You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: fix_daily_frequency_missing_students_worker.rb
    path of file: ./repos/i-diario/app/workers
    
    the code of the file until where you have to start completion: class FixDailyFrequencyMissingStudentsWorker
  include Sidekiq::Worker

  def perform(entity_id = nil)
    entities = Entity.where(id: entity_id) if entity_id.present?
    entities ||= Entity.active

    entities.each do |entity|
      entity.using_connection do
        frequencies = DailyFrequency.by_frequency_date_between('2018-01-01'.to_date, '2018-07-17'.to_date)

        worker_batch = WorkerBatch.create!(
          main_job_class: 'FixDailyFrequencyMissingStudentsWorker',
          
    
  def perform(entity_id = nil)
    entities = Entity.where(id: entity_id) if entity_id.present?
    entities ||= Entity.active

    entities.each do |entity|
      entity.using_connection do
        frequencies = DailyFrequency.by_frequency_date_between('2018-01-01'.to_date, '2018-07-17'.to_date)

        worker_batch = WorkerBatch.create!(
          main_job_class: 'FixDailyFrequencyMissingStudentsWorker',
          main_job_id: jid,
          total_workers: frequencies.count
        )

        frequencies.each do |daily_frequency|
          DailyFrequencyCreatorWorker.perform_async(entity.id, daily_frequency.id, worker_batch.id)
        end
      end
    end
  end