请问 index_member_all 历史行业查询及日期字段的用法（000506.SZ）

Hello everyone, I have been studying how to use the `index_member_all` query to find the industry to which a stock belonged in the past. There are some industry relationships that I have not yet figured out, so I would like to ask for your help. Is there anything wrong with my query method or my understanding of the fields? Thank you!