App Engine instances are scaled based on the incoming requests and therefore it is not possible to assign them the user ID. This can be reported as a Feature Request and I would suggest posting it on the Public Issue Tracker <https://issuetracker.google.com/issues/new?component=187191&template=1162953> so that the engineering team could review it for future implementation. For system architecture, you may be better served in dedicated forums such as Stackoverflow <https://stackoverflow.com/>, where experienced programmers are within reach and ready to help to propose solutions in accomplishing such tasks.
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