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: 20181009222042_cached_slug_not_null.rb
    path of file: ./repos/linuxfr.org/db/migrate
    
    the code of the file until where you have to start completion: class CachedSlugNotNull < ActiveRecord::Migration[4.2]
  def up
    execute "ALTER TA
    
  def down
    execute "ALTER TABLE bookmarks MODIFY cached_slug varchar(165) NULL;"
    execute "ALTER TABLE diaries MODIFY cached_slug varchar(165) NULL;"
    execute "ALTER TABLE forums MODIFY cached_slug varchar(32) NULL;"
    execute "ALTER TABLE news MODIFY cached_slug varchar(165) NULL;"
    execute "ALTER TABLE polls MODIFY cached_slug varchar(128) NULL;"
    execute "ALTER TABLE posts MODIFY cached_slug varchar(165) NULL;"
    execute "ALTER TABLE sections MODIFY cached_slug varchar(32) NULL;"
    execute "ALTER TABLE trackers MODIFY cached_slug varchar(105) NULL;"
    execute "ALTER TABLE users MODIFY cached_slug varchar(32) NULL;"
    execute "ALTER TABLE wiki_pages MODIFY cached_slug varchar(105) NULL;"
  end