content_item__del has deleted live revisions since
http://cvs.openacs.org/cvs/openacs-4/packages/acs-content-repository/sql/postgresql/content-item.sql?rev=1.63&view=markupIE: raise
NOTICE ''Unsetting live and latest revisions...'';
update cr_items set live_revision = null, latest_revision = null where item_id = delete__item_id;