             inactive_limit: true,
             liquidity_limit: true,
             strict_value_budget: true,
@@ -475,6 +487,7 @@ impl<C, R> BrokerSimulator<C, R> {
             runtime_auto_buy_denials: RefCell::new(BTreeMap::new()),
             runtime_auto_sell_denials: RefCell::new(BTreeMap::new()),
             runtime_order_created_date: Cell::new(None),
+            runtime_resting_order_origin: Cell::new(None),
             runtime_decision_total_equity: Cell::new(None),
             runtime_target_position_limit: Cell::new(None),
             runtime_time_in_force: Cell::new(None),
@@ -499,6 +512,7 @@ impl<C, R> BrokerSimulator<C, R> {
             volume_percent: 0.25,
             volume_rate: ParticipationRate::new(0.25),
             volume_limit: true,
+            volume_capacity_mode: VolumeCapacityMode::ExecutionObservation,
             inactive_limit: true,
             liquidity_limit: true,
             strict_value_budget: true,
@@ -515,6 +529,7 @@ impl<C, R> BrokerSimulator<C, R> {
             runtime_auto_buy_denials: RefCell::new(BTreeMap::new()),
             runtime_auto_sell_denials: RefCell::new(BTreeMap::new()),
             runtime_order_created_date: Cell::new(None),
+            runtime_resting_order_origin: Cell::new(None),
             runtime_decision_total_equity: Cell::new(None),
             runtime_target_position_limit: Cell::new(None),
             runtime_time_in_force: Cell::new(None),
@@ -529,6 +544,29 @@ impl<C, R> BrokerSimulator<C, R> {
         self
     }
 
+    pub fn with_volume_capacity_mode(mut self, mode: VolumeCapacityMode) -> Self {
+        self.volume_capacity_mode = mode;
+        self
+    }
+
+    pub fn capacity_audit_summary(&self) -> CapacityAuditSummary {
+        CapacityAuditSummary { mode: self.volume_capacity_mode, enabled: self.volume_limit,
+            participation_rate: self.volume_percent, ..Default::default() }
+    }
+
+    pub fn audit_completed_session_capacity(&self, date: NaiveDate, data: &DataSet) -> Result<Vec<SessionCapacityAudit>, BacktestError> {
+        if !self.volume_limit || self.volume_capacity_mode != VolumeCapacityMode::SessionCapacityAudit {
+            return Ok(Vec::new());
+        }
+        let session = self.execution_session.borrow();
+        if session.date != Some(date) { return Ok(Vec::new()); }
+        let rate = self.volume_rate.map_err(|error| BacktestError::Execution(error.to_string()))?;
+        session.intraday_turnover.iter().filter(|(_, quantity)| **quantity > 0).map(|(symbol, quantity)| {
+            let market = data.market(date, symbol).ok_or_else(|| BacktestError::MissingPrice { date, symbol: symbol.clone(), field: "session capacity audit" })?;
+            Ok(SessionCapacityAudit::new(date, symbol.clone(), u64::from(*quantity), market.volume, rate))
+        }).collect()
+    }
+
     pub fn with_inactive_limit(mut self, enabled: bool) -> Self {
         self.inactive_limit = enabled;
         self
@@ -636,6 +674,23 @@ impl<C, R> BrokerSimulator<C, R> {
             .or(self.intraday_execution_start_time)
     }
 
+    fn order_origin(&self) -> (Option<NaiveDate>, Option<NaiveTime>) {
+        self.runtime_resting_order_origin.get().map_or(
+            (self.runtime_order_created_date.get(), self.submission_time()),
+            |origin| (origin.created_date, origin.submission_time),
+        )
+    }
+
+    fn accepted_order_date(&self, date: NaiveDate) -> NaiveDate {
+        self.runtime_resting_order_origin.get().map_or(date, |origin| origin.accepted_date)
+    }
+
+    fn resting_daily_open_order(&self) -> bool {
+        self.runtime_resting_order_origin.get().is_some()
+            && self.runtime_intraday_start_time.get().is_some()
+            && self.matching_type == MatchingType::NextBarOpen
+    }
+
     fn execution_phase_for_submission(
         &self,
         date: NaiveDate,
@@ -661,10 +716,11 @@ impl<C, R> BrokerSimulator<C, R> {
     }
 
     fn execution_phase(&self, date: NaiveDate) -> EquityExecutionPhase {
+        let origin = self.order_origin();
         self.execution_phase_for_submission(
             date,
-            self.runtime_order_created_date.get(),
-            self.submission_time(),
+            origin.0,
+            origin.1,
         )
     }
 
@@ -675,6 +731,8 @@ impl<C, R> BrokerSimulator<C, R> {
     fn effective_execution_price_field(&self, date: NaiveDate) -> PriceField {
         if self.is_post_close_fixed_price(date) {
             PriceField::Close
+        } else if self.resting_daily_open_order() {
+            PriceField::Last
         } else {
             self.execution_price_field
         }
@@ -684,10 +742,11 @@ impl<C, R> BrokerSimulator<C, R> {
         &self,
         date: NaiveDate,
     ) -> Option<(NaiveDateTime, NaiveDateTime)> {
+        let origin = self.order_origin();
         self.post_close_execution_quote_window_for_submission(
             date,
-            self.runtime_order_created_date.get(),
-            self.submission_time(),
+            origin.0,
+            origin.1,
         )
         .map(|(start, end)| (date.and_time(start), date.and_time(end)))
     }
@@ -730,7 +789,8 @@ impl<C, R> BrokerSimulator<C, R> {
         if self.is_post_close_fixed_price(date) {
             return match self.runtime_time_in_force.get() {
                 Some(OrderTimeInForce::Fok) => RemainderPolicy::FillOrKill,
-                _ => RemainderPolicy::Cancel,
+                Some(OrderTimeInForce::Ioc | OrderTimeInForce::Gtc) => RemainderPolicy::Cancel,
+                _ => RemainderPolicy::KeepUntilClose,
             };
         }
         match self.runtime_time_in_force.get() {
@@ -781,7 +841,7 @@ impl<C, R> BrokerSimulator<C, R> {
                 filled_quantity: order.filled_quantity,
                 remaining_quantity: order.remaining_quantity,
                 unfilled_quantity: order.remaining_quantity,
-                status: OrderStatus::Pending,
+                status: if order.filled_quantity > 0 { OrderStatus::PartiallyFilled } else { OrderStatus::Pending },
                 avg_price: 0.0,
                 transaction_cost: 0.0,
                 limit_price: order.limit_price,
@@ -793,6 +853,17 @@ impl<C, R> BrokerSimulator<C, R> {
     pub fn has_open_orders(&self) -> bool {
         !self.open_orders.borrow().is_empty()
     }
+
+    fn resting_order_session_close(&self, date: NaiveDate, order: &OpenOrder) -> NaiveTime {
+        let post_close = self.execution_phase_for_submission(date, order.order_created_date, order.submission_time)
+            == EquityExecutionPhase::PostCloseFixedPrice;
+        NaiveTime::from_hms_opt(15, if post_close { 30 } else { 0 }, 0).expect("session end")
+    }
+
+    pub(crate) fn next_day_order_expiry(&self, date: NaiveDate) -> Option<NaiveTime> {
+        self.open_orders.borrow().iter().filter(|order| order.time_in_force == OrderTimeInForce::Day)
+            .map(|order| self.resting_order_session_close(date, order)).min()
+    }
 }
 
 impl<C, R> BrokerSimulator<C, R>
@@ -1358,6 +1429,7 @@ where
         match algo_request.map(|request| request.style) {
             Some(AlgoExecutionStyle::Vwap) => MatchingType::Vwap,
             Some(AlgoExecutionStyle::Twap) => MatchingType::Twap,
+            None if self.resting_daily_open_order() => MatchingType::CurrentBarClose,
             None => self.matching_type,
         }
     }
@@ -2389,7 +2461,7 @@ where
     }
 
     fn current_order_created_date(&self, date: NaiveDate) -> NaiveDate {
-        self.runtime_order_created_date.get().unwrap_or(date)
+        self.order_origin().0.unwrap_or(date)
     }
 
     fn annotate_report_range(
@@ -2541,6 +2613,23 @@ where
             std::mem::take(&mut *open_orders)
         };
         for order in pending_orders {
+            if self.matching_type == MatchingType::NextBarOpen && self.runtime_intraday_start_time.get().is_none()
+                && order.accepted_date == date {
+                self.open_orders.borrow_mut().push(order);
+                continue;
+            }
+            let close = self.resting_order_session_close(date, &order);
+            let clock = self.submission_time();
+            let past_day = order.time_in_force == OrderTimeInForce::Day
+                && order.accepted_date < date;
+            if past_day || clock.is_some_and(|time| time > close) {
+                if order.time_in_force == OrderTimeInForce::Day {
+                    Self::emit_resting_day_expiry(report, date, &order, order.filled_quantity);
+                } else {
+                    self.open_orders.borrow_mut().push(order);
+                }
+                continue;
+            }
             let order_event_start = report.order_events.len();
             let fill_event_start = report.fill_events.len();
             if let Some(commission_remaining) = order.commission_remaining {
@@ -2565,6 +2654,12 @@ where
             let previous_time_in_force = self
                 .runtime_time_in_force
                 .replace(Some(order.time_in_force));
+            let previous_origin = self.runtime_resting_order_origin.replace(Some(RestingOrderOrigin {
+                created_date: order.order_created_date,
+                submission_time: order.submission_time,
+                accepted_date: order.accepted_date,
+            }));
+            let previous_decision_date = self.runtime_decision_date.replace(order.decision_date);
             let execution_result = self.process_limit_shares_internal(
                 date,
                 portfolio,
@@ -2582,6 +2677,8 @@ where
                 report,
             );
             self.runtime_time_in_force.set(previous_time_in_force);
+            self.runtime_resting_order_origin.set(previous_origin);
+            self.runtime_decision_date.set(previous_decision_date);
             execution_result?;
             let attempt_filled = report.fill_events[fill_event_start..]
                 .iter()
@@ -2600,6 +2697,8 @@ where
                     remains_open = remaining_quantity > 0;
                     reopened.decision_date = order.decision_date;
                     reopened.order_created_date = order.order_created_date;
+                    reopened.submission_time = order.submission_time;
+                    reopened.accepted_date = order.accepted_date;
                     reopened.requested_quantity = order.requested_quantity;
                     reopened.filled_quantity = cumulative_filled;
                     reopened.remaining_quantity = remaining_quantity;
@@ -2611,6 +2710,13 @@ where
                     open_orders.retain(|open| open.order_id != order.order_id);
                 }
             }
+            if remains_open && order.time_in_force == OrderTimeInForce::Day
+                && clock.is_some_and(|time| time >= close)
+            {
+                self.clear_open_order(order.order_id);
+                Self::emit_resting_day_expiry(report, date, &order, cumulative_filled);
+                remains_open = false;
+            }
             if report.order_events.len() == order_event_start && !remains_open {
                 report.order_events.push(OrderEvent {
                     date,
@@ -2666,6 +2772,18 @@ where
         Ok(())
     }
 
+    fn emit_resting_day_expiry(report: &mut BrokerExecutionReport, date: NaiveDate, order: &OpenOrder, filled: u32) {
+        let detail = format!("DAY order expired at market close: {} remaining_quantity={}", order.symbol, order.requested_quantity.saturating_sub(filled));
+        report.order_events.push(OrderEvent {
+            date, decision_date: order.decision_date, order_created_date: order.order_created_date,
+            execution_date: Some(date), order_id: Some(order.order_id), symbol: order.symbol.clone(),
+            side: order.side, requested_quantity: order.requested_quantity, filled_quantity: filled,
+            status: OrderStatus::Expired, reason: detail.clone(),
+        });
+        Self::emit_order_process_event(report, date, ProcessEventKind::OrderUnsolicitedUpdate,
+            order.order_id, &order.symbol, order.side, format!("status=Expired reason={detail}"));
+    }
+
     fn cancel_open_order(
         &self,
         date: NaiveDate,
@@ -3495,8 +3613,6 @@ where
                     data,
                     &symbol,
                     current_qty,
-                    minimum_order_quantity,
-                    order_step_size,
                 )
             {
                 diagnostics.push(format!(
@@ -3513,8 +3629,6 @@ where
                     data,
                     &symbol,
                     current_qty,
-                    minimum_order_quantity,
-                    order_step_size,
                 )
             {
                 diagnostics.push(format!(
@@ -3925,8 +4039,6 @@ where
                 data,
                 symbol,
                 current_qty,
-                minimum_order_quantity,
-                order_step_size,
             ) else {
                 continue;
             };
@@ -3986,6 +4098,9 @@ where
         side: OrderSide,
         algo_request: Option<&AlgoExecutionRequest>,
     ) -> f64 {
+        if self.matching_type == MatchingType::NextBarOpen && !self.resting_daily_open_order() && algo_request.is_none() {
+            return self.execution_limit_check_price(snapshot, side);
+        }
         let matching_type = self.matching_type_for_algo_request(algo_request);
         let start_cursor = algo_request
             .and_then(|request| request.start_time)
@@ -4194,8 +4309,6 @@ where
         data: &DataSet,
         symbol: &str,
         current_qty: u32,
-        minimum_order_quantity: u32,
-        order_step_size: u32,
     ) -> Option<String> {
         if let Some(reason) = self.runtime_auto_sell_denials.borrow().get(symbol) {
             return Some(reason.clone());
@@ -4224,12 +4337,8 @@ where
             .saturating_sub(self.reserved_open_sell_quantity(symbol, None));
         match self.market_fillable_quantity(
             snapshot,
-            OrderSide::Sell,
             sellable.min(current_qty),
-            minimum_order_quantity,
-            order_step_size,
-            0,
-            sellable >= current_qty,
+            false,
         ) {
             Ok(quantity) => {
                 let quantity = quantity.min(sellable).min(current_qty);
@@ -4250,8 +4359,6 @@ where
         data: &DataSet,
         symbol: &str,
         current_qty: u32,
-        minimum_order_quantity: u32,
-        order_step_size: u32,
     ) -> Option<String> {
         let snapshot = data.require_market(date, symbol).ok()?;
         let candidate = data.require_candidate(date, symbol).ok()?;
@@ -4272,11 +4379,7 @@ where
         }
         match self.market_fillable_quantity(
             snapshot,
-            OrderSide::Buy,
             u32::MAX,
-            minimum_order_quantity,
-            order_step_size,
-            0,
             false,
         ) {
             Ok(quantity) => {
@@ -4391,6 +4494,7 @@ where
             );
             return Ok(());
         };
+        let limit_price = limit_price.or_else(|| self.is_post_close_fixed_price(date).then_some(snapshot.close));
         let Some(candidate) = data.candidate(date, symbol) else {
             Self::reject_unavailable_order(
                 report,
@@ -4545,14 +4649,12 @@ where
         } else {
             None
         };
+        self.volume_capacity_mode.validate(self.volume_limit, algo_request.is_some() || self.matching_type_uses_intraday_quotes())
+            .map_err(|error| BacktestError::Execution(error.to_string()))?;
         let market_limited_qty = self.market_fillable_quantity(
             snapshot,
-            OrderSide::Sell,
             requested_qty.min(sellable),
-            self.minimum_order_quantity(data, symbol),
-            self.order_step_size(data, symbol),
-            *intraday_turnover.get(symbol).unwrap_or(&0),
-            requested_qty >= position.quantity && sellable >= position.quantity,
+            algo_request.is_some(),
         );
         let fillable_qty = match market_limited_qty {
             Ok(quantity) => {
@@ -4582,6 +4684,8 @@ where
                 if Self::keeps_remainder_open(remainder_policy) {
                     self.upsert_open_order(OpenOrder {
                         order_id,
+                        submission_time: if self.matching_type == MatchingType::NextBarOpen { NaiveTime::from_hms_opt(9,30,0) } else { self.order_origin().1 },
+                        accepted_date: self.accepted_order_date(date),
                         decision_date: Some(self.current_decision_date(date)),
                         order_created_date: Some(self.current_order_created_date(date)),
                         symbol: symbol.to_string(),
@@ -4595,6 +4699,10 @@ where
                         execution_cursor: execution_cursors.get(symbol).copied(),
                         reason: reason.to_string(),
                     });
+                    // Waiting without a fill is not a new order-state transition.
+                    if !emit_creation_events {
+                        return Ok(());
+                    }
                     report.order_events.push(OrderEvent {
                         date,
                         decision_date: None,
@@ -4667,6 +4775,8 @@ where
                     .unwrap_or("no sellable quantity");
                 self.upsert_open_order(OpenOrder {
                     order_id,
+                    submission_time: if self.matching_type == MatchingType::NextBarOpen { NaiveTime::from_hms_opt(9,30,0) } else { self.order_origin().1 },
+                    accepted_date: self.accepted_order_date(date),
                     decision_date: Some(self.current_decision_date(date)),
                     order_created_date: Some(self.current_order_created_date(date)),
                     symbol: symbol.to_string(),
@@ -4680,6 +4790,10 @@ where
                     execution_cursor: execution_cursors.get(symbol).copied(),
                     reason: reason.to_string(),
                 });
+                // Waiting without a fill is not a new order-state transition.
+                if !emit_creation_events {
+                    return Ok(());
+                }
                 report.order_events.push(OrderEvent {
                     date,
                     decision_date: None,
@@ -4834,6 +4948,8 @@ where
             {
                 self.upsert_open_order(OpenOrder {
                     order_id,
+                    submission_time: if self.matching_type == MatchingType::NextBarOpen { NaiveTime::from_hms_opt(9,30,0) } else { self.order_origin().1 },
+                    accepted_date: self.accepted_order_date(date),
                     decision_date: Some(self.current_decision_date(date)),
                     order_created_date: Some(self.current_order_created_date(date)),
                     symbol: symbol.to_string(),
@@ -4847,6 +4963,10 @@ where
                     execution_cursor: execution_cursors.get(symbol).copied(),
                     reason: reason.to_string(),
                 });
+                // Waiting without a fill is not a new order-state transition.
+                if !emit_creation_events {
+                    return Ok(());
+                }
                 report.order_events.push(OrderEvent {
                     date,
                     decision_date: None,
@@ -5000,6 +5120,8 @@ where
         if keep_open {
             self.upsert_open_order(OpenOrder {
                 order_id,
+                submission_time: if self.matching_type == MatchingType::NextBarOpen { NaiveTime::from_hms_opt(9,30,0) } else { self.order_origin().1 },
+                accepted_date: self.accepted_order_date(date),
                 decision_date: Some(self.current_decision_date(date)),
                 order_created_date: Some(self.current_order_created_date(date)),
                 symbol: symbol.to_string(),
@@ -6197,6 +6319,7 @@ where
             );
             return Ok(());
         };
+        let limit_price = limit_price.or_else(|| self.is_post_close_fixed_price(date).then_some(snapshot.close));
         let Some(candidate) = data.candidate(date, symbol) else {
             Self::reject_unavailable_order(
                 report,
@@ -6354,14 +6477,12 @@ where
         }
 
         let mut partial_fill_reason = None;
+        self.volume_capacity_mode.validate(self.volume_limit, algo_request.is_some() || self.matching_type_uses_intraday_quotes())
+            .map_err(|error| BacktestError::Execution(error.to_string()))?;
         let market_limited_qty = self.market_fillable_quantity(
             snapshot,
-            OrderSide::Buy,
             requested_qty,
-            self.minimum_order_quantity(data, symbol),
-            self.order_step_size(data, symbol),
-            *intraday_turnover.get(symbol).unwrap_or(&0),
-            false,
+            algo_request.is_some(),
         );
         let constrained_qty = match market_limited_qty {
             Ok(quantity) => {
@@ -6387,6 +6508,8 @@ where
                 if Self::keeps_remainder_open(remainder_policy) {
                     self.upsert_open_order(OpenOrder {
                         order_id,
+                        submission_time: if self.matching_type == MatchingType::NextBarOpen { NaiveTime::from_hms_opt(9,30,0) } else { self.order_origin().1 },
+                        accepted_date: self.accepted_order_date(date),
                         decision_date: Some(self.current_decision_date(date)),
                         order_created_date: Some(self.current_order_created_date(date)),
                         symbol: symbol.to_string(),
@@ -6400,6 +6523,10 @@ where
                         execution_cursor: execution_cursors.get(symbol).copied(),
                         reason: reason.to_string(),
                     });
+                    // Waiting without a fill is not a new order-state transition.
+                    if !emit_creation_events {
+                        return Ok(());
+                    }
                     report.order_events.push(OrderEvent {
                         date,
                         decision_date: None,
@@ -6621,6 +6748,8 @@ where
             {
                 self.upsert_open_order(OpenOrder {
                     order_id,
+                    submission_time: if self.matching_type == MatchingType::NextBarOpen { NaiveTime::from_hms_opt(9,30,0) } else { self.order_origin().1 },
+                    accepted_date: self.accepted_order_date(date),
                     decision_date: Some(self.current_decision_date(date)),
                     order_created_date: Some(self.current_order_created_date(date)),
                     symbol: symbol.to_string(),
@@ -6634,6 +6763,10 @@ where
                     execution_cursor: execution_cursors.get(symbol).copied(),
                     reason: reason.to_string(),
                 });
+                // Waiting without a fill is not a new order-state transition.
+                if !emit_creation_events {
+                    return Ok(());
+                }
                 report.order_events.push(OrderEvent {
                     date,
                     decision_date: None,
@@ -6789,6 +6922,8 @@ where
         if keep_open {
             self.upsert_open_order(OpenOrder {
                 order_id,
+                submission_time: if self.matching_type == MatchingType::NextBarOpen { NaiveTime::from_hms_opt(9,30,0) } else { self.order_origin().1 },
+                accepted_date: self.accepted_order_date(date),
                 decision_date: Some(self.current_decision_date(date)),
                 order_created_date: Some(self.current_order_created_date(date)),
                 symbol: symbol.to_string(),
@@ -7258,68 +7393,19 @@ where
     fn market_fillable_quantity(
         &self,
         snapshot: &crate::data::DailyMarketSnapshot,
-        side: OrderSide,
         requested_qty: u32,
-        minimum_order_quantity: u32,
-        order_step_size: u32,
-        consumed_turnover: u32,
-        allow_odd_lot_sell: bool,
+        algorithmic_order: bool,
     ) -> Result<u32, String> {
         if requested_qty == 0 {
             return Ok(0);
         }
 
-        let uses_intraday_quantity = self.matching_type_uses_intraday_quotes();
-        let available_market_volume = if uses_intraday_quantity {
-            snapshot.minute_volume
-        } else {
-            snapshot.volume
-        };
-        let no_volume_reason = if uses_intraday_quantity {
-            "minute no volume"
-        } else {
-            "daily no volume"
-        };
-        let volume_limit_reason = if uses_intraday_quantity {
-            "minute volume limit"
-        } else {
-            "daily volume limit"
-        };
-
-        let mut max_fill = requested_qty;
-
-        if self.inactive_limit
-            && (snapshot.paused || (!uses_intraday_quantity && available_market_volume == 0))
-        {
-            return Err(if snapshot.paused {
-                "paused".to_string()
-            } else {
-                no_volume_reason.to_string()
-            });
-        }
-
-        if uses_intraday_quantity {
-            return Ok(max_fill);
-        }
-
-        if self.volume_limit {
-            let raw_limit = self.volume_rate.map_err(|error| error.to_string())?
-                .remaining(available_market_volume, u64::from(consumed_turnover), requested_qty);
-            if raw_limit == 0 {
-                return Err(volume_limit_reason.to_string());
-            }
-            let volume_limited = if side == OrderSide::Sell && allow_odd_lot_sell {
-                raw_limit
-            } else {
-                self.round_buy_quantity(raw_limit, minimum_order_quantity, order_step_size)
-            };
-            if volume_limited == 0 {
-                return Err(volume_limit_reason.to_string());
-            }
-            max_fill = max_fill.min(volume_limited);
-        }
-
-        Ok(max_fill)
+        if self.inactive_limit && snapshot.paused { return Err("paused".into()); }
+        self.volume_capacity_mode.validate(self.volume_limit, algorithmic_order || self.matching_type_uses_intraday_quotes())
+            .map_err(|error| error.to_string())?;
+        // Per-observation limits are applied to each actual quote below. The
+        // session-audit model must never size this order from the day's total.
+        Ok(requested_qty)
     }
 
     fn price_satisfies_limit(
@@ -7442,14 +7528,24 @@ where
 
         let runtime_start_time = self.runtime_intraday_start_time.get();
         let runtime_end_time = self.runtime_intraday_end_time.get();
-        let start_cursor = post_close_window.map(|window| window.0).or_else(|| {
+        let start_cursor = post_close_window.map(|window| {
+            runtime_start_time.map_or(window.0, |start| window.0.max(date.and_time(start)))
+        }).or_else(|| {
             algo_request
                 .and_then(|request| request.start_time)
                 .or(runtime_start_time)
                 .or(self.intraday_execution_start_time)
                 .map(|start_time| date.and_time(start_time))
         });
-        let end_cursor = post_close_window.map(|window| window.1).or_else(|| {
+        let start_cursor = if let Some(origin) = self.runtime_resting_order_origin.get()
+            && origin.accepted_date == date
+            && let Some(submitted) = origin.submission_time
+        {
+            Some(start_cursor.map_or(date.and_time(submitted), |cursor| cursor.max(date.and_time(submitted))))
+        } else { start_cursor };
+        let end_cursor = post_close_window.map(|window| {
+            runtime_end_time.map_or(window.1, |end| window.1.min(date.and_time(end)))
+        }).or_else(|| {
             algo_request
                 .and_then(|request| request.end_time)
                 .or(runtime_end_time)
@@ -7723,7 +7819,7 @@ where
             } else {
                 remaining_qty
             };
-            if self.volume_limit {
+            if self.volume_limit && self.volume_capacity_mode.limits_execution_quantity() {
                 let consumed = execution_ledger
                     .volume_consumed(symbol, quote.timestamp)
                     .saturating_add(
@@ -7760,7 +7856,7 @@ where
             } else {
                 remaining_qty.min(available_qty)
             };
-            if !(side == OrderSide::Sell && allow_odd_lot_sell && take_qty == remaining_qty) {
+            if !(side == OrderSide::Sell && allow_odd_lot_sell) {
                 take_qty =
                     self.round_buy_quantity(take_qty, minimum_order_quantity, order_step_size);
             }
@@ -7871,7 +7967,7 @@ where
                     .saturating_add(take_qty)
                     .min(state.displayed_quantity);
             }
-            if self.volume_limit {
+            if self.volume_limit && self.volume_capacity_mode.limits_execution_quantity() {
                 let consumed = pending_volume_consumption
                     .entry(quote.timestamp)
                     .or_default();
@@ -7885,7 +7981,7 @@ where
                     depth_price_bits,
                     displayed_quantity,
                     consume_depth,
-                    consume_volume: self.volume_limit,
+                    consume_volume: self.volume_limit && self.volume_capacity_mode.limits_execution_quantity(),
                     quantity: take_qty,
                 });
             }
@@ -7962,6 +8058,7 @@ where
     }
 
     pub(crate) fn matching_type_uses_intraday_quotes(&self) -> bool {
+        if self.resting_daily_open_order() { return true; }
         matches!(
             self.matching_type,
             MatchingType::MinuteLast
@@ -7973,6 +8070,10 @@ where
             && self.intraday_execution_start_time.is_some())
     }
 
+    pub(crate) fn drives_resting_quote_clock(&self) -> bool {
+        self.matching_type_uses_intraday_quotes() || self.matching_type == MatchingType::NextBarOpen
+    }
+
     fn quote_quantity_limited(&self, matching_type: MatchingType) -> bool {
         match matching_type {
             MatchingType::OpenAuction
@@ -8104,6 +8205,8 @@ mod tests {
             order_id,
             decision_date: None,
             order_created_date: None,
+            submission_time: None,
+            accepted_date: chrono::NaiveDate::from_ymd_opt(2025,1,2).unwrap(),
             symbol: "000001.SZ".to_string(),
             side: OrderSide::Buy,
             requested_quantity: 200,
@@ -8432,6 +8535,7 @@ mod tests {
             vec![dated_limit_test_benchmark(first), dated_limit_test_benchmark(second)],
         ).unwrap();
         let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks)
+            .with_volume_capacity_mode(crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
             .with_matching_type(MatchingType::CurrentBarClose);
         let mut portfolio = PortfolioState::new(100_000.0);
         broker.execute(first, &mut portfolio, &data, &next_open_buy_decision()).unwrap();
@@ -8458,6 +8562,7 @@ mod tests {
         let data = DataSet::from_components(vec![limit_test_instrument()], vec![limit_test_snapshot()],
             Vec::new(), vec![limit_test_candidate(true, true)], vec![limit_test_benchmark()]).unwrap();
         let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks)
+            .with_volume_capacity_mode(crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
             .with_matching_type(MatchingType::CurrentBarClose);
         broker.upsert_open_order(test_open_order(99));
         let mut decision = StrategyDecision::default();
@@ -8485,6 +8590,7 @@ mod tests {
                  dated_limit_test_candidate(second, false, false, true, true)],
             vec![dated_limit_test_benchmark(first), dated_limit_test_benchmark(second)]).unwrap();
         let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks)
+            .with_volume_capacity_mode(crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
             .with_matching_type(MatchingType::NextBarOpen);
         let mut portfolio = PortfolioState::new(1_000_000.0);
         let mut initial = StrategyDecision::default();
@@ -8634,6 +8740,77 @@ mod tests {
         );
     }
 
+    #[test]
+    fn gtc_resting_order_keeps_its_session_and_original_dates_across_days() {
+        let first = chrono::NaiveDate::from_ymd_opt(2026, 7, 6).unwrap();
+        let second = first.succ_opt().unwrap();
+        let mut snapshot = dated_limit_test_snapshot(first);
+        snapshot.open = 10.2;
+        snapshot.close = 9.8;
+        snapshot.upper_limit = 20.;
+        snapshot.lower_limit = 1.;
+        let mut next = snapshot.clone(); next.date = second;
+        let mut opening = limit_test_quote(10.2,10.2,10.2);
+        opening.date=first; opening.timestamp=first.and_hms_opt(9,30,0).unwrap();
+        let mut closing = opening.clone(); closing.timestamp=first.and_hms_opt(15,5,0).unwrap();
+        closing.last_price=9.8; closing.bid1=9.8; closing.ask1=9.8;
+        let mut next_open = closing.clone(); next_open.date=second; next_open.timestamp=second.and_hms_opt(9,30,0).unwrap();
+        let data=DataSet::from_components_with_actions_and_quotes(
+            vec![limit_test_instrument()], vec![snapshot,next], Vec::new(),
+            vec![dated_limit_test_candidate(first,false,false,true,true),dated_limit_test_candidate(second,false,false,true,true)],
+            vec![dated_limit_test_benchmark(first),dated_limit_test_benchmark(second)],Vec::new(),vec![opening,closing,next_open],
+        ).unwrap();
+        let broker=BrokerSimulator::new(ChinaAShareCostModel::default(),ChinaEquityRuleHooks)
+            .with_matching_type(MatchingType::CurrentBarClose)
+            .with_intraday_execution_start_time(NaiveTime::from_hms_opt(9,30,0).unwrap())
+            .with_volume_limit(false).with_liquidity_limit(false);
+        let decision=StrategyDecision{order_intents:vec![OrderIntent::WithTimeInForce{
+            time_in_force:OrderTimeInForce::Gtc,intent:Box::new(OrderIntent::LimitTargetShares{
+                symbol:"000001.SZ".into(),target_quantity:100,limit_price:10.,reason:"original-entry".into(),
+            })}],..StrategyDecision::default()};
+        let mut portfolio=PortfolioState::new(100000.);
+        let report=broker.execute_between(first,&mut portfolio,&data,&decision,
+            NaiveTime::from_hms_opt(9,30,0),NaiveTime::from_hms_opt(9,30,0)).unwrap();
+        assert!(report.fill_events.is_empty());
+        let report=broker.execute_between(first,&mut portfolio,&data,&StrategyDecision::default(),
+            NaiveTime::from_hms_opt(15,5,0),NaiveTime::from_hms_opt(15,5,0)).unwrap();
+        assert!(report.fill_events.is_empty()); assert!(report.order_events.is_empty());
+        assert!(broker.has_open_orders());
+        portfolio.begin_trading_day();
+        let report=broker.execute_between(second,&mut portfolio,&data,&StrategyDecision::default(),
+            NaiveTime::from_hms_opt(9,30,0),NaiveTime::from_hms_opt(9,30,0)).unwrap();
+        assert_eq!(report.fill_events.len(),1,"{report:?}");
+        assert_eq!(report.fill_events[0].order_created_date,Some(first));
+        assert_eq!(report.fill_events[0].decision_date,Some(first));
+        assert_eq!(report.fill_events[0].execution_date,Some(second));
+        assert!(!broker.has_open_orders());
+        assert!(broker.runtime_resting_order_origin.get().is_none());
+    }
+
+    #[test]
+    fn next_open_day_limit_remainder_matches_intraday_with_execution_day_ttl() {
+        let date=chrono::NaiveDate::from_ymd_opt(2026,7,7).unwrap();
+        let signal=date.pred_opt().unwrap();
+        let mut snapshot=dated_limit_test_snapshot(date);
+        snapshot.open=10.2;snapshot.close=9.8;snapshot.last_price=9.8;snapshot.upper_limit=20.;snapshot.lower_limit=1.;
+        let mut quote=limit_test_quote(9.8,9.8,9.8);quote.date=date;quote.timestamp=date.and_hms_opt(10,0,0).unwrap();
+        let data=DataSet::from_components_with_actions_and_quotes(vec![limit_test_instrument()],vec![snapshot],Vec::new(),
+            vec![dated_limit_test_candidate(date,false,false,true,true)],vec![dated_limit_test_benchmark(date)],Vec::new(),vec![quote]).unwrap();
+        let broker=BrokerSimulator::new(ChinaAShareCostModel::default(),ChinaEquityRuleHooks)
+            .with_matching_type(MatchingType::NextBarOpen).with_volume_limit(false).with_liquidity_limit(false);
+        let mut portfolio=PortfolioState::new(100000.);
+        let decision=StrategyDecision{order_intents:vec![OrderIntent::LimitTargetShares{symbol:"000001.SZ".into(),target_quantity:100,limit_price:10.,reason:"next-open-entry".into()}],..StrategyDecision::default()};
+        let report=broker.execute_with_event_dates(date,signal,signal,&mut portfolio,&data,&decision).unwrap();
+        assert!(report.fill_events.is_empty());assert!(broker.has_open_orders());
+        let report=broker.execute_between_with_event_dates(date,signal,signal,&mut portfolio,&data,&StrategyDecision::default(),
+            NaiveTime::from_hms_opt(10,0,0),NaiveTime::from_hms_opt(10,0,0)).unwrap();
+        assert_eq!(report.fill_events.len(),1,"{report:?}");
+        assert_eq!(report.fill_events[0].price,9.8);
+        assert_eq!(report.fill_events[0].execution_timestamp,date.and_hms_opt(10,0,0));
+        assert_eq!(report.fill_events[0].order_created_date,Some(signal));
+        assert!(!broker.has_open_orders());
+    }
+
     #[test]
     fn post_close_order_uses_close_without_slippage_and_waits_until_matching_window() {
         let date = chrono::NaiveDate::from_ymd_opt(2026, 7, 6).expect("valid date");
@@ -8677,6 +8854,14 @@ mod tests {
             )
             .expect("post-close order executes");
 
+        assert!(report.fill_events.is_empty(), "15:00 must not receive a future 15:05 fill");
+        assert!(broker.has_open_orders());
+        let report = broker.execute_between(date, &mut portfolio, &data, &StrategyDecision::default(),
+            NaiveTime::from_hms_opt(15,4,0),NaiveTime::from_hms_opt(15,4,0)).unwrap();
+        assert!(report.fill_events.is_empty());
+        assert!(report.order_events.is_empty());
+        let report = broker.execute_between(date, &mut portfolio, &data, &StrategyDecision::default(),
+            NaiveTime::from_hms_opt(15,5,0),NaiveTime::from_hms_opt(15,5,0)).unwrap();
         assert_eq!(report.fill_events.len(), 1, "{report:?}");
         let fill = &report.fill_events[0];
         assert_eq!(fill.price, 10.0, "fixed-price trading uses official close");
@@ -9428,7 +9613,42 @@ mod tests {
     }
 
     #[test]
-    fn current_bar_close_volume_limit_uses_daily_volume_when_minute_volume_missing() {
+    fn daily_session_volume_changes_only_audit_not_opening_fills() {
+        use crate::execution_capacity::VolumeCapacityMode;
+        let run = |volume: u64, mode: VolumeCapacityMode| {
+            let mut market = limit_test_snapshot();
+            market.volume = volume;
+            let date = market.date;
+            let data = DataSet::from_components_with_actions_and_quotes(
+                vec![limit_test_instrument()], vec![market], vec![],
+                vec![limit_test_candidate(true, true)], vec![limit_test_benchmark()], vec![], vec![],
+            ).unwrap();
+            let mut portfolio = PortfolioState::new(100_000.0);
+            let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks)
+                .with_volume_capacity_mode(mode).with_liquidity_limit(false);
+            let decision = StrategyDecision { order_intents: vec![OrderIntent::Shares {
+                symbol: "000001.SZ".into(), quantity: 1_000, reason: "capacity_test".into(),
+            }], ..StrategyDecision::default() };
+            let before = portfolio.cash();
+            let outcome = broker.execute(date, &mut portfolio, &data, &decision);
+            if outcome.is_err() { assert_eq!(portfolio.cash(), before); }
+            let audit = broker.audit_completed_session_capacity(date, &data).unwrap();
+            (outcome, portfolio.cash(), audit)
+        };
+        let (strict, _, _) = run(1_000_000, VolumeCapacityMode::ExecutionObservation);
+        assert!(strict.unwrap_err().to_string().contains("execution-time capacity is missing"));
+        let (a, cash_a, audit_a) = run(100, VolumeCapacityMode::SessionCapacityAudit);
+        let (b, cash_b, audit_b) = run(1_000_000, VolumeCapacityMode::SessionCapacityAudit);
+        let a = a.unwrap(); let b = b.unwrap();
+        assert_eq!(a.fill_events.len(), 1);
+        assert_eq!(serde_json::to_value(&a.fill_events).unwrap(), serde_json::to_value(&b.fill_events).unwrap());
+        assert_eq!(cash_a, cash_b);
+        assert_eq!(audit_a[0].filled_shares, 1_000);
+        assert!(!audit_a[0].passed); assert!(audit_b[0].passed);
+    }
+
+    #[test]
+    fn daily_capacity_requires_a_timed_observation_instead_of_falling_back_to_total_volume() {
         let mut snapshot = limit_test_snapshot();
         snapshot.minute_volume = 0;
         snapshot.volume = 1_000_000;
@@ -9444,13 +9664,13 @@ mod tests {
         .with_liquidity_limit(true);
 
         let fillable =
-            broker.market_fillable_quantity(&snapshot, OrderSide::Buy, 5_000, 100, 100, 0, false);
+            broker.market_fillable_quantity(&snapshot, 5_000, false);
 
-        assert_eq!(fillable, Ok(5_000));
+        assert!(fillable.unwrap_err().contains("daily session volume cannot size an earlier fill"));
     }
 
     #[test]
-    fn volume_limit_uses_floor_for_odd_lot_sell() {
+    fn session_capacity_audit_never_caps_an_early_odd_lot_sell() {
         let mut snapshot = limit_test_snapshot();
         snapshot.minute_volume = 0;
         snapshot.volume = 3;
@@ -9460,18 +9680,19 @@ mod tests {
             PriceField::Close,
         )
         .with_matching_type(MatchingType::CurrentBarClose)
+        .with_volume_capacity_mode(crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
         .with_volume_limit(true)
         .with_volume_percent(0.5)
         .with_liquidity_limit(false);
 
         let fillable =
-            broker.market_fillable_quantity(&snapshot, OrderSide::Sell, 10, 100, 100, 0, true);
+            broker.market_fillable_quantity(&snapshot, 10, false);
 
-        assert_eq!(fillable, Ok(1));
+        assert_eq!(fillable, Ok(10));
     }
 
     #[test]
-    fn current_bar_close_volume_limit_rejects_daily_zero_volume() {
+    fn session_audit_does_not_infer_an_opening_suspension_from_future_zero_volume() {
         let mut snapshot = limit_test_snapshot();
         snapshot.minute_volume = 0;
         snapshot.volume = 0;
@@ -9481,13 +9702,16 @@ mod tests {
             PriceField::Close,
         )
         .with_matching_type(MatchingType::CurrentBarClose)
+        .with_volume_capacity_mode(crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
         .with_volume_limit(true)
         .with_liquidity_limit(false);
 
         let fillable =
-            broker.market_fillable_quantity(&snapshot, OrderSide::Buy, 5_000, 100, 100, 0, false);
+            broker.market_fillable_quantity(&snapshot, 5_000, false);
 
-        assert_eq!(fillable, Err("daily no volume".to_string()));
+        assert_eq!(fillable, Ok(5_000));
+        snapshot.paused = true;
+        assert_eq!(broker.market_fillable_quantity(&snapshot, 5_000, false), Err("paused".into()));
     }
 
     #[test]
@@ -9508,7 +9732,7 @@ mod tests {
         .with_liquidity_limit(false);
 
         let fillable =
-            broker.market_fillable_quantity(&snapshot, OrderSide::Buy, 5_000, 100, 100, 0, false);
+            broker.market_fillable_quantity(&snapshot, 5_000, false);
 
         assert_eq!(fillable, Ok(5_000));
     }

crates/fidc-core/src/engine.rs

@@ -122,6 +122,7 @@ impl DailyEquityPoint {
 
 #[derive(Debug, Clone)]
 pub struct BacktestResult {
+    pub capacity_audit: crate::execution_capacity::CapacityAuditSummary,
     pub strategy_name: String,
     pub equity_curve: Vec<DailyEquityPoint>,
     pub benchmark_series: Vec<BenchmarkSnapshot>,
@@ -280,6 +281,7 @@ pub struct AnalyzerRiskSummary {
 
 #[derive(Debug, Clone, Serialize)]
 pub struct AnalyzerReport {
+    pub capacity_audit: crate::execution_capacity::CapacityAuditSummary,
     pub strategy_name: String,
     pub trades: Vec<AnalyzerTradeRow>,
     pub positions: Vec<AnalyzerPositionRow>,
@@ -294,6 +296,7 @@ pub struct AnalyzerReport {
 impl BacktestResult {
     pub fn analyzer_report(&self) -> AnalyzerReport {
         AnalyzerReport {
+            capacity_audit: self.capacity_audit.clone(),
             strategy_name: self.strategy_name.clone(),
             trades: self
                 .fills
@@ -2102,6 +2105,7 @@ where
             .map(|(execution_date, _)| *execution_date)
             .collect::<Vec<_>>();
         let mut result = BacktestResult {
+            capacity_audit: self.broker.capacity_audit_summary(),
             strategy_name: self.strategy.name().to_string(),
             benchmark_series: self
                 .data
@@ -2850,11 +2854,11 @@ where
             )?;
 
             if should_run_minute_events(&intraday_schedule_rules, &self.subscriptions)
-                || (self.broker.has_open_orders() && self.broker.matching_type_uses_intraday_quotes())
+                || (self.broker.has_open_orders() && self.broker.drives_resting_quote_clock())
             {
                 let unfiltered_minute_stream = self.subscriptions.is_empty();
                 let mut full_minute_symbols = self.subscriptions.clone();
-                if self.broker.matching_type_uses_intraday_quotes() {
+                if self.broker.drives_resting_quote_clock() {
                     full_minute_symbols.extend(self.broker.open_order_views().into_iter().map(|order| order.symbol));
                 }
                 if self.execution_quote_loader.is_some() && !full_minute_symbols.is_empty() {
@@ -2900,18 +2904,26 @@ where
                     .into_iter()
                     .peekable();
                 let mut minute_group = Vec::new();
+                let mut last_minute_timestamp = None;
                 // Merge the immutable quote stream with clock events. Equal
                 // timestamps form one event; scheduled callbacks run before
                 // `on_minute` below.
                 loop {
                     let next_quote_timestamp = minute_quotes.peek().map(|quote| quote.timestamp);
                     let next_schedule_timestamp = minute_schedule_timestamps.peek().copied();
+                    let next_expiry_timestamp = self.broker.next_day_order_expiry(execution_date)
+                        .map(|time| execution_date.and_time(time))
+                        .filter(|time| last_minute_timestamp.is_none_or(|last| last < *time));
                     let Some(minute_timestamp) =
-                        next_minute_event_timestamp(next_quote_timestamp, next_schedule_timestamp)
+                        next_minute_event_timestamp(
+                            next_minute_event_timestamp(next_quote_timestamp, next_schedule_timestamp),
+                            next_expiry_timestamp,
+                        )
                     else {
                         break;
                     };
                     let minute_time = minute_timestamp.time();
+                    last_minute_timestamp = Some(minute_timestamp);
                     minute_group.clear();
                     while minute_quotes
                         .peek()
@@ -3117,7 +3129,7 @@ where
                         .map(|order| order.symbol)
                         .filter(|symbol| !full_minute_symbols.contains(symbol))
                         .collect::<BTreeSet<_>>();
-                    if !newly_pending.is_empty() && self.broker.matching_type_uses_intraday_quotes() {
+                    if !newly_pending.is_empty() && self.broker.drives_resting_quote_clock() {
                         full_minute_symbols.extend(newly_pending.iter().cloned());
                         if self.execution_quote_loader.is_some() {
                             self.load_missing_execution_quotes(execution_date, None, None, &mut newly_pending)?;
@@ -3415,6 +3427,16 @@ where
                 execution_date,
             );
             let daily_fill_count = result.fills.len() - day_fill_start;
+            for audit in self.broker.audit_completed_session_capacity(execution_date, &self.data)? {
+                result.capacity_audit.observe(&audit);
+                // Keep every audit in the durable event store, independent of
+                // debug phase retention. It never changes earlier executions.
+                result.process_events.push(ProcessEvent {
+                    date: execution_date, kind: ProcessEventKind::SessionCapacityAudit,
+                    order_id: None, symbol: Some(audit.symbol.clone()), side: None,
+                    detail: serde_json::to_string(&audit).map_err(|error| BacktestError::Execution(error.to_string()))?,
+                });
+            }
             let daily_order_count = result.order_events.len() - day_order_start;
             let execution_risk_decisions =
                 risk_decisions_from_order_events(&result.order_events[day_order_start..]);
@@ -5896,8 +5918,11 @@ mod tests {
                 }], ..StrategyDecision::default() })
             }
         }
-        for partial in [false, true] {
-        let date = d(2026, 6, 1);
+        for scenario in 0..5 {
+        let partial = scenario == 1;
+        let closing_only = matches!(scenario,2|3);
+        let delayed = scenario == 4;
+        let date = if closing_only { d(2026, 7, 6) } else if delayed { d(2026, 6, 2) } else { d(2026, 6, 1) };
         let quote = |hour, minute, price| IntradayExecutionQuote {
             date, symbol: SYMBOL.into(), timestamp: date.and_hms_opt(hour, minute, 0).unwrap(),
             last_price: price, bid1: price, ask1: price, bid1_volume: 10_000, ask1_volume: 10_000,
@@ -5905,32 +5930,45 @@ mod tests {
         };
         let first = quote(9, 30, if partial { 9.8 } else { 10.2 });
         let earlier = quote(9, 29, 9.0);
-        let later = quote(10, 0, 9.8);
-        let last = quote(10, 1, 9.8);
-        let mut data = dataset_from_market_and_candidates(vec![market(date, 10.2, 9.8)], vec![candidate(date)]);
+        let unchanged = quote(9, 45, 10.2);
+        let later = quote(10, 0, if closing_only { 10.2 } else { 9.8 });
+        let last = if closing_only { quote(15, 0, if scenario == 2 { 9.8 } else { 10.2 }) } else { quote(10, 1, 9.8) };
+        let mut post_close = quote(15, 5, 9.7);
+        post_close.trading_phase = Some("post_close_fixed_price".into());
+        let prior = date.pred_opt().unwrap();
+        let markets = if delayed {vec![market(prior,10.2,10.2),market(date,10.2,9.8)]} else {vec![market(date,10.2,9.8)]};
+        let candidates = if delayed {vec![candidate(prior),candidate(date)]} else {vec![candidate(date)]};
+        let mut data = dataset_from_market_and_candidates(markets,candidates);
         data.add_execution_quotes(vec![first.clone()]);
         let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks)
-            .with_matching_type(MatchingType::CurrentBarClose)
-            .with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap())
+            .with_matching_type(if delayed {MatchingType::NextBarOpen} else {MatchingType::CurrentBarClose})
             .with_volume_limit(partial).with_volume_percent(0.01).with_liquidity_limit(false).with_inactive_limit(false);
+        let broker = if delayed {broker} else {broker.with_intraday_execution_start_time(NaiveTime::from_hms_opt(9,30,0).unwrap())};
         let requests = Arc::new(Mutex::new(Vec::new()));
         let captured = Arc::clone(&requests);
         let mut engine = BacktestEngine::new(data, RestingLimit { quantity: if partial { 300 } else { 100 } }, broker, BacktestConfig {
-            initial_cash: 100_000.0, benchmark_code: "000852.SH".into(), start_date: Some(date), end_date: Some(date),
-            decision_lag_trading_days: 0, execution_price_field: PriceField::Close,
+            initial_cash: 100_000.0, benchmark_code: "000852.SH".into(), start_date: Some(if delayed {prior} else {date}), end_date: Some(date),
+            decision_lag_trading_days: usize::from(delayed), execution_price_field: if delayed {PriceField::Open} else {PriceField::Close},
         }).with_execution_quote_loader(move |request| {
             captured.lock().unwrap().push((request.start_time, request.end_time));
-            Ok(vec![earlier.clone(), first.clone(), later.clone(), last.clone()])
+            Ok(vec![earlier.clone(), first.clone(), unchanged.clone(), later.clone(), last.clone(), post_close.clone()])
         });
         let result = engine.run().unwrap();
+        if scenario == 3 {
+            assert!(result.fills.is_empty(), "continuous DAY order must not migrate to post-close execution");
+            assert_eq!(result.order_events.len(), 2, "only initial pending and expiry are state changes");
+            assert_eq!(result.order_events.last().unwrap().status, crate::OrderStatus::Expired);
+            continue;
+        }
         assert_eq!(result.fills.len(), if partial { 3 } else { 1 }, "resting DAY order must match later actual quotes: {:?}", result.order_events);
-        assert_eq!(result.fills[0].execution_timestamp, if partial { date.and_hms_opt(9, 30, 0) } else { date.and_hms_opt(10, 0, 0) });
+        assert_eq!(result.fills[0].execution_timestamp, if partial { date.and_hms_opt(9, 30, 0) } else if closing_only { date.and_hms_opt(15, 0, 0) } else { date.and_hms_opt(10, 0, 0) });
         assert_eq!(result.fills[0].price, 9.8);
         assert_eq!(result.fills[0].quantity, 100);
         assert_eq!(result.fills.iter().map(|fill| fill.quantity).sum::<u32>(), if partial { 300 } else { 100 });
         assert!(result.fills.iter().all(|fill| fill.execution_timestamp >= date.and_hms_opt(9, 30, 0)));
         assert_eq!(requests.lock().unwrap().as_slice(), &[(None, None)]);
         assert!(!result.order_events.iter().any(|order| order.status == crate::OrderStatus::Expired));
+        assert_eq!(result.order_events.len(), if partial { 3 } else { 2 }, "unchanged pending attempts must not emit state transitions");
         }
     }
 
@@ -7014,6 +7052,7 @@ mod tests {
         let third = d(2025, 1, 6);
         let fourth = d(2025, 1, 7);
         let broker = scheduled_next_open_broker(FidcRiskControlConfig::default())
+            .with_volume_capacity_mode(crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
             .with_volume_limit(true)
             .with_volume_percent(0.25);
         let result = run_scheduled_round_trip_next_open_with_dataset_and_broker(
@@ -7041,12 +7080,13 @@ mod tests {
     }
 
     #[test]
-    fn next_bar_open_sell_volume_limit_rejects_execution_day_zero_volume() {
+    fn next_bar_open_session_audit_flags_zero_volume_without_rewriting_fills() {
         let first = d(2025, 1, 2);
         let second = d(2025, 1, 3);
         let third = d(2025, 1, 6);
         let fourth = d(2025, 1, 7);
         let broker = scheduled_next_open_broker(FidcRiskControlConfig::default())
+            .with_volume_capacity_mode(crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
             .with_volume_limit(true)
             .with_volume_percent(0.25);
         let result = run_scheduled_round_trip_next_open_with_dataset_and_broker(
@@ -7067,7 +7107,10 @@ mod tests {
             broker,
         );
 
-        assert_round_trip_sell_canceled_with_reason(&result, "daily volume limit");
+        assert!(result.fills.iter().any(|fill| fill.side == OrderSide::Sell && fill.date == fourth));
+        assert_eq!(result.capacity_audit.audit_passed, Some(false));
+        assert_eq!(result.capacity_audit.failed_symbol_sessions, 1);
+        assert!(result.process_events.iter().any(|event| event.kind == crate::ProcessEventKind::SessionCapacityAudit));
     }
 
     #[test]

crates/fidc-core/src/events.rs

@@ -317,6 +317,7 @@ pub enum ProcessEventKind {
     AccountDepositWithdraw,
     AccountFinanceRepay,
     AccountManagementFee,
+    SessionCapacityAudit,
 }
 
 impl ProcessEventKind {
@@ -362,6 +363,7 @@ impl ProcessEventKind {
             Self::AccountDepositWithdraw => "account_deposit_withdraw",
             Self::AccountFinanceRepay => "account_finance_repay",
             Self::AccountManagementFee => "account_management_fee",
+            Self::SessionCapacityAudit => "session_capacity_audit",
         }
     }
 
@@ -393,6 +395,7 @@ impl ProcessEventKind {
                 | Self::AccountDepositWithdraw
                 | Self::AccountFinanceRepay
                 | Self::AccountManagementFee
+                | Self::SessionCapacityAudit
                 | Self::Settlement
         )
     }

crates/fidc-core/src/execution_capacity.rs

@@ -12,6 +12,19 @@ pub enum VolumeCapacityMode {
     SessionCapacityAudit,
 }
 
+impl VolumeCapacityMode {
+    pub fn validate(self, enabled: bool, has_execution_observations: bool) -> Result<(), CapacityError> {
+        if !enabled { return Ok(()); }
+        match self {
+            Self::ExecutionObservation if !has_execution_observations => Err(CapacityError::MissingObservation),
+            Self::CompletedBar => Err(CapacityError::MissingCompletedBar),
+            _ => Ok(()),
+        }
+    }
+
+    pub fn limits_execution_quantity(self) -> bool { self != Self::SessionCapacityAudit }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Error)]
 pub enum CapacityError {
     #[error("execution capacity ratio must be finite and in (0, 1]")]
@@ -26,6 +39,28 @@ pub enum CapacityError {
     WrongSession,
     #[error("execution-time capacity is missing; daily session volume cannot size an earlier fill")]
     MissingObservation,
+    #[error("completed_bar capacity requires declared bar end and availability; an undated daily total is not a completed observation")]
+    MissingCompletedBar,
+}
+
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct CapacityAuditSummary {
+    pub mode: VolumeCapacityMode,
+    pub enabled: bool,
+    pub participation_rate: f64,
+    pub audited_symbol_sessions: usize,
+    pub failed_symbol_sessions: usize,
+    pub audit_passed: Option<bool>,
+    pub execution_time_capacity_proven: bool,
+}
+
+impl CapacityAuditSummary {
+    pub fn observe(&mut self, audit: &SessionCapacityAudit) {
+        self.audited_symbol_sessions += 1;
+        self.failed_symbol_sessions += usize::from(!audit.passed);
+        self.audit_passed = Some(self.failed_symbol_sessions == 0);
+    }
 }
 
 /// Decimal semantics of the frozen JSON rate, evaluated without a float product.

crates/fidc-core/src/lib.rs

@@ -33,6 +33,7 @@ pub mod stock_pool_candidates;
 pub mod stock_pool_indicators;
 pub mod stock_pool_execution;
 pub mod stock_pool_index_policy;
+pub mod stock_pool_market_cap;
 pub mod stock_pool_state;
 pub mod signal_contract;
 pub mod strategy_ai;

crates/fidc-core/src/platform_expr_strategy.rs

@@ -17,7 +17,7 @@ use crate::data::{
     decision_market_cap_bn,
 };
 use crate::engine::BacktestError;
-use crate::execution_capacity::{CapacityError, ParticipationRate};
+use crate::execution_capacity::{CapacityError, ParticipationRate, VolumeCapacityMode};
 use crate::events::{OrderSide, ProcessEvent, ProcessEventKind};
 use crate::fixed_point::FixedMoney;
 use crate::futures::{
@@ -689,6 +689,7 @@ pub struct PlatformExprStrategyConfig {
     pub rebalance_cash_mode: RebalanceCashMode,
     pub sell_then_buy_delay_slippage_rate: f64,
     pub risk_config: FidcRiskControlConfig,
+    pub volume_capacity_mode: VolumeCapacityMode,
     pub slippage_model: SlippageModel,
     pub matching_type: MatchingType,
     pub quote_quantity_limit: bool,
@@ -777,6 +778,7 @@ impl PlatformExprStrategyConfig {
             rebalance_cash_mode: RebalanceCashMode::default(),
             sell_then_buy_delay_slippage_rate: 0.0,
             risk_config: FidcRiskControlConfig::default(),
+            volume_capacity_mode: VolumeCapacityMode::ExecutionObservation,
             slippage_model: SlippageModel::None,
             matching_type: MatchingType::CurrentBarClose,
             quote_quantity_limit: true,
@@ -1378,6 +1380,9 @@ enum RuntimeHelperResolution {
 }
 
 pub struct PlatformExprStrategy {
+    // Internal service boundary, never a strategy-spec/risk switch. A planner
+    // returns intentions; only the broker/matcher can establish actual capacity.
+    intent_planning_only: bool,
     protection_fill_count: usize,
     protection_last_buys: BTreeMap<String, NaiveDate>,
     protection_last_sells: BTreeMap<String, NaiveDate>,
@@ -1498,6 +1503,9 @@ fn completed_session_factor_date(
 }
 
 impl PlatformExprStrategy {
+    pub fn new_intent_planner(config: PlatformExprStrategyConfig) -> Self {
+        Self { intent_planning_only: true, ..Self::new(config) }
+    }
     pub fn portfolio_loss_state(&self) -> Option<&PortfolioLossState> {
         self.portfolio_loss_state.as_ref()
     }
@@ -1799,6 +1807,7 @@ impl PlatformExprStrategy {
             .map(PlatformPortfolioDrawdownController::new);
         Self {
             volume_rate: ParticipationRate::new(config.risk_config.trading_constraints.volume_percent),
+            intent_planning_only: false,
             config,
             engine,
             protection_fill_count: 0,
@@ -3155,10 +3164,16 @@ impl PlatformExprStrategy {
         allow_odd_lot_sell: bool,
         current_fill_quantity: u32,
         execution_state: &ProjectedExecutionState,
+        future_execution: bool,
     ) -> Result<Option<u32>, BacktestError> {
         if requested_qty == 0 {
             return Ok(Some(0));
         }
+        if future_execution {
+            // A decision-day estimate cannot use tomorrow's liquidity to
+            // change the orders created today.
+            return Ok(Some(requested_qty));
+        }
 
         let constraints = self.config.risk_config.trading_constraints;
         let mut max_fill = requested_qty;
@@ -3201,11 +3216,14 @@ impl PlatformExprStrategy {
             }
         }
 
-        if constraints.volume_limit_enabled {
+        if constraints.volume_limit_enabled && self.config.volume_capacity_mode.limits_execution_quantity() {
             let volume_basis = match quote {
                 Some(quote) => quote.volume_delta,
-                None if market.minute_volume > 0 => market.minute_volume,
-                None => market.volume,
+                // Preserve the intent budget, without inventing a fillable
+                // volume from a daily total. The receiving paper/live service
+                // still applies its unchanged execution risk to actual quotes.
+                None if self.intent_planning_only => return Ok(Some(max_fill)),
+                None => return Err(BacktestError::Execution(CapacityError::MissingObservation.to_string())),
             };
             if volume_basis == 0 {
                 return Ok(None);
@@ -3332,6 +3350,7 @@ impl PlatformExprStrategy {
                     allow_odd_lot_sell,
                     filled_qty,
                     execution_state,
+                    Self::defer_projection_execution_risk(ctx, date),
                 )?
                 .unwrap_or(0);
             if available_qty == 0 {
@@ -3520,6 +3539,7 @@ impl PlatformExprStrategy {
                         sellable_qty >= current_qty,
                         0,
                         execution_state,
+                        Self::defer_projection_execution_risk(ctx, date),
                     )?.filter(|quantity| *quantity > 0)
             {
                 fill = Some(ProjectedExecutionFill {
@@ -4152,6 +4172,7 @@ impl PlatformExprStrategy {
                         false,
                         0,
                         execution_state,
+                        Self::defer_projection_execution_risk(ctx, date),
                     )?.filter(|quantity| *quantity > 0)
             {
                 fill = Some(ProjectedExecutionFill {
@@ -14526,6 +14547,7 @@ mod tests {
             active_datetime: None, order_events: &[], fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = symbol.to_string();
         cfg.max_positions = 1;
         cfg.refresh_rate = 1;
@@ -14559,6 +14581,7 @@ mod tests {
             active_datetime: None, order_events: &[], fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::generic();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = symbol.into();
         cfg.stock_filter_expr = "close > 0".into();
         cfg.hold_until_exit_enabled = true;
@@ -15069,6 +15092,7 @@ mod tests {
                 order_events:&[],fills:&[],
             };
             let mut cfg=PlatformExprStrategyConfig::generic();
+            cfg.risk_config.trading_constraints.volume_limit_enabled=false;
             cfg.signal_symbol=symbol.into();
             cfg.rotation_enabled=false;
             cfg.signal_book=Some(book);
@@ -15174,6 +15198,7 @@ mod tests {
         }
         let data = DataSet::from_components(parts.instruments, parts.market, parts.factors, parts.candidates, parts.benchmarks).unwrap();
         let mut config = PlatformExprStrategyConfig::generic();
+        config.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         config.universe_include = Some(BTreeSet::from(["000001.SZ".to_owned()]));
         config.signal_symbol = "000001.SZ".to_owned();
         config.benchmark_symbol = "000852.SH".to_owned();
@@ -15186,6 +15211,7 @@ mod tests {
         let rows = Arc::new(Mutex::new(Vec::new()));
         let strategy = Capture { inner: PlatformExprStrategy::new(config), first, rows: Arc::clone(&rows) };
         let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks)
+            .with_volume_capacity_mode(crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
             .with_matching_type(MatchingType::CurrentBarClose);
         let mut engine = BacktestEngine::new(data, strategy, broker, BacktestConfig {
             initial_cash: 10_000.0, benchmark_code: "000852.SH".to_owned(), start_date: Some(first),
@@ -15418,6 +15444,7 @@ mod tests {
             fills: &[],
         };
         let mut config = PlatformExprStrategyConfig::microcap_rotation();
+        config.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         config.signal_symbol = symbol.to_string();
         config.refresh_rate = 1;
         config.max_positions = 1;
@@ -15669,6 +15696,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 1;
         cfg.max_positions = 3;
@@ -18040,6 +18068,7 @@ mod tests {
                 false,
                 0,
                 &execution_state,
+                false,
             ).expect("valid volume capacity"),
             Some(2_500)
         );
@@ -18060,6 +18089,7 @@ mod tests {
                 false,
                 0,
                 &execution_state,
+                false,
             ).expect("valid remaining volume capacity"),
             Some(100)
         );
@@ -22374,6 +22404,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = symbol.to_string();
         cfg.exposure_expr = "1.0".to_string();
         cfg.selection_limit_expr = "40".to_string();
@@ -22748,6 +22779,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.rotation_enabled = false;
         cfg.daily_top_up_enabled = false;
         cfg.signal_symbol = symbol.to_string();
@@ -23704,6 +23736,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = symbol.to_string();
         cfg.exposure_expr = "0.5".to_string();
         cfg.selection_limit_expr = "40".to_string();
@@ -24960,6 +24993,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.intraday_execution_time = Some(NaiveTime::from_hms_opt(9, 33, 0).unwrap());
         cfg.signal_symbol = signal.to_string();
         cfg.max_positions = 1;
@@ -27427,6 +27461,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 99;
         cfg.max_positions = 2;
@@ -27568,6 +27603,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 99;
         cfg.max_positions = 2;
@@ -28358,6 +28394,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 99;
         cfg.max_positions = 2;
@@ -28677,6 +28714,7 @@ mod tests {
         .expect("dataset");
 
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 20;
         cfg.max_positions = 2;
@@ -28725,6 +28763,7 @@ mod tests {
         );
 
         let mut dynamic_cfg = PlatformExprStrategyConfig::microcap_rotation();
+        dynamic_cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         dynamic_cfg.signal_symbol = "000001.SZ".to_string();
         dynamic_cfg.refresh_rate = 20;
         dynamic_cfg.refresh_rate_expr = "year >= 2024 ? 5 : 20".to_string();
@@ -28750,6 +28789,7 @@ mod tests {
         );
 
         let mut signal_dates_cfg = PlatformExprStrategyConfig::microcap_rotation();
+        signal_dates_cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         signal_dates_cfg.signal_symbol = "000001.SZ".to_string();
         signal_dates_cfg.refresh_rate = 20;
         signal_dates_cfg.max_positions = 2;
@@ -28785,6 +28825,7 @@ mod tests {
         );
 
         let mut no_retry_cfg = PlatformExprStrategyConfig::microcap_rotation();
+        no_retry_cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         no_retry_cfg.signal_symbol = "000001.SZ".to_string();
         no_retry_cfg.refresh_rate = 15;
         no_retry_cfg.max_positions = 2;
@@ -28952,6 +28993,7 @@ mod tests {
         .expect("dataset");
 
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 10;
         cfg.max_positions = 2;
@@ -29129,6 +29171,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 20;
         cfg.max_positions = 2;
@@ -30342,6 +30385,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.rotation_enabled = false;
         cfg.hold_until_exit_enabled = true;
         cfg.signal_symbol = symbol.to_string();
@@ -31604,6 +31648,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 99;
         cfg.max_positions = 2;
@@ -31757,6 +31802,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 99;
         cfg.max_positions = 2;
@@ -31921,6 +31967,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 99;
         cfg.max_positions = 2;
@@ -33942,6 +33989,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 99;
         cfg.max_positions = 1;
@@ -34119,6 +34167,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.refresh_rate = 99;
         cfg.max_positions = 1;
@@ -34161,6 +34210,7 @@ mod tests {
         );
 
         let mut filtered_cfg = PlatformExprStrategyConfig::microcap_rotation();
+        filtered_cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         filtered_cfg.signal_symbol = "000001.SZ".to_string();
         filtered_cfg.refresh_rate = 99;
         filtered_cfg.max_positions = 1;
@@ -36484,6 +36534,7 @@ mod tests {
             fills: &[],
         };
         let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.volume_capacity_mode = crate::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
         cfg.signal_symbol = "000001.SZ".to_string();
         cfg.rotation_enabled = false;
         cfg.benchmark_short_ma_days = 1;

crates/fidc-core/src/platform_strategy_spec.rs

@@ -91,6 +91,8 @@ pub struct StrategyRebalanceSpec {
 #[derive(Debug, Clone, Default, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct StrategyExecutionSpec {
+    #[serde(default, alias = "volume_capacity_mode")]
+    pub volume_capacity_mode: Option<crate::execution_capacity::VolumeCapacityMode>,
     #[serde(default)]
     pub frequency: Option<String>,
     #[serde(default, alias = "matching_type")]
@@ -164,9 +166,22 @@ pub struct StrategyExecutionSpec {
     pub sell_then_buy_delay_slippage_rate: Option<f64>,
 }
 
+impl StrategyRuntimeSpec {
+    pub fn volume_capacity_mode(&self) -> Result<crate::execution_capacity::VolumeCapacityMode, String> {
+        let engine = self.engine_config.as_ref().and_then(|config| config.volume_capacity_mode);
+        let execution = self.execution.as_ref().and_then(|config| config.volume_capacity_mode);
+        if engine.zip(execution).is_some_and(|(a, b)| a != b) {
+            return Err("conflicting engine/execution volumeCapacityMode".into());
+        }
+        Ok(execution.or(engine).unwrap_or_default())
+    }
+}
+
 #[derive(Debug, Clone, Default, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct StrategyEngineConfig {
+    #[serde(default, alias = "volume_capacity_mode")]
+    pub volume_capacity_mode: Option<crate::execution_capacity::VolumeCapacityMode>,
     #[serde(default)]
     pub frequency: Option<String>,
     #[serde(default, alias = "template_id")]
@@ -1822,6 +1837,7 @@ pub fn platform_expr_config_from_spec(
     strategy_spec: Option<&StrategyRuntimeSpec>,
 ) -> Result<PlatformExprStrategyConfig, String> {
     let mut cfg = PlatformExprStrategyConfig::generic();
+    cfg.volume_capacity_mode = strategy_spec.map(StrategyRuntimeSpec::volume_capacity_mode).transpose()?.unwrap_or_default();
     cfg.strategy_name = strategy_id.to_string();
     if !signal_symbol.trim().is_empty() {
         cfg.signal_symbol = signal_symbol.trim().to_string();

crates/fidc-core/src/stock_pool_market_cap.rs

@@ -0,0 +1,108 @@
+//! Configurable index-to-market-cap band. Values are CNY, not implicit yi.
+use chrono::NaiveDate;
+use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct IndexMarketCapPolicy {
+    pub schema_version: u32,
+    pub index_code: String,
+    pub field: String,
+    pub value_unit: String,
+    pub index_low: f64,
+    pub index_high: f64,
+    pub lower_at_low: f64,
+    pub lower_at_high: f64,
+    pub upper_at_low: f64,
+    pub upper_at_high: f64,
+}
+
+impl IndexMarketCapPolicy {
+    pub fn validate(&self) -> Result<(), String> {
+        if self.schema_version != 1 || self.value_unit != "CNY"
+            || !matches!(self.field.as_str(), "market_cap" | "float_market_cap")
+        { return Err("index_market_cap_contract_invalid".into()); }
+        let index = self.index_code.split_once('.').is_some_and(|(code, exchange)| {
+            (6..=12).contains(&code.len())
+                && code.bytes().all(|byte| byte.is_ascii_uppercase() || byte.is_ascii_digit())
+                && matches!(exchange, "SH" | "SZ" | "CSI" | "CNI")
+        });
+        if !index { return Err("index_market_cap_index_invalid".into()); }
+        if [self.index_low,self.index_high,self.lower_at_low,self.lower_at_high,self.upper_at_low,self.upper_at_high]
+            .iter().any(|value| !value.is_finite() || *value <= 0.)
+            || self.index_low >= self.index_high || self.lower_at_low > self.upper_at_low
+            || self.lower_at_high > self.upper_at_high
+        { return Err("index_market_cap_bounds_invalid".into()); }
+        Ok(())
+    }
+    pub fn band(&self, close: f64) -> Result<(f64, f64), String> {
+        self.validate()?;
+        if !close.is_finite() || close <= 0. { return Err("index_market_cap_close_invalid".into()); }
+        let t = (close.clamp(self.index_low,self.index_high) - self.index_low) / (self.index_high-self.index_low);
+        Ok((self.lower_at_low + t*(self.lower_at_high-self.lower_at_low),
+            self.upper_at_low + t*(self.upper_at_high-self.upper_at_low)))
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct IndexMarketCapRow { pub date: NaiveDate, pub close: f64 }
+
+#[derive(Debug, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct Request {
+    pub policy: IndexMarketCapPolicy,
+    pub official_dates: Vec<NaiveDate>,
+    pub index_code: String,
+    pub closes: Vec<IndexMarketCapRow>,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize)]
+pub struct Band { pub date: NaiveDate, pub index_close: f64, pub lower: f64, pub upper: f64 }
+
+pub fn implementation_sha256() -> String { format!("{:x}", Sha256::digest(include_bytes!("stock_pool_market_cap.rs"))) }
+
+pub fn evaluate(input: &Request) -> Result<Vec<Band>, String> {
+    input.policy.validate()?;
+    if input.index_code != input.policy.index_code || input.official_dates.is_empty()
+        || input.official_dates.len() > 4000 || input.official_dates.len() != input.closes.len()
+        || input.official_dates.windows(2).any(|pair| pair[0]>=pair[1])
+        || input.closes.iter().zip(&input.official_dates).any(|(row, day)| row.date != *day)
+    { return Err("index_market_cap_calendar_or_identity_mismatch".into()); }
+    input.closes.iter().map(|row| {
+        let (lower,upper)=input.policy.band(row.close)?;
+        Ok(Band{date:row.date,index_close:row.close,lower,upper})
+    }).collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    fn policy()->IndexMarketCapPolicy {
+        serde_json::from_value(serde_json::json!({"schema_version":1,"index_code":"000300.SH","field":"market_cap","value_unit":"CNY",
+            "index_low":4000,"index_high":6000,"lower_at_low":2000000000_f64,"lower_at_high":3000000000_f64,
+            "upper_at_low":5000000000_f64,"upper_at_high":8000000000_f64})).unwrap()
+    }
+    #[test]
+    fn interpolates_declared_endpoints_and_clamps_without_business_defaults(){
+        assert_eq!(policy().band(3000.).unwrap(),(2e9,5e9));
+        assert_eq!(policy().band(5000.).unwrap(),(2.5e9,6.5e9));
+        assert_eq!(policy().band(7000.).unwrap(),(3e9,8e9));
+        let mut decreasing=policy();decreasing.lower_at_low=3e9;decreasing.lower_at_high=2e9;
+        assert_eq!(decreasing.band(5000.).unwrap(),(2.5e9,6.5e9));
+        assert!(policy().band(f64::NAN).is_err());
+        let mut invalid=policy();invalid.value_unit="亿元".into();assert!(invalid.validate().is_err());
+        invalid=policy();invalid.index_high=4000.;assert!(invalid.validate().is_err());
+        invalid=policy();invalid.lower_at_low=9e9;assert!(invalid.validate().is_err());
+    }
+    #[test]
+    fn missing_duplicate_or_mismatched_index_inputs_do_not_shrink_the_calendar(){
+        let day=NaiveDate::from_ymd_opt(2026,9,11).unwrap();
+        let mut input=Request{policy:policy(),official_dates:vec![day],index_code:"000300.SH".into(),closes:vec![IndexMarketCapRow{date:day,close:5000.}]};
+        assert_eq!(evaluate(&input).unwrap()[0].lower,2.5e9);
+        input.official_dates.push(day);assert!(evaluate(&input).is_err());input.official_dates.pop();
+        input.index_code="932000.CSI".into();assert!(evaluate(&input).is_err());
+        input.index_code="000300.SH".into();input.closes.clear();assert!(evaluate(&input).is_err());
+    }
+}

crates/fidc-core/tests/automatic_trade_protection.rs

@@ -107,6 +107,7 @@ fn action(quantity: &str, when: &str) -> PlatformTradeAction {
 }
 fn run(policy: AutomaticTradeProtection) -> fidc_core::BacktestResult {
     let mut config = PlatformExprStrategyConfig::generic();
+    config.volume_capacity_mode = fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
     config.signal_symbol = "000001.SZ".into();
     config.benchmark_symbol = "000300.SH".into();
     config.rotation_enabled = false;
@@ -119,7 +120,7 @@ fn run(policy: AutomaticTradeProtection) -> fidc_core::BacktestResult {
         action("-100", "decision_date >= \"2026-09-14\""),
     ];
     config.matching_type = MatchingType::CurrentBarClose;
-    let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks)
+    let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
         .with_matching_type(MatchingType::CurrentBarClose);
     BacktestEngine::new(
         data(),
@@ -276,6 +277,7 @@ fn locked_holding_keeps_its_slot_even_when_cash_can_buy_the_next_candidate() {
     )
     .unwrap();
     let mut config = PlatformExprStrategyConfig::generic();
+    config.volume_capacity_mode = fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
     config.signal_symbol = "000001.SZ".into();
     config.benchmark_symbol = "000300.SH".into();
     config.strategy_name = "protection_test".into();
@@ -294,7 +296,7 @@ fn locked_holding_keeps_its_slot_even_when_cash_can_buy_the_next_candidate() {
         }],
         ..Default::default()
     };
-    let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks)
+    let broker = BrokerSimulator::new(ChinaAShareCostModel::default(), ChinaEquityRuleHooks).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
         .with_matching_type(MatchingType::CurrentBarClose);
     let result = BacktestEngine::new(
         dataset,

crates/fidc-core/tests/corporate_actions.rs

@@ -394,7 +394,7 @@ fn engine_reinvests_dividend_receivable_in_round_lots() {
                 .with_minimum_commission(0.0),
             ChinaEquityRuleHooks::default(),
             PriceField::Open,
-        ),
+        ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit),
         BacktestConfig {
             initial_cash: 11_008.0,
             benchmark_code: "000300.SH".to_string(),
@@ -475,7 +475,7 @@ fn engine_settles_same_day_dividend_after_split_for_aiquant_semantics() {
             ChinaAShareCostModel::default(),
             ChinaEquityRuleHooks::default(),
             PriceField::Open,
-        ),
+        ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit),
         BacktestConfig {
             initial_cash: 11_008.0,
             benchmark_code: "000300.SH".to_string(),

crates/fidc-core/tests/decision_quote_preload.rs

@@ -170,7 +170,7 @@ fn engine_uses_preplanned_decision_symbols_without_recomputing_strategy_plan() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks,
         PriceField::Close,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_matching_type(MatchingType::CurrentBarClose);
     let config = BacktestConfig {
         initial_cash: 10_000.0,
@@ -235,7 +235,7 @@ fn engine_skips_decision_quote_symbol_plan_without_loader() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks,
         PriceField::Close,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_matching_type(MatchingType::CurrentBarClose);
     let config = BacktestConfig {
         initial_cash: 10_000.0,
@@ -391,7 +391,7 @@ fn engine_preloads_declared_decision_quotes_for_current_positions() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks,
         PriceField::Last,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_matching_type(MatchingType::MinuteLast)
     .with_intraday_execution_start_time(t(10, 40, 0));
     let config = BacktestConfig {
@@ -590,7 +590,7 @@ fn engine_reuses_preloaded_decision_quotes_without_loader_call() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks,
         PriceField::Last,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_matching_type(MatchingType::MinuteLast)
     .with_intraday_execution_start_time(t(10, 40, 0));
     let config = BacktestConfig {
@@ -796,7 +796,7 @@ fn engine_loads_distinct_decision_quote_times_on_same_day() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks,
         PriceField::Last,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_matching_type(MatchingType::MinuteLast)
     .with_intraday_execution_start_time(t(10, 40, 0));
     let config = BacktestConfig {

crates/fidc-core/tests/delisting.rs

@@ -295,7 +295,7 @@ fn engine_keeps_unresolved_delisted_position_without_fabricating_a_fill() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         BuyThenHoldStrategy,
@@ -548,7 +548,7 @@ fn engine_applies_successor_conversion_before_unresolved_delisting_audit() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         BuyThenHoldStrategy,

crates/fidc-core/tests/engine_hooks.rs

@@ -1219,7 +1219,7 @@ fn engine_runs_strategy_hooks_in_daily_order() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         strategy,
@@ -1260,7 +1260,7 @@ fn engine_runs_strategy_hooks_in_daily_order() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut compact_engine = BacktestEngine::new(
         compact_data,
         compact_strategy,
@@ -1401,7 +1401,7 @@ fn engine_executes_open_auction_decisions_before_on_day() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::DayOpen,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         strategy,
@@ -1497,7 +1497,7 @@ fn engine_executes_futures_order_intents_against_future_account() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         FuturesOrderStrategy,
@@ -1569,7 +1569,7 @@ fn platform_runtime_actions_execute_generic_futures_open_and_close() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         two_day_futures_data(),
         PlatformExprStrategy::new(cfg),
@@ -1609,7 +1609,7 @@ fn engine_settles_configured_futures_expiration_at_settlement() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         single_day_anchor_data(date),
         FuturesOrderStrategy,
@@ -1657,7 +1657,7 @@ fn engine_aggregates_futures_account_into_nav_and_metrics() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         single_day_anchor_data(date),
         FuturesOrderStrategy,
@@ -1700,7 +1700,7 @@ fn engine_matches_pending_futures_limit_order_with_data_driven_costs() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         two_day_futures_data(),
         FuturesLimitOrderStrategy,
@@ -1753,7 +1753,7 @@ fn engine_reports_pending_futures_order_at_backtest_boundary() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         two_day_futures_data(),
         FuturesLimitOrderStrategy,
@@ -1805,7 +1805,7 @@ fn engine_rejects_futures_limit_orders_not_aligned_to_tick() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         two_day_futures_data(),
         FuturesInvalidTickLimitStrategy,
@@ -1836,7 +1836,7 @@ fn engine_allows_disabling_futures_limit_tick_validation() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         two_day_futures_data(),
         FuturesInvalidTickLimitStrategy,
@@ -1883,7 +1883,7 @@ fn engine_rejects_futures_limit_orders_outside_price_limits() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         two_day_futures_data(),
         FuturesAboveUpperLimitStrategy,
@@ -1958,7 +1958,7 @@ fn engine_rejects_futures_orders_when_trading_phase_is_closed() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         FuturesClosedPhaseOrderStrategy,
@@ -2066,7 +2066,7 @@ fn engine_sweeps_futures_order_book_depth_when_available() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Last,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_matching_type(MatchingType::MinuteBestCounterparty);
     let mut engine = BacktestEngine::new(
         data,
@@ -2111,7 +2111,7 @@ fn strategy_context_exposes_advanced_data_helpers() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         two_day_futures_data(),
         AdvancedDataApiProbeStrategy {
@@ -2265,7 +2265,7 @@ fn engine_runs_minute_hooks_and_executes_minute_orders() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Last,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let loader_requests = Arc::new(Mutex::new(Vec::<ExecutionQuoteRequest>::new()));
     let loader_requests_for_callback = Arc::clone(&loader_requests);
     let mut engine = BacktestEngine::new(
@@ -2381,7 +2381,7 @@ fn engine_skips_empty_platform_style_minute_callbacks_between_schedule_times() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Last,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         strategy,
@@ -2579,7 +2579,7 @@ fn strategy_context_exposes_engine_native_data_helpers() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         strategy,
@@ -2683,7 +2683,7 @@ fn strategy_context_exposes_final_order_runtime_view() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Close,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         strategy,
@@ -2959,7 +2959,7 @@ fn engine_applies_account_cash_flow_and_financing_intents() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Close,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         AccountFlowStrategy,
@@ -3157,7 +3157,7 @@ fn engine_expires_pending_day_limit_orders_at_market_close() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let strategy = LimitCarryStrategy { issued: false };
     let mut engine = BacktestEngine::new(
         data,
@@ -3394,7 +3394,7 @@ fn engine_runs_scheduled_rules_for_daily_weekly_and_monthly_triggers() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::DayOpen,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         strategy,
@@ -3649,7 +3649,7 @@ fn engine_dispatches_process_events_to_external_bus_listeners() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::DayOpen,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         strategy,
@@ -3741,7 +3741,7 @@ fn engine_installs_process_mods_on_event_bus() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::DayOpen,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         HookProbeStrategy {
@@ -3778,7 +3778,7 @@ fn engine_installs_enabled_process_mods_from_loader() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::DayOpen,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         HookProbeStrategy {
@@ -3981,7 +3981,7 @@ fn engine_applies_dynamic_universe_and_subscription_directives() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         strategy,
@@ -4105,7 +4105,7 @@ fn engine_exposes_current_process_context_to_strategies() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Last,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         strategy,
@@ -4215,7 +4215,7 @@ fn engine_rejects_an_unexplained_missing_holding_close() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         BuyMissingRowThenHoldStrategy,
@@ -4290,6 +4290,7 @@ fn platform_strategy_cannot_hide_missing_valuation_by_skipping_stop_take() {
     )
     .expect("dataset");
     let mut config = PlatformExprStrategyConfig::microcap_rotation();
+    config.volume_capacity_mode = fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit;
     config.strategy_name = "missing-row-platform-risk".to_string();
     config.benchmark_symbol = "000300.SH".to_string();
     config.signal_symbol = "000001.SZ".to_string();
@@ -4314,7 +4315,7 @@ fn platform_strategy_cannot_hide_missing_valuation_by_skipping_stop_take() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut engine = BacktestEngine::new(
         data,
         PlatformExprStrategy::new(config),

crates/fidc-core/tests/explicit_order_flow.rs

@@ -202,6 +202,7 @@ fn execute_single_value_order(
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
     )
+    .with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_strict_value_budget(true);
     let report = broker
         .execute(
@@ -392,7 +393,7 @@ fn broker_executes_explicit_order_value_buy() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     let report = broker
         .execute(
@@ -682,7 +683,7 @@ fn broker_executes_order_shares_and_order_lots() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     let report = broker
         .execute(
@@ -802,7 +803,7 @@ fn broker_executes_target_shares_like_order_to() {
     let broker = BrokerSimulator::new(
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     let report = broker
         .execute(
@@ -978,7 +979,7 @@ fn broker_executes_target_portfolio_smart_with_custom_prices() {
     let broker = BrokerSimulator::new(
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     let report = broker
         .execute(
@@ -1252,7 +1253,7 @@ fn broker_executes_order_percent_and_target_percent() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     let mut percent_portfolio = PortfolioState::new(1_000_000.0);
     let percent_report = broker
@@ -1380,7 +1381,7 @@ fn broker_uses_day_open_price_for_open_auction_matching() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::DayOpen,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_slippage_model(SlippageModel::PriceRatio(0.05));
 
     let report = broker
@@ -1414,7 +1415,7 @@ fn broker_uses_day_open_price_for_open_auction_matching() {
 }
 
 #[test]
-fn broker_open_auction_uses_auction_volume_without_quote_liquidity() {
+fn broker_rejects_unproven_auction_capacity_in_a_daily_snapshot() {
     let date = NaiveDate::from_ymd_opt(2024, 1, 10).unwrap();
     let data = DataSet::from_components(
         vec![Instrument {
@@ -1511,11 +1512,10 @@ fn broker_open_auction_uses_auction_volume_without_quote_liquidity() {
                 risk_decisions: Vec::new(),
             },
         )
-        .expect("broker execution");
+        .expect_err("a timestamped daily total is not proof of auction volume");
 
-    assert_eq!(report.fill_events.len(), 1);
-    assert_eq!(report.fill_events[0].quantity, 200);
-    assert_eq!(report.fill_events[0].price, 9.8);
+    assert!(report.to_string().contains("execution-time capacity is missing"));
+    assert_eq!(portfolio.cash(), 1_000_000.0);
 }
 
 #[test]
@@ -1710,7 +1710,7 @@ fn broker_applies_price_ratio_slippage_on_snapshot_fills() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_slippage_model(SlippageModel::PriceRatio(0.01));
 
     let report = broker
@@ -2337,7 +2337,7 @@ fn broker_cancels_market_order_remainder_when_intraday_quote_liquidity_exhausted
 }
 
 #[test]
-fn broker_cancels_market_buy_when_minute_has_no_volume() {
+fn broker_rejects_missing_execution_capacity_instead_of_declaring_suspension() {
     let date = NaiveDate::from_ymd_opt(2024, 1, 10).unwrap();
     let data = DataSet::from_components(
         vec![Instrument {
@@ -2433,15 +2433,10 @@ fn broker_cancels_market_buy_when_minute_has_no_volume() {
                 risk_decisions: Vec::new(),
             },
         )
-        .expect("broker execution");
+        .expect_err("missing capacity is a contract error, not a normal no-volume cancellation");
 
-    assert_eq!(report.fill_events.len(), 0);
-    assert_eq!(report.order_events.len(), 1);
-    assert_eq!(
-        report.order_events[0].status,
-        fidc_core::OrderStatus::Canceled
-    );
-    assert!(report.order_events[0].reason.contains("daily no volume"));
+    assert!(report.to_string().contains("execution-time capacity is missing"));
+    assert_eq!(portfolio.cash(), 1_000_000.0);
 }
 
 #[test]
@@ -3679,7 +3674,7 @@ fn rebalance_uses_day_open_for_open_auction_valuation() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::DayOpen,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     let report = broker
         .execute(
@@ -3864,7 +3859,7 @@ fn rebalance_optimizer_prioritizes_higher_target_weight_when_cash_is_tight() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     let report = broker
         .execute(
@@ -4049,7 +4044,7 @@ fn rebalance_optimizer_does_not_scale_targets_above_requested_weight() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     broker
         .execute(
@@ -4163,7 +4158,7 @@ fn broker_uses_board_specific_min_quantity_and_step_size_for_buy_sizing() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_risk_config(risk_config);
 
     let report = broker
@@ -4269,7 +4264,7 @@ fn broker_allows_bjse_quantities_above_minimum_without_round_lot_step() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_risk_config(risk_config);
 
     let report = broker
@@ -4377,7 +4372,7 @@ fn broker_allows_full_odd_lot_sell_when_liquidating_position() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     let report = broker
         .execute(
@@ -4511,7 +4506,7 @@ fn same_day_sell_then_rebuy_is_rejected_by_default() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
 
     broker
         .execute(
@@ -4655,7 +4650,7 @@ fn same_day_sell_then_rebuy_can_be_allowed_by_policy() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_risk_config(risk_config);
 
     broker
@@ -4708,7 +4703,7 @@ fn broker_configured_policy_can_allow_upper_limit_buy() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_risk_config(risk_config);
     let mut portfolio = PortfolioState::new(1_000_000.0);
 
@@ -4752,7 +4747,7 @@ fn broker_configured_policy_can_allow_lower_limit_sell() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_risk_config(risk_config);
     let mut portfolio = PortfolioState::new(1_000_000.0);
     portfolio
@@ -4791,7 +4786,7 @@ fn broker_configured_policy_can_allow_lower_limit_sell() {
 fn two_day_limit_order_data(day1_open: f64, day2_open: f64) -> DataSet {
     let day1 = NaiveDate::from_ymd_opt(2024, 1, 10).unwrap();
     let day2 = NaiveDate::from_ymd_opt(2024, 1, 11).unwrap();
-    DataSet::from_components(
+    DataSet::from_components_with_actions_and_quotes(
         vec![Instrument {
             symbol: "000002.SZ".to_string(),
             name: "Test".to_string(),
@@ -4919,6 +4914,13 @@ fn two_day_limit_order_data(day1_open: f64, day2_open: f64) -> DataSet {
                 volume: 1_000_000,
             },
         ],
+        Vec::new(),
+        [(day1, day1_open), (day2, day2_open)].into_iter().map(|(date, price)| IntradayExecutionQuote {
+            date, symbol: "000002.SZ".into(), timestamp: date.and_hms_opt(9, 30, 0).unwrap(),
+            last_price: price, bid1: price, ask1: price, bid1_volume: 0, ask1_volume: 0,
+            volume_delta: 100_000, amount_delta: 100_000.0 * price,
+            trading_phase: Some("synthetic_observation_fixture".into()),
+        }).collect(),
     )
     .expect("dataset")
 }
@@ -4932,7 +4934,7 @@ fn broker_expires_day_limit_buy_at_market_close() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap());
     let mut portfolio = PortfolioState::new(1_000_000.0);
 
     let day1_report = broker
@@ -5006,7 +5008,7 @@ fn broker_ioc_limit_order_fills_available_quantity_and_cancels_remainder() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap())
     .with_volume_limit(true)
     .with_volume_percent(0.001)
     .with_liquidity_limit(false);
@@ -5042,7 +5044,7 @@ fn broker_ioc_limit_order_fills_available_quantity_and_cancels_remainder() {
 }
 
 #[test]
-fn broker_persists_daily_volume_consumption_across_execute_calls() {
+fn broker_persists_observed_volume_consumption_across_execute_calls() {
     let day1 = NaiveDate::from_ymd_opt(2024, 1, 10).unwrap();
     let day2 = NaiveDate::from_ymd_opt(2024, 1, 11).unwrap();
     let data = two_day_limit_order_data(10.0, 10.0);
@@ -5051,6 +5053,8 @@ fn broker_persists_daily_volume_consumption_across_execute_calls() {
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
     )
+    .with_matching_type(MatchingType::MinuteLast)
+    .with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap())
     .with_volume_limit(true)
     .with_volume_percent(0.001)
     .with_liquidity_limit(false);
@@ -5077,7 +5081,7 @@ fn broker_persists_daily_volume_consumption_across_execute_calls() {
     assert_eq!(second.order_events.len(), 1);
     assert_eq!(second.order_events[0].status, OrderStatus::Canceled);
     assert_eq!(second.order_events[0].filled_quantity, 0);
-    assert!(second.order_events[0].reason.contains("daily volume limit"));
+    assert!(second.order_events[0].reason.contains("intraday quote liquidity exhausted"));
     assert_eq!(portfolio.position("000002.SZ").unwrap().quantity, 100);
 
     let next_day = broker
@@ -5294,7 +5298,7 @@ fn broker_day_market_order_cancels_remainder_without_creating_invalid_open_order
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap())
     .with_volume_limit(true)
     .with_volume_percent(0.001)
     .with_liquidity_limit(false);
@@ -5334,7 +5338,7 @@ fn broker_fok_order_is_atomic_when_liquidity_is_insufficient() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap())
     .with_volume_limit(true)
     .with_volume_percent(0.001)
     .with_liquidity_limit(false);
@@ -5421,7 +5425,7 @@ fn broker_gtc_limit_order_survives_close_and_fills_next_day() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap());
     let mut portfolio = PortfolioState::new(1_000_000.0);
 
     let day1_report = broker
@@ -5469,7 +5473,7 @@ fn broker_gtc_partial_fills_preserve_cumulative_order_and_commission_state() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap())
     .with_volume_limit(true)
     .with_volume_percent(0.001)
     .with_liquidity_limit(false);
@@ -5536,7 +5540,7 @@ fn broker_modifies_gtc_limit_order_without_changing_order_identity() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap());
     let mut portfolio = PortfolioState::new(1_000_000.0);
 
     let created = broker
@@ -5621,7 +5625,7 @@ fn broker_modifies_partially_filled_gtc_total_and_preserves_commission_state() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap())
     .with_volume_limit(true)
     .with_volume_percent(0.001)
     .with_liquidity_limit(false);
@@ -5699,7 +5703,7 @@ fn broker_rejected_modify_has_zero_side_effects() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap())
     .with_volume_limit(true)
     .with_volume_percent(0.001)
     .with_liquidity_limit(false);
@@ -5767,7 +5771,7 @@ fn broker_accepted_modify_resets_queue_priority_but_reduction_preserves_it() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap());
     let mut portfolio = PortfolioState::new(1_000_000.0);
     let create = |reason: &str| StrategyDecision {
         order_intents: vec![
@@ -5899,7 +5903,7 @@ fn broker_uses_limit_price_slippage_for_limit_orders() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap())
     .with_slippage_model(SlippageModel::LimitPrice);
     let mut portfolio = PortfolioState::new(1_000_000.0);
 
@@ -5938,7 +5942,7 @@ fn broker_rejects_limit_buy_when_final_execution_price_reaches_upper_limit() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    )
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
     .with_slippage_model(SlippageModel::LimitPrice);
     let mut portfolio = PortfolioState::new(1_000_000.0);
 
@@ -5984,7 +5988,7 @@ fn broker_executes_limit_value_and_limit_percent_intents() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap());
 
     let mut value_portfolio = PortfolioState::new(1_000_000.0);
     let value_report = broker
@@ -6047,7 +6051,7 @@ fn broker_cancels_open_order_by_order_id() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_matching_type(MatchingType::MinuteLast).with_intraday_execution_start_time(NaiveTime::from_hms_opt(9, 30, 0).unwrap());
     let mut portfolio = PortfolioState::new(1_000_000.0);
 
     let day1_report = broker
@@ -6225,7 +6229,7 @@ fn broker_reserves_sellable_quantity_for_open_limit_sells() {
         ChinaAShareCostModel::default(),
         ChinaEquityRuleHooks::default(),
         PriceField::Open,
-    );
+    ).with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit);
     let mut portfolio = PortfolioState::new(1_000_000.0);
     portfolio
         .position_mut("000002.SZ")

crates/fidc-core/tests/stock_pool_execution_contract.rs

@@ -142,7 +142,13 @@ fn data_with_fund_rules(
             })
         })
         .collect();
-    DataSet::from_components(instruments, market, factors, candidates, benchmarks).unwrap()
+    let quotes = market.iter().filter(|row| row.symbol != "000300.SH").map(|row| fidc_core::IntradayExecutionQuote {
+        date: row.date, symbol: row.symbol.clone(), timestamp: row.date.and_hms_opt(9, 30, 0).unwrap(),
+        last_price: row.open, bid1: row.open, ask1: row.open, bid1_volume: 0, ask1_volume: 0,
+        volume_delta: row.volume, amount_delta: row.open * row.volume as f64,
+        trading_phase: Some("synthetic_observation_fixture".into()),
+    }).collect();
+    DataSet::from_components_with_actions_and_quotes(instruments, market, factors, candidates, benchmarks, vec![], quotes).unwrap()
 }
 fn broker(volume: bool) -> BrokerSimulator<ChinaAShareCostModel, ChinaEquityRuleHooks> {
     let mut risk = FidcRiskControlConfig::default();
@@ -159,6 +165,7 @@ fn broker(volume: bool) -> BrokerSimulator<ChinaAShareCostModel, ChinaEquityRule
         ChinaEquityRuleHooks,
     )
     .with_matching_type(MatchingType::NextBarOpen)
+    .with_intraday_execution_start_time(chrono::NaiveTime::from_hms_opt(9, 30, 0).unwrap())
     .with_risk_config(risk)
 }
 fn contract(signal: NaiveDate, target: usize, preserve: bool) -> FrozenStockPoolIntent {
@@ -268,6 +275,7 @@ fn mixed_fund_and_stock_round_trip_uses_declared_ticks_and_asset_specific_fees()
     let mut costs = ChinaAShareCostModel::default();
     costs.set_transfer_fee_rate(0.00001);
     let broker = BrokerSimulator::new(costs, ChinaEquityRuleHooks)
+        .with_volume_capacity_mode(fidc_core::execution_capacity::VolumeCapacityMode::SessionCapacityAudit)
         .with_matching_type(MatchingType::NextBarOpen);
     let mut account = PortfolioState::new(30_000.);
     let mut entry = contract(day(2), 1, false);