https://forum.dokuwiki.org/post/35558
In the meantime, as for cleaning up old media files, you might try the plugin unusedmedias (I haven't tried yet).
https://www.dokuwiki.org/plugin:unusedmedias
https://www.dokuwiki.org/plugin:unusedmedias
Not compatible and has not been updated.
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About deleting multiple pages:
https://forum.dokuwiki.org/post/35445
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Andi response:
Quote by raargh on 2012-11-02, 12:35:
Of course, for those of us who manage the Linux boxes on which our Dokuwikis run, we can dive into the structure and delete at will.
Why would that require Linux? Deleting a file (or multiple) is quite simple in any OS or even FTP.
Quote by raargh on 2012-11-02, 12:35:
The problem with that, is it often messes up *something* in the arcane PHP guts of the wiki.
That is just wrong. One of DokuWiki's main features is that it works well with filesystem changes. You want to delete all pages in a namespace? Just delete the appropriate folder in the data/pages directory. It doesn't get easier than that.