futures.get_futures_base_info()可否加一列“摘牌日”？

因为每个期货合约是有时限的，多少年几月几日是摘牌日。目前合约名称本身只有月份信息，不知道具体交易到几号截止。
或者现有API中是否有办法查到指定期货合约的摘牌日？

Start at the named futures.get_futures_base_info() entry point and inspect how contract metadata is obtained and represented. Identify whether the existing futures data source provides a delisting date; done means the returned information includes a concrete delisting date for supported contracts, or clearly documents that the source cannot provide it.

Written by the indexing model from the issue text.