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

SpiceDB

And this is the graphql request made from client:
{
    "data": {
        "populateTenant": {
            "tenant": null,
            "ok": false,
            "errors": [{
                "code": "INVALID_REQUEST",
                "details": "",
                "__typename": "Error"
            }],
            "__typename": "PopulateTenant"
        }
    }
}