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: redundant_unique_index_checker.rb
    path of file: ./repos/database_consistency/lib/database_consistency/checkers/index_checkers
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module DatabaseConsistency
    
      def covered_by_index
        @covered_by_index ||=
          model.connection.indexes(model.table_name).find do |another_index|
            next if index.name == another_index.name

            another_index.unique && clause_equals?(another_index) && contain_index?(another_index)
          end
      end