Deleted posts stay inside the DB for some time

Is there any housekeeping script that could at least let an admin permanently delete a message from the database ?

Our teams sometimes send messages with sensitive information. As there is no volatile room or something similar to anonymous browsing (guarantee that nothing is stored long terms) in mattermost, we would at the very least like that message marked as deleted are permanently deleted.

If not, I’ll probably open a new feature suggestion. I understand my suggestion is the exact opposite of Delete posted messages but, sometimes, for security matters, delete really has to mean delete (now and forever with no way back).