Like I said, normal practice is to make "delete" reversible, which means that you must add something as opposed to subtracting something. But in principle there

Like I said, normal practice is to make "delete" reversible, which means that you must add something as opposed to subtracting something. But in principle there is probably some duty of privacy that when you say "I've deleted X," then you actually are intending to delete X. Anything else would seem problematic.