{
  "sent_alerts": {
    "precipitation:2026-04-18": {
      "dedup_key": "precipitation:2026-04-18",
      "alert_type": "precipitation",
      "sent_at": "2026-04-18T20:01:03.890744",
      "forecast_hour": "2026-04-18-22"
    }
  },
  "last_updated": "2026-04-18T20:01:03.890790",
  "previous_alert_snapshots": {
    "precipitation": {
      "alert_type": "precipitation",
      "extreme_value": 89.0,
      "threshold": 60,
      "start_time": "2026-04-18-22",
      "end_time": "2026-04-19-00",
      "hour_count": 3,
      "captured_at": "2026-04-18T20:01:03.890771"
    }
  },
  "last_ai_summary_sent": null
}