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: schema_cleaner.rb
    path of file: ./repos/gitlabhq/lib/gitlab/database
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Gitlab
  module Database
    class SchemaCleaner
      attr_reader :original_schema

      def initialize(original_schema)
        @original_schema = original_schema
      end

      def clean(io)
        structure = original_schema.dup

        # Remove noise
        structure.gsub!(/^COMMENT ON EXTENSION.*/, '')
        structure.gsub!(/^SET.+/, '')
        structure.gsub!(/^SELECT pg_catalog\.set_config\('search_path'.+/, '')
        structure.gsub!(/^--.*/, "\n")

        # We typically don't assume we're working with the public schema.
        # pg_dump uses fully qualified object names though, since we have multiple schemas
        # in the database.
        #
        # The intention here is to not introduce an assumption about the standard schema,
        # unless we have a good reason to do so.
        structure.gsub!(/public\.(\w+)/, '\1')
        structure.gsub!(
          /CREATE EXTENSION IF NOT EXISTS (\w+) WITH SCHEMA public;/,
          'CREATE EXTENSION IF NOT EXISTS \1;'
        )

        # Table lock-writes triggers should not be added to the schema
        # These triggers are added by the rake task gitlab:db:lock_writes for a decomposed database.
        structure.gsub!(
          %r{
            ^CREATE.TRIGGER.gitlab_schema_write_trigger_\w+
            \s
            BEFORE.INSERT.OR.DELETE.OR.UPDATE.OR.TRUNCATE.ON.\w+
            
    
      def clean(io)
        structure = original_schema.dup

        # Remove noise
        structure.gsub!(/^COMMENT ON EXTENSION.*/, '')
        structure.gsub!(/^SET.+/, '')
        structure.gsub!(/^SELECT pg_catalog\.set_config\('search_path'.+/, '')
        structure.gsub!(/^--.*/, "\n")

        # We typically don't assume we're working with the public schema.
        # pg_dump uses fully qualified object names though, since we have multiple schemas
        # in the database.
        #
        # The intention here is to not introduce an assumption about the standard schema,
        # unless we have a good reason to do so.
        structure.gsub!(/public\.(\w+)/, '\1')
        structure.gsub!(
          /CREATE EXTENSION IF NOT EXISTS (\w+) WITH SCHEMA public;/,
          'CREATE EXTENSION IF NOT EXISTS \1;'
        )

        # Table lock-writes triggers should not be added to the schema
        # These triggers are added by the rake task gitlab:db:lock_writes for a decomposed database.
        structure.gsub!(
          %r{
            ^CREATE.TRIGGER.gitlab_schema_write_trigger_\w+
            \s
            BEFORE.INSERT.OR.DELETE.OR.UPDATE.OR.TRUNCATE.ON.\w+
            \s
            FOR.EACH.STATEMENT.EXECUTE.FUNCTION.gitlab_schema_prevent_write\(\);$
          }x,
          ''
        )

        structure.gsub!(/\n{3,}/, "\n\n")

        io << structure.strip
        io << "\n"

        nil
      end
    end
  end