I'm working alone on an app so, when using fetchAllSubscriptionsWithCompletionHandler
on my CloudKit database, it returns only my subscriptions. Will it be the same when the app will have more users or does it return all the subscriptions on the database?
More broadly, is a subscription in CloudKit a link between a user and the database? Does it mean that if a user uses my app both on an iPad and an iPhone she can have only one subscription and it will be enough to notify both her devices?