de-proxify Zotero urls in desktop client

I have close to a 1,000 Zotero records that saved a URL with my library's old proxy. The proxy just updated and now all the URLs won't resolve. I do have the pdfs for most of the records, but not all, and I don't want to have to de-proxify each URL by hand.

Is there a fix for this? Or do I have to do it by hand?
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