I think this is a must have. Here's what happened.
I made a new postgres db, and then after some time, memory and network was used up 100% without any change for days. I tried to restart the service, but there was no option. Finally some one from the Team did the restart for me and eerything went fine.
So, if we had the option, it would be so easy. Must consider this.

I think the shutdown function is essential. Currently, we must delete an instance from the list to exit.

https://feedback.railway.app/feature-requests/p/ability-to-pause-environments
Or a pause. Useful during development when you don't want the servers to be up all the time