[rt-users] Howto overwrite user preferences

[Sternberger, Sven]

Hello!

we will upgrade soon our RT from 3.8.7 to 4.2.9, and
I would like to initially set the preference
for Theme  on System default (in our case now rudder)

I found that the Preferences are stored in the DB in the table
Attributes with the Name Pref-RT::System-1, but is there a way 
to override/alter them?

In the content I only see something like

BQkDAAAAARcDMTIwAAAAHFNlYXJjaFJlc3VsdHNSZWZyZXNoSW50ZXJ2YWw=

regards!

Sven