{ "timestamp": "2026-08-10T20:42:00Z", "node_id": "NODE_ENTRANCE_NORTH_02", "zone_dimensions": { "area_sqm": 45.0 }, "metrics": { "count": 86, "density_p_m2": 1.91, "inflow_ppm": 120, "outflow_ppm": 75, "avg_velocity_m_s": 0.38 }, "status": { "los_grade": "E", "ici_score": 0.78, "shockwave_detected": true, "alert_level": "ORANGE" } }