refactor(execution): simplify zero size handling

app/src/trading/execution/sizing.py

@@ -43,12 +43,10 @@ class ExecutionSizingMixin(_ExecutionSizingProtocol):
         balance_usd = safe_float(state.allocated_balance_usd) or 0.0
 
         if risk_percent is None or risk_percent <= 0:
-            self._sync_adaptive_size_state(state, base_size=0.0, final_size=0.0, multiplier=0.0)
-            return 0.0
+            return self._zero_position_size(state)
 
         if stop_loss_percent is None or stop_loss_percent <= 0:
-            self._sync_adaptive_size_state(state, base_size=0.0, final_size=0.0, multiplier=0.0)
-            return 0.0
+            return self._zero_position_size(state)
 
         price = safe_float(entry_price)
 
@@ -59,15 +57,13 @@ class ExecutionSizingMixin(_ExecutionSizingProtocol):
                 price = None
 
         if price is None or price <= 0:
-            self._sync_adaptive_size_state(state, base_size=0.0, final_size=0.0, multiplier=0.0)
-            return 0.0
+            return self._zero_position_size(state)
 
         target_risk_usd = balance_usd * (risk_percent / 100)
         stop_loss_distance_usd = price * (stop_loss_percent / 100)
 
         if target_risk_usd <= 0 or stop_loss_distance_usd <= 0:
-            self._sync_adaptive_size_state(state, base_size=0.0, final_size=0.0, multiplier=0.0)
-            return 0.0
+            return self._zero_position_size(state)
 
         base_size = target_risk_usd / stop_loss_distance_usd
         multiplier = self._adaptive_size_multiplier(state)
@@ -82,6 +78,17 @@ class ExecutionSizingMixin(_ExecutionSizingProtocol):
 
         return self._round_size(final_size)
 
+    # единый выход из расчёта size, когда вход невозможен:
+    # сбрасывает adaptive size/runtime risk в 0 и возвращает 0.0
+    def _zero_position_size(self, state: AutoTradeState) -> float:
+        self._sync_adaptive_size_state(
+            state,
+            base_size=0.0,
+            final_size=0.0,
+            multiplier=0.0,
+        )
+        return 0.0
+
     # рассчитать коэффициент изменения размера позиции по итоговым runtime/context факторам
     def _adaptive_size_multiplier(self, state: AutoTradeState) -> float:
         multiplier = 1.0
@@ -204,9 +211,10 @@ class ExecutionSizingMixin(_ExecutionSizingProtocol):
             4,
         )
 
+        allocated_balance = safe_float(state.allocated_balance_usd) or 0.0
+
         state.effective_target_risk_usd = round(
-            state.allocated_balance_usd
-            * (state.effective_risk_percent / 100),
+            allocated_balance * (state.effective_risk_percent / 100),
             4,
         )
 
@@ -303,9 +311,10 @@ class ExecutionSizingMixin(_ExecutionSizingProtocol):
             4,
         )
 
+        allocated_balance = safe_float(state.allocated_balance_usd) or 0.0
+
         state.effective_target_risk_usd = round(
-            state.allocated_balance_usd
-            * (state.effective_risk_percent / 100),
+            allocated_balance * (state.effective_risk_percent / 100),
             4,
         )