code: def save(self, session):
          
  
          if not HAS_SQL:  # pragma: nocover
              return
          try:
              conn, c = self.connect()
              c.execute('DELETE FROM {0}'.format(self.table_name))
              values = {
                  'value': sqlite3.Binary(pickle.dumps(session, protocol=2)),
              }
              c.execute('INSERT INTO {0} VALUES (:value)'.format(self.table_name), values)
              conn.commit()
              conn.close()
          except:  # pragma: nocover
              log.traceback(logging.DEBUG)
docs: Saves a requests.Session object for the next heartbeat process.