[Rails] Как организовать ежемесячное выставление счета?

select `id` from `bill` where `user_id`=123 and `time_create`>now() - interval 1 month and `payd`='n'  limit 1;

def update_last_seen
  if current_user
    if (Time.now - 3.hours) >= current_user.last_seen
      current_user.last_seen = Time.now
    current_user.save
  end
end

every :month do 
  runner "User.set_bill" # метод выставления счета для пользователей по вашим параметрам
end

class MyWorker
  include Sidekiq::Worker
  include Sidetiq::Schedulable

  recurrence { monthly }

  def perform
    # do stuff ...
  end
end