fix: replace O(n²) linear scans with O(1) Map lookups in getUserActiv…#7
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…ityData getUserActivityData() was calling .find() on four arrays and .filter() on a fifth inside a .map() over up to 500 users, producing O(users × entries) CPU usage that scaled catastrophically. Pre-index each result array into a Map keyed by userId so every per-user lookup is O(1). https://claude.ai/code/session_01R9UxmCEUgGCK58iJpMhuBY
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getUserActivityData() was calling .find() on four arrays and .filter() on a fifth inside a .map() over up to 500 users, producing O(users × entries) CPU usage that scaled catastrophically. Pre-index each result array into a Map keyed by userId so every per-user lookup is O(1).