How to manually add/delete Database rows/columns/ or entries?

Could anyone quickly expand any on the Manual deletion of Database row/column entries without having to send a separate REST delete for each entry after a Query?

I also would like to delete columns from the DB after a specified period of time and would like to auto create columns as well. Is this possible?

I found this topic referenced the ability to do manual deletion but without a lot of explanation.

Thanks for any help you can give,
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