UUIDv4 Is Not Free: Why Random Primary Keys Are Silently Crushing Your Write Performance

<p>When my database write latency spiked by 340% after crossing 50 million rows, my CPU wasn't maxed out. My queries weren't missing indexes. Instead, my storage IOPS was completely saturated by a single architectural default I set up on day one: using <code>UUIDv4</code> as my primary key.</p> <p>Most backend engineers avoid auto-incrementing integers (<code>BIGINT</code> / <code>SERIAL</code>) i

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