Use cost validation to limit query depth

[pylipp]

Hej all, I'd like to know whether (and how) I can use cost validation to limit the query depth. E.g. a client could request

query {
  house(id: 1) {
    floors {
      rooms {
        furniture {
          room {
            floor {
              house {
                id
} } } } } } } }

and put a high load on the system. When I use e.g. default_cost=1, maximum_cost=5 the request cannot go deeper than furniture level but at the same time I can't query for more than 5 fields of any resource. Do I have to use the @cost directive in specific places? At this point, the question becomes a general one about GraphQL. I was wondering if there's a solution specifically in ariadne already. Thanks!