{
  "rules": {
    ".read": false,
    ".write": false,
    "rides": {
      "$rideUuid": {
        ".read": "auth != null && data.child('participants').child(auth.uid).exists()"
      }
    },
    "drivers": {
      "$uid": {
        ".read": "auth != null && auth.uid === $uid"
      }
    }
  }
}