Distributed PostgreSQL as an extension
Run periodic jobs in PostgreSQL
Columnar storage extension for Postgres built as a foreign data wrapper. Check out https://github.com/citusdata/citus for a modernized columnar storage implementation built as a table access method.
Postgres extension and service for automated failover and high-availability
Rails/ActiveRecord support for distributed multi-tenant databases like Postgres+Citus
Documentation for Citus. Distributed PostgreSQL as an extension.
Exercises for the Architecting Real-Time Analytics for your Customers tutorial