{
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      "dedup_key": "precipitation:2026-04-05",
      "alert_type": "precipitation",
      "sent_at": "2026-04-05T00:01:04.181335",
      "forecast_hour": "2026-04-05-02"
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  "last_updated": "2026-04-05T04:01:10.422814",
  "previous_alert_snapshots": {
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      "extreme_value": 97.0,
      "threshold": 60,
      "start_time": "2026-04-05-05",
      "end_time": "2026-04-05-08",
      "hour_count": 4,
      "captured_at": "2026-04-05T04:01:10.422811"
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  "last_ai_summary_sent": null
}