[stangles1]

Good points - sharded Postgres is more likely to be a better choice in most instances. I wouldn't be surprised even if sharded Postgres would have worked well for us, but as you mentioned, for this constrained use case, Bigtable works fine.

[sitkack]

What is the recommended way to manage and interact with a shared Postgres cluster? Is it a fully connected mesh where every node running business logic talks to every Postgres node?

Would you use chain replication or a hash ring?