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: ticket_reopened.rb
    path of file: ./repos/zammad/lib/report
    
    the code of the file until where you have to start completion: # Copyright (C) 2012-2024 Zammad Foundation, https://zammad-foundation.org/

class Report::TicketReopened < Report::Base

=begin

  result = Report::TicketReopened.aggs(
    range_start: Time.zone.parse('2015-01-01T00:00:00Z'),
    range_end:   Time.zone.parse('2015-12-31T23:59:59Z'),
    interval:    'month', # quarter, month, week, day, hour, minute, second
    selector:    selector, # ticket selector to get only a collection
    
  def self.ticket_ids
    key = 'Report::TicketReopened::StateList'
    ticket_state_ids = Rails.cache.read(key)
    return ticket_state_ids if ticket_state_ids

    ticket_state_types = Ticket::StateType.where(name: %w[closed merged removed])
    ticket_state_ids = []
    ticket_state_types.each do |ticket_state_type|
      ticket_state_type.states.each do |ticket_state|
        ticket_state_ids.push ticket_state.id
      end
    end
    Rails.cache.write(key, ticket_state_ids, { expires_in: 2.days })
    ticket_state_ids
  end