link checker / URL validation

Hi all, I just noticed that the URLs I had in Zotero for a couple conference papers no longer work. I was able to find new links (DOIs actually, whohoo!) and replace them -- but if I hadn't decided to check what the file in the IR said, I wouldn't have known about the dead link any other way.
So, I wonder if there's any interest in a link checker that you could run on your Zotero library -- or maybe just the subset of records that don't have a DOI, or the subset of records with item types that are grey lit and especially vulnerable to linkrot....
FTR this particular case did have "proper" 404 errors instead of redirects.
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