When the admin's source root is the mount root (/photos) and other
users have subdirectories (/photos/bob), the admin's scan now prunes
those directories from os.walk so photos aren't double-indexed under
the wrong user. The scanner queries all active source roots owned by
other users and excludes their paths during directory traversal.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
dtoro
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