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: 053_add_map_bug_tables.rb
    path of file: ./repos/openstreetmap-website/db/migrate
    
    the code of the file until where you have to start completion: class AddMapBugT
    
  def self.down
    remove_index :map_bugs, :name => "map_bugs_tile_idx"
    remove_index :map_bugs, :name => "map_bugs_changed_idx"
    remove_index :map_bugs, :name => "map_bugs_created_idx"

    drop_table :map_bugs

    drop_enumeration :map_bug_status_enum
  end