It was Monday morning when our analytics team started noticing something wrong. Customer transaction volumes had apparently skyrocketed over the weekend, up 4,700% according to the dashboards. Impossible numbers were everywhere. Our fraud detection system was flagging thousands of suspicious patterns. The executive team was already asking questions.
I pulled up the logs with a sinking feeling. Sure enough, our production data pipeline had processed Saturday’s data not once, not twice, but 47 times between Saturday afternoon and Monday…

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