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: 20161228000001_add_taskbar_meta.rb
    path of file: ./repos/zammad/db/migrate
    
    the code of the file until where you have to start completion: # Copyright (C) 2012-2024 Zammad Foundatio
    
  def up
    # return if it's a new setup
    return if !Setting.exists?(name: 'system_init_done')

    add_column :taskbars, :preferences, :text, limit: 5.megabytes + 1, null: true
    add_index :taskbars, [:key]

    Rails.cache.clear
  end