docs: def clear(self, asset_manager_id, book_ids=None):
          """ This method deletes all the data for an asset_manager_id
              and option book_ids.
              It should be used with extreme caution.  In production it
              is almost always better to Inactivate rather than delete. """
          self.logger.info('Clear Transactions & Positions - Asset Manager: %s', asset_manager_id)
          url = '%s/clear/%s' % (self.endpoint, asset_manager_id)
          params = {'asset_manager_ids': ','.join(book_ids)} if book_ids else {}
          response = self.session.delete(url, params=params)
          if response.ok:
              tran_count = response.json().get('transaction_count', 'Unknown')
              self.logger.info('Deleted %s Transactions.', tran_count)
              pos_count = response.json().get('position_count', 'Unknown')
              self.logger.info('Deleted %s Positions.', pos_count)
              return response.json()
          else:
              self.logger.error(response.text)
              response.raise_for_status()