code: def run_queries(self, backfill_num_days=7):
          
          available_tables = self._get_download_table_ids()
          logger.debug('Found %d available download tables: %s',
                       len(available_tables), available_tables)
          today_table = available_tables[-1]
          yesterday_table = available_tables[-2]
          self.query_one_table(today_table)
          self.query_one_table(yesterday_table)
          self.backfill_history(backfill_num_days, available_tables)
docs: Run the data queries for the specified projects.
  
          :param backfill_num_days: number of days of historical data to backfill,
            if missing
          :type backfill_num_days: int