delete from browser_stats  where count=0;
delete from system_stats   where count=0;
delete from location_stats where count=0;
delete from language_stats where count=0;
delete from size_stats     where count=0;
delete from campaign_stats where count=0;
delete from hit_stats      where stats='[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]';
delete from hit_counts     where total=0;
delete from ref_counts     where total=0;
