Leetcode 3673. Find Zombie Sessions

Group events by session_id (and user) to compute session duration, scroll and click counts, and purchases, and return sessions with duration > 30 minutes, at least 5 scroll events, zero purchases, and a click-to-scroll ratio < 0.20, ordered by scroll_count desc then session_id asc.

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Leetcode 3673. Find Zombie Sessions

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