I'd like Keepass to be able to inform users that the password they are trying to use is already in use in the database, so that we have no-one reusing passwords. Is this possible at all?
Not at present.
The easiest way to prevent duplication is to allow KeePass to generate all your passwords.
To test for duplicates you would need to export only title and password to HTML, then dump the output in a spreadsheet and sort.
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