Node.js Расписание для ежедневной электронной почты — Примеры облачного крона с состоянием повторной попытки

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Node.js Schedule for Daily Email — Cloud Cron Examples with Retry State

Short answer: use cloud cron to create one idempotent daily run, then let a durable queue and leased Node.js workers drain the email jobs with bounded retries. A daily report email is easy to trigger and surprisingly hard to finish reliably. The schedule is only the first event. The real system has to drain a rate-limited worker pool, survive a timeout after the mail provider accepted a message, and avoid sending the same report twice. My default design is a thin cloud cron trigger that enqueu