Further in their methodology they wrap a microservice around python and redis (which is doing an unmarshalling from redis and a marshalling to json) but they're

Further in their methodology they wrap a microservice around python and redis (which is doing an unmarshalling from redis and a marshalling to json) but they're not doing that with postgres. In fact, as far as I can tell, postgres is not running as a microservice here. The data still has to be marshalled into some output other services can use.