<p>Short answer: put each user reminder on a queue, make the consumer idempotent, retry transient delivery failures with backoff, and move exhausted work to a dead-letter queue
<p>It is 2 a.m. The on-call engineer's phone buzzes. They glance at it, recognize the same alert they have seen forty times this week, and swipe it away. Every single time before
<blockquote> <p><strong>TL;DR:</strong> The failure mode nobody warns you about with Raspberry Pi clusters: the service dies, you SSH in twenty minutes later, and
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