The article you're responding to is exactly about Postgres. Here's Redis: https://fly.io/blog/last-mile-redis/ https://fly.io/blog/last-mile-redis/ Here's a bo

The article you're responding to is exactly about Postgres. Here's Redis: https://fly.io/blog/last-mile-redis/ https://fly.io/blog/last-mile-redis/ Here's a boring Rails app that uses Postgres: https://fly-global-rails.fly.dev/ https://fly-global-rails.fly.dev/ And here's more Postgres: https://fly.io/docs/getting-started/multi-region-databases/ https://fly.io/docs/getting-started/multi-region-databases/ https://fly.io/blog/globally-distributed-postgres/ https://fly.io/blog/globally-distributed-postgres/ Rails and websockets are not very good, Phoenix and websockets work great though.