Hi SpiceDB, what is the performance of calling

LookupResources

on a subject? How is billing done for this function? I've got a resource (let's call it city) with a very large number of available resources (Indianapolis, New York, Orlando, etc..). I've got a subject (let's call it passenger) who has permission (let's call it travel) with A LOT of city relationships. In other words, Passenger John can travel to 10,000 different cities. If I want

LookupResources

to return this list of travelable cities for John, am I being billed for 10,000 different dispatched operations? Or just 1? And if I do multiple lookups for the same passenger, do these cache?