How are you supposed to recover deleted or severely altered records if you have dozens or hundreds of users simultaneously inserting and updating records? How can you recover by going back to a point in time before a screw-up without undoing the 1000's of good updates and inserts done by other users?

That's what I don't understand. If you're the only person using the db then having point in time recovery is brilliant, but with loads of users you can't jump back to undo what "Dizzy DB Dave" did without losing all the good changes done by other people. (Assume everyone logs in via a web app so everyone appears to SQL as the same web user)

Maybe I have overlooked something?