title: Efficient way to retrieve user count in Swift app
body: <p>I'm making a simple Swift meditation app and want to have a feature to allow users to see how many others have installed the app as well ("You're part of a community of 354 other meditators")</p>
  
  <p>My current plan - save a "blank" record on first load to public DB in CloudKit.</p>
  
  <p>Then - each client on login retrieves all the records and counts how many there are?</p>
  
  <p>Is there a better solution.  I could imagine this getting slow if there are lots of users...</p>
  
  <p>Thanks!</p>