remove_sql_header_comments

# File activerecord/lib/active_record/tasks/postgresql_database_tasks.rb, line 118
        def remove_sql_header_comments(filename)
          removing_comments = true
          tempfile = Tempfile.open("uncommented_structure.sql")
          begin
            File.foreach(filename) do |line|
              unless removing_comments && (line.start_with?(SQL_COMMENT_BEGIN) || line.blank?)
                tempfile << line
                removing_comments = false
              end
            end
          ensure
            tempfile.close
          end
          FileUtils.mv(tempfile.path, filename)
        end