Also, I had a question around race conditions when writing and reading edges concurrently. Are relations written by WriteRelationships written atomically? What about BulkImportRelationships? Is it different per backend (ex: Postgres vs Cockroach)? The scenario is what if I'm changing the owner of a document from one person to another in the same call, and then there's a concurrent read via a CheckPermission call. Will the concurrent read ever see an intermediate state like no owners or both as owners? Thanks