[rt-users] Big size of /opt/rt4/var directory

[Ivan Osipov]

Hello all.
I'm using Request Tracker 4.2.1 and Lighttpd (1.4.28-2ubuntu4) via 
fastcgi on Ubuntu 12.04 LTS.
Now size of "/opt/rt4/var" directory is 5.2 Gb and full backup archive 
of "/opt/rt4/" is very big.
In this directory a lot of folders with random name:
---
ls -la /opt/rt4/var
[...]
drwx------   2 www-data www-data  4096 Dec 30 19:19 xO_kAcCdQA
drwx------   2 www-data www-data  4096 Dec 30 20:34 xR08jEpXhN
drwx------   2 www-data www-data  4096 Dec 30 18:21 y2A3tJXMy8
drwx------   2 www-data www-data  4096 Dec 30 21:01 Y5mPEdMSWh
drwx------   2 www-data www-data  4096 Dec 30 17:42 yBixm9CtAO
drwx------   2 www-data www-data  4096 Dec 30 17:41 yeihY9J9VX
drwx------   2 www-data www-data  4096 Dec 30 22:25 yKjJdoKUNU
[...]
---
Can I delete all this folders from "/opt/rt4/var"? If yes, how to delete 
this folders automaticaly? This is cache of attachments?

-- 
Best regards,
Ivan Osipov