More I think about is - more I am convinced that this is something that 
must be implemented via nested flows, like - the step to extract the 
initial user profile and then extract all associated records must be 
implemented as a separate Graph, that is invoked as part of transformation 
of the input stream. 

So I have a flow nested in another flow with it's own materializer - on 
every user ID from the outer flow I spawn another instance of inner flow 
and wait until it completes, and then send the data down to the appropriate 
sinks.

Am I missing something?

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