3rd_fix download

app/models/user.py

@@ -66,9 +66,13 @@ class User(db.Model):
     
     def get_total_cost(self):
         """計算使用者總成本"""
-        return db.session.query(
-            func.sum(self.api_usage_stats.cost)
-        ).scalar() or 0.0
+        try:
+            from app.models.stats import APIUsageStats
+            return db.session.query(
+                func.sum(APIUsageStats.cost)
+            ).filter(APIUsageStats.user_id == self.id).scalar() or 0.0
+        except Exception:
+            return 0.0
     
     def update_last_login(self):
         """更新最後登入時間"""