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

SpiceDB

Wilcards have multiple uses, but it's really up to you. Some examples:
- feature flagging using the intersection. You can do `permission view = viewer & feature_flag`, where feature flag is a relation used to enable / disable some behaviour using the wildcard (e.g. `relation feature_flag: user:*`)
- they can be used to denote visibility levels. E.g. you can use it to implement `public` visibility in the GitHub repository model:

````
definition repository {
  relation viewer: user
  relation public: user:*

  permission view = viewer + public
}
```

I am interested in how many edge will i have to traverse if i use a wildcard in the above repository example.

Now all the users have public edges with repository.

How many edges are traversed if i am checking if user X has view permission to repostiory (via the wildcard?)

user:* does not equate to "traverse all the user edges". It's one single edge, with a special treatment

son in this case you'll traverse 2 edges. That's it.