if usage_data:

                usage = Usage(

                    input=usage_data.get("input", 0) or 0,

                    output=usage_data.get("output", 0) or 0,

                    total=usage_data.get("total", 0) or 0,

                    unit=usage_data.get("unit"),

                    input_cost=usage_data.get("inputCost"),

                    output_cost=usage_data.get("outputCost"),

                    total_cost=usage_data.get("totalCost"),

                )



            body = CreateGenerationBody(    # ← 不要动这一行，在它上面插入

                id=data.get("id"),