{
  "id": 19408505,
  "title": "Common Causes of Delayed or Missed User Reminders: Replaceable Cron Delivery",
  "url": "https://urgent.news/2026/11/10/common-causes-of-delayed-or-missed-user-reminders-replaceable-cron",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-11-10T22:45:47.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/langstonhughes2689/common-causes-of-delayed-or-missed-user-reminders-replaceable-cron-delivery-2en6"
  },
  "original_language": "en",
  "account": null,
  "summary": "The article discusses the common causes of delayed or missed user reminders, specifically focusing on replaceable cron delivery. It identifies three main failure boundaries: a paused cron job that does not backfill missed triggers, an unavailable public callback due to an internal hostname or private network address, and a 900-second timeout limit for a single cron execution. To address these issues, the author suggests keeping the cleanup trigger, durable message, and user-facing delivery behind replaceable boundaries. The recommended solution involves using a queue plus a realtime channel, ensuring idempotency, and employing a stable idempotency key for retrying deliveries. The author also highlights the importance of splitting the cleanup sweep into queue messages to make the process retryable while emphasizing the need for a clear contract between the cleanup sweep, queue, and realtime delivery.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}