Gmail's "undo send" functionality faces a similar but different problem: once an email has actually been sent, there is no way to undo it. They way they solve t

Gmail's "undo send" functionality faces a similar but different problem: once an email has actually been sent, there is no way to undo it. They way they solve that is by letting you configure a delay, so you have some period of time in which the email hasn't actually been sent yet so you can undo it. Something similar could work here. When you delete some data, it gets soft deleted (still exists in your database/etc, but is considered deleted by the application). After a matter of minutes (hours?), it gets actually deleted. You've got a grace period in which you can undo the delete, and then it's gone forever. Since the most common use case for an 'undo' feature is undoing something you did very recently, that should strike a good balance.