{
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      "dedup_key": "precipitation:2026-03-07",
      "alert_type": "precipitation",
      "sent_at": "2026-03-07T20:01:03.817050",
      "forecast_hour": "2026-03-07-22"
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    "precipitation:2026-03-08": {
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      "alert_type": "precipitation",
      "sent_at": "2026-03-08T00:01:04.538166",
      "forecast_hour": "2026-03-08-01"
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  "last_updated": "2026-03-08T08:01:04.517564",
  "previous_alert_snapshots": {},
  "last_ai_summary_sent": null
}