fix: save HUD costs to database on session end

- Save weapon_cost_total, armor_cost_total, healing_cost_total to decay_events
- This ensures core profit calculation matches HUD display
- Insert decay events before calling end_session
- Log the saved costs for verification

ui/main_window.py

@@ -1378,6 +1378,47 @@ class MainWindow(QMainWindow):
             # Stop LogWatcher
             self._stop_log_watcher()
 
+            # Save HUD costs to database before ending session
+            if self._current_db_session_id and self.hud:
+                from decimal import Decimal
+                from datetime import datetime
+                
+                # Save weapon decay
+                if self.hud._stats.weapon_cost_total > 0:
+                    self.db.execute(
+                        """INSERT INTO decay_events 
+                           (session_id, item_name, decay_amount_ped, timestamp) 
+                           VALUES (?, ?, ?, ?)""",
+                        (self._current_db_session_id, 'Weapon', 
+                         float(self.hud._stats.weapon_cost_total), datetime.now())
+                    )
+                
+                # Save armor decay
+                if self.hud._stats.armor_cost_total > 0:
+                    self.db.execute(
+                        """INSERT INTO decay_events 
+                           (session_id, item_name, decay_amount_ped, timestamp) 
+                           VALUES (?, ?, ?, ?)""",
+                        (self._current_db_session_id, 'Armor', 
+                         float(self.hud._stats.armor_cost_total), datetime.now())
+                    )
+                
+                # Save healing decay
+                if self.hud._stats.healing_cost_total > 0:
+                    self.db.execute(
+                        """INSERT INTO decay_events 
+                           (session_id, item_name, decay_amount_ped, timestamp) 
+                           VALUES (?, ?, ?, ?)""",
+                        (self._current_db_session_id, 'Healing', 
+                         float(self.hud._stats.healing_cost_total), datetime.now())
+                    )
+                
+                self.db.commit()
+                self.log_info("Session", 
+                    f"Saved costs to DB: Weapon={self.hud._stats.weapon_cost_total:.2f}, "
+                    f"Armor={self.hud._stats.armor_cost_total:.2f}, "
+                    f"Healing={self.hud._stats.healing_cost_total:.2f}")
+
             # End session in database
             if self._current_db_session_id:
                 self.project_manager.end_session(self._current_db_session_id)