Report.add_report("visits") do |report|
  report.group_filtering = true
  report.icon = 'user'

  basic_report_about report, UserVisit, :by_day, report.start_date, report.end_date, report.group_id
  add_counts report, UserVisit, 'visited_at'

  report.prev30Days = UserVisit.where("visited_at >= ? and visited_at < ?", report.start_date - 30.days, report.start_date).count
end