code: def clear_sessions(hyperstream, inactive_only=True, clear_history=False):
          
          query = dict()
          if inactive_only:
              query['active'] = False
          if hyperstream.current_session is not None:
              query['session_id__ne'] = hyperstream.current_session.session_id
  
          with switch_db(SessionModel, "hyperstream"):
              for s in SessionModel.objects(**query):
                  if clear_history:
                      channel = hyperstream.channel_manager[s.history_channel]
                      stream_id = StreamId("session", meta_data=(('uuid', str(s.session_id)),))
                      try:
                          channel.purge_stream(stream_id, remove_definition=True, sandbox=None)
                      except StreamNotFoundError:
                          pass
                  s.delete()
docs: Clear all (inactive) sessions and (optionally) their history
          
          :param hyperstream: The hyperstream object
          :param inactive_only: Whether to only clear inactive sessions (active sessions may be owned by another process)
          :param clear_history: Whether to clear the history of the session. Note that this will only clear the history 
          if the creator is the same process: there could feasibly be a history stored in a file channel that is not 
           accessible by this process.