Ask HN: What database to use for high fanout write such as a social feed?

I've been reading about Twitter's architecture and Facebook's TAO architecture.

I am curious what database is best suited for the high fan-out write part?

I really enjoyed this blog post: https://blog.redplanetlabs.com/2023/08/15/how-we-reduced-the-cost-of-building-twitter-at-twitter-scale-by-100x/