need advice on switching off oci dev database outside working hours

Summary:

have oracle database service on oracle OCI;

need to save costs by installing automated process to shutdown database system outside weekday working hours and of course restart at beginning of each working day

can this be done by Resource Scheduler? remember this is oracle database service on old version

Is it correct that "resource scheduler" cannot be used for this and can only currently be used for "compute instances" and "autonomous databases" ?

and only option would be for us to create a compute instance in this tenancy to manage stopping / starting database system through oci commands using CLI (possibly scheduling though CRON)?