Hi, I was quite interested in how can we use the idea of shards in keto, didnt spent much time in exploring. But has anyone did it to scale keto instances? Would be interested to know this.

Hello, this is not implemented afaik, but planned & on the roadmap: https://github.com/ory/keto/issues/306

The current database schema has a UUIDv4 as the first part of the primary key, so that is used for sharding by default (i.e. random)