Personalized shares hashes previously used remain in. database

Can someone you please tell me to revove personalised hashes used in public link that remain in the database but are not effectively used?
I can find any traces of the in the database or even share links but when I try to entrer one hash that was previously used and shoud have been removed when share was eliminated I get
hash is already in use, please use another one

This problem has been previously raised in May (Remove public broken links in Pydio Cells 3.0.7) but no solution was provided then.

Thanks