My dear. Zotero offers, on each Group Library page on your site, an important control that tells you who and when someone added or changed a reference in the Library. However, I couldn't see any information about who and when someone deletes a reference in the Library. And in Group Libraries, with multiple Administrators from different areas, all with the same authority to delete any Library Reference, the latter is important information for Library security. Is there this information somewhere? If not, could the Zotero development team consider including this important information? Thank you.