Nepomuk database cleanup?

Hi,
   I was doing a review of diskspace usage on my day-to-day desktop
machine and was surprised to find a nepomuk directory under .kde4
containing a soprano-virtuoso.db file that's 1.3GB. Today is July 5th
and the date on the file is May 3rd.

   I have no personal knowledge of why I need or how I use nepomuk
day-to-day. In System Settings I have not enabled the Nepomuk Semantic
Desktop. Under Indexing it's set to index everything except Source
Code.

   I do not appear to have a virtuoso-t process running so I suspect
this is all wasted disk space.

   Is there a proper way to clean this up?

Thanks in advance,
Mark
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