vicuna
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Duplicate prevention
I believe that commons uploading tools should detect duplicates of existing files and at least warn before accepting to upload such files.
Maybe useful: Exact duplicates are already automatically detected on Commons and get listed here: https://commons.wikimedia.org/wiki/Special:ListDuplicatedFiles I don't know if there's already the possibility to query Commons with a file hash..?
Such features are also mentioned here: https://de.wikipedia.org/wiki/Wikipedia:Umfragen/Technische_W%C3%BCnsche_2015/Dateien_und_Commons#Upload (list of requests for tech features from a poll)