As expected, Postgres - especially with Unlogged Tables - is fast enough; additionally, having less things to run on your infrastructure and fewer integrations to manage in your app is a hugely underrated benefit.

I am just a little bit surprised on the relatively low write performance for both Postgres and Redis here; but as I can see, the tests were run on just 2 CPUs and 8 GB of RAM machine. In my experience, with 8 CPUs, Postgres can easily handle more than 15 000 writes per second using regular tables; I would imagine that it can easily be 20 000+ for the Unlogged variety - who needs more than that to cache?