docs: def add_namespace_statistics(self, namespace, offset, data_points,
                                   byte_count):
          """Update namespace statistics for the period identified by
          offset"""
          query = 'UPDATE gauged_statistics ' \
              'SET data_points = data_points + %s,' \
              'byte_count = byte_count + %s WHERE namespace = %s ' \
              'AND "offset" = %s; INSERT INTO gauged_statistics ' \
              'SELECT %s, %s, %s, %s WHERE NOT EXISTS (' \
              'SELECT 1 FROM gauged_statistics WHERE namespace = %s' \
              'AND "offset" = %s)'
          self.cursor.execute(query, (data_points, byte_count, namespace,
                                      offset, namespace, offset, data_points,
                                      byte_count, namespace, offset))