[galaxy-user] where are my deleted datasets?

Hi, I managed to enable the possibility to 'Add datasets' via the 'Upload directory of files' option for non-admin users. It works fine: I can import (as admin and non-admin user) specific datasets into my history (copy and/or no-copy) so that I could launch some tools over them, etc. However, if I delete a specific dataset (as admin) that was imported as non-admin and then login again as non-admin, I can still see the imported datasets in my history pane. Where is actually located the reference to the (deleted) dataset? I was able to find the copied files at .../database/files/000/* , these will be cleaned out (if deleted) by the purge scripts eventually... I am using SQLAlchemy with mysql for the DB connection. cheers, Erick