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: 20230906100001_add_metadata_columns_to_packages_py_pi_metadata.rb
    path of file: ./repos/gitlabhq/db/migrate
    
    the code of the file until where you have to start completion: # frozen_
    
  def up
    with_lock_retries do
      add_column :packages_pypi_metadata, :metadata_version, :text, null: true, if_not_exists: true
      add_column :packages_pypi_metadata, :summary, :text, null: true, if_not_exists: true
      add_column :packages_pypi_metadata, :keywords, :text, null: true, if_not_exists: true
      add_column :packages_pypi_metadata, :author_email, :text, null: true, if_not_exists: true
      add_column :packages_pypi_metadata, :description, :text, null: true, if_not_exists: true
      add_column :packages_pypi_metadata, :description_content_type, :text, null: true, if_not_exists: true
    end

    add_text_limit :packages_pypi_metadata, :metadata_version, 16
    add_text_limit :packages_pypi_metadata, :summary, 255
    add_text_limit :packages_pypi_metadata, :keywords, 255
    add_text_limit :packages_pypi_metadata, :author_email, 2048
    add_text_limit :packages_pypi_metadata, :description, 4000
    add_text_limit :packages_pypi_metadata, :description_content_type, 128
  end