just spent three days debugging why our transaction reconciliation was throwing mismatches at exactly 00:00 UTC and honestly i need to talk about this

Summary

turned out one of our upstream banking partners was still running a legacy system that rolled over their daily batch at midnight local time - which is fine - except they never documented that their timestamps were being converted to UTC after the batch closed, not before. so for about 11 minutes every night our internal ledger and their ledger were technically in different "days" and the reconciliation engine was losing its mind trying to match settlements that didnt exist yet on our s

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