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Computes for the Manager At-Risk heatmap (Phase 4 tablet redesign). Non-stored — recomputed on /fp/manager/at_risk read; that endpoint caches its full payload for 60s so the cost is bounded. bottleneck_score = active_step_count * avg_wait_minutes avg_wait_minutes = rolling-7-day avg of (date_started - create_date) Work centres with high score show red in the heatmap — combination of queue length AND average wait time. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>