fix: added pgBouncer for conn pool manage

api_man/serializers.py

@@ -161,11 +161,15 @@ class DeviceInfoSerializer(BaseSerializer):
 
 class VehicleTransportRecordSerializer(BaseSerializer):
     vehicle_type_name = serializers.CharField(source='vehicle_type.name', read_only=True)
+    # 显式定义 vehicle_type 字段，避免 depth=1 影响反序列化
+    vehicle_type = serializers.PrimaryKeyRelatedField(
+        queryset=basic_models.VehicleType.objects.all()
+    )
     
     class Meta:
         model = basic_models.VehicleTransportRecord
         fields = '__all__'
-        depth = 1  # 展开外键关系
+        depth = 1  # 展开外键关系（仅影响序列化输出）
 
 
 class UserSerializerSimple(serializers.ModelSerializer):