It's not a Postgres, but has a some limited Postgres dialect: CockroachDB. It has a range-based master-slave replication with routing and therefore you can use

It's not a Postgres, but has a some limited Postgres dialect: CockroachDB. It has a range-based master-slave replication with routing and therefore you can use it instead of master-master replicated solutions. Be aware of high latency of distributed databases.