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: 20160217165451_add_uniq_index_to_materialized_views.rb
    path of file: ./repos/catarse/db/migrate
    
    the code of the file until where you have to start completion: class AddUniqIndexToMaterializ
    
  def down
    execute <<-SQL
set statement_timeout to 0;
DROP INDEX statistics_uidx;
DROP INDEX user_totals_uidx;
DROP INDEX category_totals_uidx;
    SQL
  end