SpiceDB is an open source, Google Zanzibar-inspired, database system for creating and managing security-critical application permissions.

SpiceDB

Hello all ! 

I have a schema in which I have a recursive relation : Parent
I also have a relation "secured" that is partly calculated on that parent relation. 
the issue I have is when I get to the top item, that has no parent. 

is there a way to add a condition in the permission to not go further and ignore the permission check on that root item ?

here is a schema definition conaitning the idea : 

```
definition workspace {
    relation parent: workspace
    permission secured = parent->secured & other_irrelevant_perm
    permission other_irrelevant_perm = <the other permission checked at each level>
}
```

is there a way to ignore the `parent->secured`if `parent` has no relations ?