Bulk delete of Zotero entries *without* a specific Extra tag?

Some prior users of my institutional account used Zotero to upload approximately 70,000 entries, of which I need approximately 500.

I've tagged the 500 with a unique code ("documentName:"), so I can easily access them if needed. However, I'd really like to just delete the rest of the 70K from my account, since it renders the desktop version functionally unusable. Is there any way to do this? IIRC, you can't bulk-delete items from the browser portal, but I was hoping there'd be some search exclusion process, similar to the Boolean NOT.

Thanks, and apologies if this has already been covered elsewhere.
  • You can add "Extra" as a column in the web library, click on it sort, and then delete all items before documentName and after it. Not sure how well that's going to work online, either, at that size of library (which is large, but not so large that I'd expect it to be useless locally.)
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