Hi Salvatore,
I am not sure how to help with your request, perhaps should you elaborate the exact use case you have in mind.
If your purpose is linked to an auditing system, you can activate it at RDBMS level (Postgresql, MySQL, SQL Server, Oracle etc auditing capacity) or by implementing a SQL "after" trigger to record whatever you want
Usually the logic is to implement the SQL "before" trigger and allow to cancel a request.
At the Adobe Campaign side, doing something "after" deletion ("leave" form entry) is a bit late, to my mind. It should be "before" ('enter" form entry).
But perhaps it doesn't match your expectation.
Otherwise, in "before" case, you can modify the form to deny deletion, or prompt a subform. I suggest such idea but I didn't test that kind of thing yet.
Regards
J-Serge