systemd issues

Has anyone had any luck getting systemd to play nicely with Oracle databases? It seems like every document I have read offers different suggestions and each of those come with their own set of issues

The main issue we are having is systemd killing the oracle processes in different circumstances (when databases are manually restarted due to cold backups/patching/etc). We really just want systemd to call our custom startup/shutdown scripts when the server reboots (and shutdown the database in advance of the network), instead of trying to manage the database processes

Thanks in advance