{
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    "precipitation:2026-02-03": {
      "dedup_key": "precipitation:2026-02-03",
      "alert_type": "precipitation",
      "sent_at": "2026-02-03T16:01:03.145892",
      "forecast_hour": "2026-02-03-20"
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  "last_updated": "2026-02-03T20:01:04.979025",
  "previous_alert_snapshots": {
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      "alert_type": "precipitation",
      "extreme_value": 94.0,
      "threshold": 60,
      "start_time": "2026-02-03-21",
      "end_time": "2026-02-04-00",
      "hour_count": 4,
      "captured_at": "2026-02-03T20:01:04.979020"
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  "last_ai_summary_sent": null
}