{
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      "dedup_key": "precipitation:2026-04-28",
      "alert_type": "precipitation",
      "sent_at": "2026-04-28T04:01:04.095318",
      "forecast_hour": "2026-04-28-07"
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  "previous_alert_snapshots": {
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      "extreme_value": 91.0,
      "threshold": 60,
      "start_time": "2026-04-28-07",
      "end_time": "2026-04-28-08",
      "hour_count": 2,
      "captured_at": "2026-04-28T04:01:04.095338"
    }
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  "last_ai_summary_sent": null
}