KDE eating my disk?

Mon Jan 27 23:56:53 UTC 2014

My /home partition is getting full.  Bad me.

I'm looking around at the largest files that don't seem useful to me.

~/.kde/share/apps/nepomuk/repository/main/data/virtuosobackend is 105 megs 
and I don't know what it is.

It hasn't been modified for 9 months.

Googling suggests that it might be a file index for KDE.  I don't use KDE 
(but I do use a few of its programs under Gnome (eg. kolorpaint, 
kompare)).  I admit that I have tried KDE on this Linux system.

Does an index really take 105 MiB?  I've got locate, and its system-wide 
database is 24 MiB.

How can I politely ask this thing to go away?
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