Add session-aware prefix caching and /v1/stats endpoint - #199
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Aug 26, 2026
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- X-Session-ID header enables KV cache reuse across requests in the same conversation (engine's TokenHistory detects prefix overlap)
- GET /v1/stats returns JSON metrics: throughput, prefix hit rate, memory
- Remove unconditional engine.reset() from chat path — let the engine handle prefix detection internally for 10-20x TTFT improvement on multi-turn conversations
- Completions endpoint retains reset (lm-eval sends unrelated prompts)
- X-Session-ID header enables KV cache reuse across requests in the same conversation (engine's TokenHistory detects prefix overlap) - GET /v1/stats returns JSON metrics: throughput, prefix hit rate, memory - Remove unconditional engine.reset() from chat path — let the engine handle prefix detection internally for 10-20x TTFT improvement on multi-turn conversations - Completions endpoint retains reset (lm-eval sends unrelated prompts)
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