Let me elaborate our problem faced while trying to use Ory Keto. We wish to create an admin panel where in a user would be able to create organisations, roles in the organisations and attach policies that are a set of permissions granted to that particular role. A user may be a part of multiple organisations. The very issue is that we trying to use Keto that's an ACL as a RBAC but it doesn't have any rewrites functionality as mentioned in the Zanzibar paper to help batch additions or deletions or roughly anything close to it without iterating over Keto data one by one.