Problem
Design a SQL schema for a portfolio tracking system at Aqr and write a query to aggregate daily returns.
Practicing as: Software Engineer interview at AqrHi, I'll play your Aqr interviewer for the Software Engineer role. Candidates describe these interviews as often stressful and moderately difficult, so expect me to be direct and to the point. Take your time with the question above and answer like we're in the room.
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