print "Shown files:", xsetbg_db.select('last_shown IS NOT NULL').count()
print "Not shown files:", xsetbg_db.select('last_shown IS NULL').count()
last_shown = xsetbg_db.select('last_shown IS NOT NULL',
print "Shown files:", xsetbg_db.select('last_shown IS NOT NULL').count()
print "Not shown files:", xsetbg_db.select('last_shown IS NULL').count()
last_shown = xsetbg_db.select('last_shown IS NOT NULL',