Pub the events after the session committed.

        This method should be linked to sqlalchemy "after_commit" event.

def session_commit(self, session):
        """Pub the events after the session committed.

        This method should be linked to sqlalchemy "after_commit" event.
        """
        # this may happen when there's nothing to commit
        if not hasattr(session, 'meepo_unique_id'):
            self.logger.debug("skipped - session_commit")
            return

        self._session_pub(session)
        self._session_del(session)