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

SpiceDB

And it also becomes more "ergonomic" the more it grows:
```
definition document {
    relation admin: user
    relation owner: user
    relation editor: user
    relation reader: user
    
    
    permission view = edit + reader
    permission edit = delete + editor
    permission delete = owner + admin
}
```

Assuming of course that anyone with deletion permission should have edit + view, which I think is a fair assumption, it's much more cleaner than:

```
definition document {
    relation admin: user
    relation owner: user
    relation editor: user
    relation reader: user
    
    
    permission view = owner + admin + editor + reader
    permission edit = owner + admin + editor
    permission delete = owner + admin
}
```

It seems less error prone to me too