I love the idea of citus. An abstraction on top of sharding sounds amazing. The docs are clear. Their learning material is solid and actually gave me plenty of ideas.

I was really excited about citus... until I saw the price! Hosted citus is expensive. The estimator estimated thousands of dollars per month, splitting to just two small Db machines with limited ram and CPU.

For now, just spending all that money on a huge vertically scaled rds box with lots of ram and CPU made way more sense. Hopefully native Postgres eventually ties more parallel ability to take advantage of bigger and bigger rds boxes.

If we scaled past 1 big box, I'm guessing we would just do classical sharding instead.