def add(self, instance):
        return self.session().add(instance)

    # PRIVATE METHODS
Returns a list of all versions found in the database,
dataset/ETHPy150Open lsbardel/python-stdnet/stdnet/odm/mapper.py/Router.add--crossover with--dataset/ETHPy150Open dimagi/commcare-hq/corehq/apps/builds/utils.py/get_all_versions