Problem
Write a SQL query using window functions to compute each user's 7-day rolling engagement and rank users within each cohort.
Practicing as: Data Scientist interview at HudlHi, I'll play your Hudl interviewer for the Data Scientist role. Candidates describe these interviews as mostly positive and moderately difficult, so expect me to be friendly and conversational. Take your time with the question above and answer like we're in the room.
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