From icwmp point of view, services which can cause upstream/wan disruption are critical services and these are applied at the end of the sessions. These services are defined in '/etc/icwmpd/critical_services.json'.
cwmp runtime configuration present in /var/state/ directory, with uci/libuci -c option commit changes(including standard uci) to runtime path, this change to segregate the standard uci changes flow with run time config changes.