> Also, "what I wrote" is just a small script to extend my previous setup (which used PostgreSQL) to replicae.

I wouldn't discount your work, etcd is very stable, so it probably works very well for your use case.

As for using Cockroachdb, I guess it depends on your use cases: with what you have now, it seems like local reads are able to read stale data (someone updates x at the leader, while you read locally), but it might not be a problem for Nest. Cockroach will always try to read the latest version of the data, so unless you need serializability, the cost of switching might not be worth it.