Never mind, found https://authzed.com/blog/lookup-subjects/ Nice. One more question, I saw a blog post talking about dual writes https://authzed.com/blog/writing-relationships-to-spicedb/. My question is in what cases it would be nice to store relationships outside spicedb as well? Why can't I write all relationship data in spicedb only? SpiceDB is an authz machine, I wanted to know if can I also use this to manage relationships between resources as well? Like parent/child, memberships, etc.