Here's a root cause investigation: The files are created by the DB upgrade process (post-install.d/db/db.sh -> db/20140710-forum-migrate-attachments-to-fs.php db/20120603-docman-file-moved-in-fs.php db/20120409-tracker-attachement-moved-in-fs.php)
They are normally created by fusionforge-web as empty dpkg directories. Removing /var/lib/fusionforge/* from the db-local package sounds like a bad idea. Creating the directories from db-local dpkg also sounds like a bad idea since the package doesn't use them besides old data migration. We may make the upgrade procedure skip the creation of the directories is there's no data to migrate (during fresh installs). -- Sylvain
