Delete duplicate PDFs / Delete broken links

When I searched my database for publications with more than one PDF attached (file attachments -> contains -> *.pdf*.pdf), I found over 500.  Many of these were broken links. 

It would be great to have a function that deleted broken links (if it can find all broken links, why not delete them as well).  Why does the updateput a second pdf there anyway?

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Problem is that if the link is automatically removed you dont know if there was any link there in the first place. Alternatively, there could be a function to search for any new links though I suspect that would be many times slower than individualy deletions