How can we find back the user that did this action?
The WP logs or traces don't give any hint about the link between user and ID. In the DB table AUSR, we can find information about currently logged users but not about past logins.
Release: Component: AAUTEN
If you need to make the link between a user and session ID you can activate object audit and created a revision report that also shows me the Session ID. The revision report command would look something like this: