refactor(rollups): evaluate own-property iteration without key arrays

[seonghobae]

Current boundary

• protected base: developmental@2fa92012bcf80acc1f921a4bafea76b3b1424b46
• exact head: f348e6d1f932a2318d7e9303d00e3f15f56c2f75
• lifecycle: Draft / structural refactor present / representative performance evidence missing

The production candidate replaces selected Object.keys(obj) loops in daily/weekly rollup aggregation with for...in guarded by Object.hasOwn(obj, key). That structurally avoids materializing a keys array at those call sites. It does not by itself establish faster buyer-facing report generation, lower p95, lower CPU, or material GC/heap improvement on the supported Node/V8 runtime.

f348e6d1f932a2318d7e9303d00e3f15f56c2f75 restores .jules/bolt.md byte-for-byte to protected blob 57daf4712f8a58203eab836b9b8e209b6bad1ab9. An unmeasured refactor must not create repository-wide doctrine that for...in is generally preferable to Object.keys().

Scope debt

The current comparison still contains unrelated root dependency updates (package.json, pnpm-lock.yaml) for Browserslist/DeepmergeTS. Those are not performance evidence for this refactor and must not be silently discarded: dependency lane #525 already owns the transitive security/compatibility problem but currently carries its own mixed-scope debt. Reconcile the dependency generations through that owner path first; after the valid dependency delta reaches protected ancestry, restack this branch by ordinary descendant so the rollup PR contains only its own semantic/test/evidence delta.

Acceptance before Ready/merge

1. Preserve exact aggregation results for skill counts, agent counts, model tokens, total calls and weekly distinct-skill semantics, including objects with inherited enumerable properties; prove caller inputs are not mutated.
2. If performance remains the merge rationale, compare protected and candidate implementations on representative/right-cleared daily and weekly rollup shapes under the same supported Node/V8/runtime/CPU. Record cardinality, warm-up policy, repeated median/p95, CPU profile, allocations/heap and GC.
3. Measure the buyer-facing daily/weekly report path where applicable. A source-level allocation observation is not evidence that the fleet p95≤20ms target improved.
4. If the controlled comparison is neutral or worse, prefer the simpler protected implementation rather than retaining extra for...in/hasOwn complexity as an assumed optimization.
5. Reconcile the dependency delta through fix(security): patch transitive deepmerge-ts stack exhaustion #525, then require all applicable CI/Security/SAST/CodeQL checks and qualifying independent review on one unchanged exact descendant.

No force push, destructive rebase, self-approval, scanner suppression, source-neutral retrigger, predecessor-GREEN transfer, or gate weakening is acceptance evidence.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 3444c2fc-4497-4660-863a-9ac049cc07e4

📥 Commits

Reviewing files that changed from the base of the PR and between cceb5f1 and 73451d9.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (1)

• package.json

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

일일 및 주간 집계 루프를 for...in과 Object.hasOwn() 방식으로 변경했습니다. browserslist와 deepmerge-ts 버전을 고정했습니다. 기존 집계 결과는 유지됩니다.

Changes

집계 순회 최적화

Layer / File(s)	Summary
집계 핫 패스 순회 변경 packages/web/src/lib/server/daily-rollup.ts, packages/web/src/lib/server/weekly-report.ts, .jules/bolt.md	skillCounts, agentCounts, modelTokens 순회를 Object.keys() 기반 방식에서 for...in과 Object.hasOwn() 검증 방식으로 변경했습니다. 기존 합산 결과는 유지됩니다. 변경 원칙을 학습 기록에 추가했습니다.

패키지 버전 고정

Layer / File(s)	Summary
패키지 오버라이드 추가 package.json	pnpm overrides에 browserslist 4.28.9와 deepmerge-ts 8.0.2를 추가했습니다.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 8a6ab

Daily and weekly rollup aggregation avoids temporary key-array allocations while preserving own-property counting behavior, and the pinned dependency configuration is reflected in the lockfile. No merge-blocking risk is evident.

Suggested reviewers: claude

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	제목은 rollups 리팩터링과 Object.keys() 배열 할당을 제거하기 위한 own-property 순회 검토를 명확하게 설명합니다. 변경 내용과 직접 관련되며 간결합니다.

Full details: Docstring Coverage

Explanation

Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (1 skipped: 1 unsupported.)

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jules-3197975644067938090-fd9daaa2

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