“To ensure durability within that ten second window, writes are also forwarded to five replicas in separate nearby data centers as soon as they commit, and the write is only acknowledged once three of them have confirmed it.”
Cloudflare puts a SQLite database on the same host as the code that uses it. Each object runs on one thread of one machine, so scaling means carving your app into thousands of tiny databases, one per flight in Kenton Varda’s airline example. Objects also stay wherever the first request created them, with relocation “planned for the future.” Zero latency lasts until your users live on another continent.