def sorted_users
      users = []
      ::User.find_each do |user|
        users.push(UserRecord.new(user.id, user.user_key, date_since_last_cache(user)))
      end
      users.sort_by(&:last_stats_update)
    end
def sorted_users
      users = []
      ::User.find_each do |user|
        users.push(UserRecord.new(user.id, user.user_key, date_since_last_cache(user)))
      end
      users.sort_by(&:last_stats_update)
    end
Returns an array of users sorted by the date of their last stats update. Users that have not been recently updated
 will be at the top of the array.