def savepoint_rollback(self, sid):
        self.validate_thread_sharing()
        if self.savepoint_state:
            self._savepoint_rollback(sid)
Set the time stamp for when the certificate starts being valid
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/backends/__init__.py/BaseDatabaseWrapper.savepoint_rollback--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/pyopenssl/OpenSSL/crypto.py/X509.set_notBefore