System Design Patterns: From Fundamentals to Real Systems
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LLM Gateway

1. The Incident

Eighteen months of AI enthusiasm, and the store now has fourteen services calling model providers directly: the assistant, search, summarization, three agent experiments, a fraud explainer, and eight things nobody has inventoried. The bills arrive together, as they always do:

  • A key leaks. A provider API key, embedded in a client bundle by a well-meaning team, shows up on a paste site. Rotation means finding every place it is used (fourteen services, three languages, unknown copies) and redeploying each

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