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<div style="display: none; max-height: 0px; overflow: hidden;">OpenAI scaled PostgreSQL to support 800 million ChatGPT users and millions of queries per second for its predominantly read-heavy workloads </div>
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<h1><strong> TLDR Dev <span id="date">2026-01-23</span></strong></h1>
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<strong>Scaling PostgreSQL to power 800 million ChatGPT users (14 minute read)</strong>
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OpenAI scaled PostgreSQL to support 800 million ChatGPT users and millions of queries per second for its predominantly read-heavy workloads. To achieve this, its team offloaded write-heavy operations to sharded systems like Azure Cosmos DB and implemented application and query optimizations. Their architecture uses a single primary Azure PostgreSQL instance and nearly 50 global read replicas.
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A developer building a high-performance SSH game found that a single keystroke generated over 100 small packets. The root cause was identified as OpenSSH's keystroke timing obfuscation feature, which sends "chaff" packets to disguise typing patterns. By patching Go's SSH library to disable the `ping@openssh.com` extension server-side, the developer achieved a dramatic >50% reduction in CPU and bandwidth. LLMs assisted in the debugging process.
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Remotion Agent Skills allow videos to be made programmatically with coding agents like Claude Code.
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Townie v5 is an AI agent powered by Claude 4.5 designed to integrate directly into the browser alongside the code editor. The agent can perform nearly any action a user can, including managing code, files, versions, and databases, allowing for the rapid scaffolding of features or full-stack applications.
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Modal runs a globally distributed pool of over 20,000 GPUs across multiple cloud providers. Its approach begins with instance type testing and selection, evaluating performance and reliability differences between cloud hyperscalers. This is followed by machine image preparation and automated boot checks to guarantee GPU health before customer workloads begin. Throughout an instance's life, Modal performs continuous passive and active healthchecking.
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<h1><strong>Quick Links</strong></h1>
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