⚡ Bolt: [Async PBKDF2 hashing]

[seonghobae]

💡 What:
hash_api_key 함수 내부의 동기적 PBKDF2 해싱을 asyncio.to_thread를 통해 별도의 스레드 풀로 오프로드하고, 함수를 async def로 변경하여 모든 호출부에서 await하도록 수정했습니다.

🎯 Why:
PBKDF2-HMAC-SHA256 해싱은 21만 번의 반복을 수행하는 CPU 집약적인 작업으로, 동기적으로 실행될 경우 약 180~200ms 동안 비동기 이벤트 루프 전체를 멈추게 합니다. 인증과 같은 자주 호출되는 핫 패스에서 이러한 루프 차단이 발생하면 다른 요청의 처리가 모두 지연되므로, 이를 비동기화하여 전체 애플리케이션의 응답성과 처리량을 확보하기 위함입니다.

📊 Measured Improvement:
로컬 벤치마크 결과, 0.01초 단위로 측정하는 이벤트 루프 티커(ticker) 기준으로:

• 최적화 전: 해싱 도중 이벤트 루프가 완전히 차단되어(약 0.18s) 티커가 0번 실행됨.
• 최적화 후: 해싱이 스레드 풀로 오프로드되어(약 0.18s) 이벤트 루프가 정상 동작하며 티커가 약 17번 실행됨.
  이를 통해 무거운 연산 중에도 이벤트 루프가 정상적으로 동작함을 확인했습니다.

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PR created automatically by Jules for task 14919484376266355480 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between 72afe6d and 89c65eb.

📒 Files selected for processing (6)

• .jules/bolt.md
• backend/app/api/api_keys.py
• backend/app/auth.py
• backend/tests/test_api_keys.py
• backend/tests/test_auth_security.py
• backend/tests/test_csrf_middleware.py

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