{
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      "dedup_key": "precipitation:2026-03-10",
      "alert_type": "precipitation",
      "sent_at": "2026-03-09T20:01:04.687100",
      "forecast_hour": "2026-03-10-00"
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  "previous_alert_snapshots": {
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      "extreme_value": 83.0,
      "threshold": 60,
      "start_time": "2026-03-10-09",
      "end_time": "2026-03-10-12",
      "hour_count": 4,
      "captured_at": "2026-03-10T08:01:04.226380"
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  "last_ai_summary_sent": null
}