⚡ Bolt: 일일 롤업(daily rollup) 메모리 할당 최적화

[seonghobae]

💡 What: 루프 내부의 Object.entries를 Object.keys로 교체하고 배열 변환을 지연시켰습니다.
🎯 Why: 높은 트래픽을 처리하는 배경 배치 작업에서 튜플 배열 할당과 중첩 루프 내 빈번한 Set/Map 생성으로 인한 성능 저하를 방지하기 위함입니다.
📊 Impact: 가비지 컬렉션(GC) 부하가 줄고 대규모 데이터 집계 성능이 향상될 것으로 예상됩니다.
🔬 Measurement: 동일 데이터 볼륨에서 리포트 생성 및 롤업 생성 속도를 측정하여 확인할 수 있습니다.

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PR created automatically by Jules for task 9191980719084263157 started by @seonghobae

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