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PostgreSQL at Scale: Lessons from a Trading Platform

I've spent the better part of two years running PostgreSQL as the backbone of a high-throughput equities trading platform. Not a toy. Not a side project. A real system processing north of 30,000 transactions per second during peak market hours, managing an order book spanning thousands of instruments, and maintaining the kind of audit trail that keeps compliance people from having nightmares - and soon, MiFID II regulators satisfied.