Say I'm making a web app which will hold a lot of data. If a user chooses to delete something, would you delete the row or use a field to mark that it's been deleted?

Deleting the row will keep the size of the table down and will mean I'm not storing data I don't need but just marking the row deleted will mean nothing is ever really lost, even if the end user can't get it back themselves.

Is there a best practice for situations like this?

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