Rate-Limited Worker Queues for Timezone-Aware User Reminders in Node.js
Short answer: treat local calendar time as schedule data, store the next due instant in UTC, and let a short dispatcher feed a rate-limited worker pool. For an edtech reminder service serving US and EU users, this keeps daily and weekly notifications aligned through DST while making queue pressure and duplicate delivery measurable. The scheduler is not the delivery system. It is a checkpoint that…
The article discusses a system for scheduling local calendar time in Node.js, focusing on timezone-aware user reminders. It emphasizes storing local time, weekday, and a reminder ID while using UTC for next_run_at. The scheduler's role is to determine what is due, separate from the delivery system, which handles rate limits. The article also addresses challenges posed by daylight saving time (DST), such as skipped or duplicate times, and suggests policies for handling these situations.
It highlights the importance of separating the recurring rule from the dispatch cursor to maintain user preferences and provides a Go code example for implementing this scheduling system.
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