This is just a few beats per minute, even after resolving peak hours and bursts.
It’s hard for me to imagine a completely new car that would have problems with this.
But to answer your question, it depends a little on which web server you choose, but about 300 MB / Rails server is the starting point for planning the deployment of a large application. Since you do not need many simultaneous transactions, you need to perform a couple of threads, and therefore a completely arbitrary 2GB machine should be more than enough.
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