Hello,

I need to store per-user information into the datastore. I am using user 
services to obtain user information.

UserService us = UserServiceFactory.getUserService();
User user = us.getCurrentUser();

I see that User class has two methods to obtain id information, 
getFederatedIdentity() and getUserId(). Which of these two can be used as 
the primary key for storing per-user information.

Thank you in advance for your help.

Regards,
Peter

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