May I ask WeChat Mini Programs how to delete the old data in the cloud database?

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I want to make a data length limit, for example, if the length of a collection in a database exceeds 1000, sort by time, delete the old data, and then add new data.
now is the length limit and sorting I am more clear, but after sorting why remove did not understand, what should I do?

Database WeChat-Mini-Programs Mini-Program

Jul.11,2021

get the date of the data sorted as 1000, delete the data before that date

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