set_server_id_exists_until(server_id, NTTIME until)

	set_server_id_not_to_verify_until()

	server_id_is_disconnected(struct server_id)

	if (serverid_exists()) ...
	if (serverid_exists() && !server_id_is_diconn()) ...
	===== ODER ===
	if (serverid_is_disconn() || serverid_exsist()) ...
	if (server_id_exists()) ...

	broadcast/stellvertreter
	========================
	situation:
	- disconnected durable handle with delete on close
	- other client opens the file before scavenger timer is expired
	==> need to delete the file, client gets "file was created"