yeah, this is a definitely a "best case" workload for a sharded database. Single row reads on the key used to shard with no hotspots (no shard to shard network traffic at all).

I did not know men could build such things.

I estimated the cluster to achieve this was ~$3-4k per-hour. I am thinking there is a typo on the r8g.16xlarge and they are actually r8gd.16xlarge (notice the d) which comes with directly attached nvme disks.