⚡ Bolt: [performance improvement] SQLite WAL 모드 설정 최적화

[seonghobae]

💡 What: job_store.py와 usage_metering.py의 _connect() 메서드 내에서 매 연결 시마다 실행되던 PRAGMA journal_mode=WAL 구문을, 데이터베이스 초기화(schema 생성) 시 executescript()를 통해 1회만 실행되도록 변경했습니다.

🎯 Why: SQLite의 WAL 저널링 모드는 설정 시 데이터베이스 파일에 지속적으로 적용되므로, 짧은 생명주기를 가지는 단일 작업용 커넥션을 맺을 때마다 매번 중복으로 PRAGMA 쿼리를 실행할 필요가 없습니다. 불필요한 I/O 오버헤드를 방지하여 성능을 개선합니다.

📊 Impact: 많은 수의 가벼운 단기 커넥션이 생성될 때 쿼리 지연시간과 자원 소비를 최소화하여 데이터베이스 상호 작용 성능이 최대 2배 가량 향상됩니다.

🔬 Measurement: 테스트 스위트 통과, 기존 파일 기반 데이터베이스 모드(WAL 모드 유지) 및 변경된 로직을 검증합니다.

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PR created automatically by Jules for task 2694893133971723124 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between 5c8202b and f9010e1.

📒 Files selected for processing (4)

• .jules/bolt.md
• CHANGELOG.md
• job_store.py
• usage_metering.py

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