code: def session_commit(self, session):
          
          # this may happen when there's nothing to commit
          if not hasattr(session, 'meepo_unique_id'):
              self.logger.debug("skipped - session_commit")
              return
  
          # normal session pub
          self.logger.debug("%s - session_commit" % session.meepo_unique_id)
          self._session_pub(session)
          signal("session_commit").send(session)
          self._session_del(session)
docs: Send session_commit signal in sqlalchemy ``before_commit``.
  
          This marks the success of session so the session may enter commit
          state.