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I'm registering the devices of my app users with a third-party push notification service.

I need to associate each device with its user at the service so that I can target a specific user's devices when sending a notification.

I could associate the device with the user's database Id, but I'm inclined to use a special GUID identifier in order to hide the user's database key.

I reckon the database key could leak information about the system, including a hint as to the number of users of the system.

Does this sound unnecessary?

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