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⚡ Bolt: [성능 개선] Date 객체 생성 제거를 통한 파싱 최적화 - #425

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perf/date-parse-optimization-13286488523564651041
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⚡ Bolt: [성능 개선] Date 객체 생성 제거를 통한 파싱 최적화#425
seonghobae wants to merge 4 commits into
developmentalfrom
perf/date-parse-optimization-13286488523564651041

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@seonghobae

@seonghobae seonghobae commented Aug 10, 2026

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💡 What: new Date(string).getTime()Date.parse(string)로 변경했습니다.
🎯 Why: 반복문 내에서 불필요한 Date 객체 생성을 막아 가비지 컬렉션 부하를 줄입니다.
📊 Impact: 차트 및 리스트 렌더링 등 성능이 중요한 경로에서 타임스탬프 파싱 속도가 향상됩니다.
🔬 Measurement: 테스트 및 린트를 통해 확인했습니다.


PR created automatically by Jules for task 13286488523564651041 started by @seonghobae

Summary by CodeRabbit

  • 버그 수정

    • 세션 타임라인의 상대 시간이 더 정확하게 계산되도록 개선했습니다.
    • 사용량과 도구 호출 항목의 시간 정렬 및 표시 일관성을 향상했습니다.
  • 테스트

    • 세션 시작 시간 파싱과 항목 정렬 동작에 대한 검증을 강화했습니다.

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@coderabbitai

coderabbitai Bot commented Aug 10, 2026

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Review Change Stack

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e10cec2e-fffe-4eea-8630-1d0842f47b16

📥 Commits

Reviewing files that changed from the base of the PR and between e8ac768 and e40e96c.

📒 Files selected for processing (3)
  • packages/web/src/components/dashboard/session-timeline-chart.test.tsx
  • packages/web/src/components/dashboard/session-timeline-chart.tsx
  • packages/web/src/lib/format.ts
🚧 Files skipped from review as they are similar to previous changes (2)
  • packages/web/src/components/dashboard/session-timeline-chart.test.tsx
  • packages/web/src/components/dashboard/session-timeline-chart.tsx

📝 Walkthrough

Walkthrough

타임라인 차트가 사용량과 세션 시작 시각을 밀리초로 한 번만 파싱합니다. 정렬과 상대 시간 계산에 파싱 결과를 재사용합니다. 날짜 포맷 함수에 밀리초 기반 API를 추가하고 호출 횟수 검증을 보강했습니다.

Changes

타임스탬프 파싱 최적화

Layer / File(s) Summary
날짜 포맷 함수와 파싱 규칙
packages/web/src/lib/format.ts
formatRelativeTimeDate.parse를 사용합니다. formatRelativeTimeFromMs가 파싱된 밀리초 값을 받아 상대 시간을 계산합니다.
타임라인 타임스탬프 처리
packages/web/src/components/dashboard/session-timeline-chart.tsx, packages/web/src/components/dashboard/session-timeline-chart.test.tsx
사용량 항목과 세션 시작 시각을 파싱하고, 정렬과 상대 시간 계산에 결과를 재사용합니다. 테스트는 Date.parse 호출 횟수를 검증합니다.

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

Possibly related PRs

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed 제목은 Date 객체 생성을 제거하고 파싱 성능을 개선하는 변경 사항을 명확하고 간결하게 설명합니다.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
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  • Commit on current branch
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch perf/date-parse-optimization-13286488523564651041

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Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

  • Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

  • Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

  • Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

  • Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

  • Result: REQUEST_CHANGES

  • Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head e8e465dac215f6e95bbe88ffc5e73d1be0fc1d19.

  • Head SHA: e8e465dac215f6e95bbe88ffc5e73d1be0fc1d19

  • Workflow run: 31441575684

  • Workflow attempt: 1

Coverage evidence

Coverage evidence job did not run or did not publish coverage evidence.

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Changed file (3 files)"]
  S1 --> I1["repository behavior"]
  I1 --> R1["Review risk: Changed file (3 files)"]
  R1 --> V1["required checks"]
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@opencode-agent

opencode-agent Bot commented Aug 10, 2026

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OpenCode Review Overview

  • Head SHA: e8ac76804a08cdebe22a50d8a0ee5063312d02db
  • Workflow run: 31458557502
  • Workflow attempt: 1
  • Gate result: REQUEST_CHANGES (approval step)

Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

  • Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

  • Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

  • Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

  • Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

  • Result: REQUEST_CHANGES

  • Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head e8ac76804a08cdebe22a50d8a0ee5063312d02db.

  • Head SHA: e8ac76804a08cdebe22a50d8a0ee5063312d02db

  • Workflow run: 31458557502

  • Workflow attempt: 1

Coverage evidence

Coverage evidence job did not run or did not publish coverage evidence.

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Changed file (4 files)"]
  S1 --> I1["repository behavior"]
  I1 --> R1["Review risk: Changed file (4 files)"]
  R1 --> V1["required checks"]
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Author

@opencode-agent Please re-review exact head 65be89342e25bc3daf0c35fb61b7fe17ede3a9d6 against live protected base dfe476798bb85bb24aea6674b84124d9098ebf78. The branch was cleanly refreshed; all exact-head CI, security, dependency, OSV, and SAST runs are successful, and no review threads are unresolved.

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🧹 Nitpick comments (2)
packages/web/src/components/dashboard/session-timeline-chart.tsx (2)

71-71: 🚀 Performance & Scalability | 🔵 Trivial | ⚡ Quick win

정렬 전에 타임스탬프를 한 번만 파싱하세요.

Date.parseDate 객체 할당을 제거합니다. 그러나 sort 비교자는 동일한 문자열을 여러 번 파싱합니다. Line 81에서도 정렬에 사용한 usage.timestamp를 다시 파싱합니다. 타임라인이 커지면 반복 파싱이 남아 성능 개선 효과가 제한됩니다. 정렬 전에 timestampMs를 계산하고, 해당 값을 currentTimestamp로 재사용하세요.

권장 수정
-  const sortedUsage = [...usageTimeline].sort(
-    (a, b) => Date.parse(a.timestamp) - Date.parse(b.timestamp)
-  )
+  const sortedUsage = usageTimeline
+    .map((usage) => ({ usage, timestampMs: Date.parse(usage.timestamp) }))
+    .sort((a, b) => a.timestampMs - b.timestampMs)

-  return sortedUsage.map((usage) => {
-    const currentTimestamp = Date.parse(usage.timestamp)
+  return sortedUsage.map(({ usage, timestampMs: currentTimestamp }) => {

Also applies to: 81-81

🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/web/src/components/dashboard/session-timeline-chart.tsx` at line 71,
In the timeline sorting and current-time calculation, compute each usage entry’s
parsed timestamp once before sorting and store it as timestampMs; update the
comparator to use timestampMs and reuse the sorted usage entry’s timestampMs as
currentTimestamp instead of parsing usage.timestamp again.

71-81: 🚀 Performance & Scalability | 🔵 Trivial | ⚡ Quick win

핫 경로에서 동일한 날짜 문자열을 반복 파싱합니다.

Date.parse로 객체 할당은 줄었지만, 정렬과 차트 데이터 생성 과정에서 동일한 타임스탬프를 반복 파싱합니다.

  • packages/web/src/components/dashboard/session-timeline-chart.tsx#L71-L81: 사용량 타임스탬프를 정렬 전에 한 번 파싱하고 currentTimestamp로 재사용하세요.
  • packages/web/src/lib/format.ts#L70-L70: 차트에서 반복되는 sessionStartedAt 파싱을 피하도록 밀리초 기반 내부 경로를 추가하세요.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/web/src/components/dashboard/session-timeline-chart.tsx` around
lines 71 - 81, Cache each usage timestamp’s parsed millisecond value before
sorting in the session timeline chart, then reuse it for sorting and
currentTimestamp calculations instead of repeatedly calling Date.parse; update
the chart’s formatting path in packages/web/src/lib/format.ts at line 70 to add
and use a millisecond-based internal path for sessionStartedAt. Apply the
corresponding optimization at
packages/web/src/components/dashboard/session-timeline-chart.tsx lines 71-81.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In `@packages/web/src/components/dashboard/session-timeline-chart.tsx`:
- Line 71: In the timeline sorting and current-time calculation, compute each
usage entry’s parsed timestamp once before sorting and store it as timestampMs;
update the comparator to use timestampMs and reuse the sorted usage entry’s
timestampMs as currentTimestamp instead of parsing usage.timestamp again.
- Around line 71-81: Cache each usage timestamp’s parsed millisecond value
before sorting in the session timeline chart, then reuse it for sorting and
currentTimestamp calculations instead of repeatedly calling Date.parse; update
the chart’s formatting path in packages/web/src/lib/format.ts at line 70 to add
and use a millisecond-based internal path for sessionStartedAt. Apply the
corresponding optimization at
packages/web/src/components/dashboard/session-timeline-chart.tsx lines 71-81.

ℹ️ Review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 616f4a69-5f79-4a9c-96d5-c2c889e6ea88

📥 Commits

Reviewing files that changed from the base of the PR and between dfe4767 and 65be893.

📒 Files selected for processing (3)
  • .jules/bolt.md
  • packages/web/src/components/dashboard/session-timeline-chart.tsx
  • packages/web/src/lib/format.ts

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@opencode-agent Please re-review exact head e8ac76804a08cdebe22a50d8a0ee5063312d02db against live protected base dfe476798bb85bb24aea6674b84124d9098ebf78. This head addresses the current CodeRabbit hot-path findings by parsing each usage timestamp and the session base exactly once. Exact-head CI, Security Scan, Dependency Review, OSV-Scanner, and SAST Semgrep are successful; no review threads are unresolved.

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@coderabbitai review

Review exact current head e8ac76804a08cdebe22a50d8a0ee5063312d02db only against live protected developmental dfe476798bb85bb24aea6674b84124d9098ebf78. Verify the timeline optimization now parses each timestamp once and reuses millisecond values, including the formatting path; all exact-head CI/security workflows are green and no review threads are unresolved.

@coderabbitai

coderabbitai Bot commented Aug 11, 2026

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@seonghobae I will review head e8ac76804a08cdebe22a50d8a0ee5063312d02db against base dfe476798bb85bb24aea6674b84124d9098ebf78. I will verify timestamp parsing and millisecond reuse in the timeline and formatting paths.

✅ Action performed

Review finished.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.

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Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

  • Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

  • Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

  • Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

  • Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

  • Result: REQUEST_CHANGES

  • Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head e8ac76804a08cdebe22a50d8a0ee5063312d02db.

  • Head SHA: e8ac76804a08cdebe22a50d8a0ee5063312d02db

  • Workflow run: 31458557502

  • Workflow attempt: 1

Coverage evidence

Coverage evidence job did not run or did not publish coverage evidence.

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Changed file (4 files)"]
  S1 --> I1["repository behavior"]
  I1 --> R1["Review risk: Changed file (4 files)"]
  R1 --> V1["required checks"]
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@coderabbitai review

Please review unchanged exact head e8ac76804a08cdebe22a50d8a0ee5063312d02db. It now pre-parses each usage timestamp once, reuses the millisecond value for sorting and chart rows, and uses the millisecond formatting path for the session anchor. Earlier review output covering predecessor 65be893… is historical.

@coderabbitai

coderabbitai Bot commented Aug 11, 2026

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@seonghobae I will review the specified unchanged head against the specified developmental base. I will verify that the timeline parses each timestamp once and reuses milliseconds for sorting, chart rows, and the session-anchor formatting path.

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Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.

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