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: phpbb_postgresql.rb
    path of file: ./repos/discourse/script/bulk_import
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "base"
requir
    
  def import_group_users
    puts "Importing group users..."

    group_users = psql_query <<-SQL
      SELECT user_id, group_id
        FROM #{TABLE_PREFIX}users u
       WHERE user_id > #{@last_imported_user_id}
    SQL

    create_group_users(group_users) do |row|
      {
        group_id: group_id_from_imported_id(row["group_id"]),
        user_id: user_id_from_imported_id(row["user_id"]),
      }
    end
  end