diff --git a/src/activity-data.ts b/src/activity-data.ts
index 0fb7d52..ea406d8 100644
--- a/src/activity-data.ts
+++ b/src/activity-data.ts
@@ -20,94 +20,58 @@ export type PeriodOption = {
   buckets: readonly ActivityBucket[]
 }
 
+const ACTIVITY_BUCKET_METADATA = [
+  {
+    kind: 'pull-request',
+    label: 'Pull request',
+    shortLabel: 'PR',
+    color: '#007da5',
+    radius: 1.2,
+    description: '변경 제안과 병합 준비 흐름',
+  },
+  {
+    kind: 'issue',
+    label: '이슈',
+    shortLabel: '이슈',
+    color: '#4f8f32',
+    radius: 1.8,
+    description: '논의 중인 문제와 개선 요청',
+  },
+  {
+    kind: 'commit',
+    label: '커밋',
+    shortLabel: '커밋',
+    color: '#c4457c',
+    radius: 2.45,
+    description: '저장소에 반영된 코드 변화',
+  },
+  {
+    kind: 'review',
+    label: '리뷰',
+    shortLabel: '리뷰',
+    color: '#b77900',
+    radius: 3,
+    description: '변경을 검토하고 판단한 기록',
+  },
+] as const satisfies readonly Omit<ActivityBucket, 'count'>[]
+
+const createPeriodBuckets = (counts: Record<ActivityKind, number>): readonly ActivityBucket[] =>
+  ACTIVITY_BUCKET_METADATA.map((bucket) => ({ ...bucket, count: counts[bucket.kind] }))
+
 export const PERIOD_OPTIONS = [
   {
     mode: 'week',
     buttonLabel: '이번 주',
     metricLabel: '주간',
     insight: '커밋 밀도가 높고, 이슈 대응 궤도가 두 번째로 활발합니다.',
-    buckets: [
-      {
-        kind: 'pull-request',
-        label: 'Pull request',
-        shortLabel: 'PR',
-        count: 18,
-        color: '#007da5',
-        radius: 1.2,
-        description: '변경 제안과 병합 준비 흐름',
-      },
-      {
-        kind: 'issue',
-        label: '이슈',
-        shortLabel: '이슈',
-        count: 31,
-        color: '#4f8f32',
-        radius: 1.8,
-        description: '논의 중인 문제와 개선 요청',
-      },
-      {
-        kind: 'commit',
-        label: '커밋',
-        shortLabel: '커밋',
-        count: 74,
-        color: '#c4457c',
-        radius: 2.45,
-        description: '저장소에 반영된 코드 변화',
-      },
-      {
-        kind: 'review',
-        label: '리뷰',
-        shortLabel: '리뷰',
-        count: 12,
-        color: '#b77900',
-        radius: 3,
-        description: '변경을 검토하고 판단한 기록',
-      },
-    ],
+    buckets: createPeriodBuckets({ 'pull-request': 18, issue: 31, commit: 74, review: 12 }),
   },
   {
     mode: 'month',
     buttonLabel: '이번 달',
     metricLabel: '월간',
     insight: '이슈와 커밋 궤도가 넓게 쌓여 장기 흐름 비교에 적합합니다.',
-    buckets: [
-      {
-        kind: 'pull-request',
-        label: 'Pull request',
-        shortLabel: 'PR',
-        count: 52,
-        color: '#007da5',
-        radius: 1.2,
-        description: '변경 제안과 병합 준비 흐름',
-      },
-      {
-        kind: 'issue',
-        label: '이슈',
-        shortLabel: '이슈',
-        count: 86,
-        color: '#4f8f32',
-        radius: 1.8,
-        description: '논의 중인 문제와 개선 요청',
-      },
-      {
-        kind: 'commit',
-        label: '커밋',
-        shortLabel: '커밋',
-        count: 164,
-        color: '#c4457c',
-        radius: 2.45,
-        description: '저장소에 반영된 코드 변화',
-      },
-      {
-        kind: 'review',
-        label: '리뷰',
-        shortLabel: '리뷰',
-        count: 41,
-        color: '#b77900',
-        radius: 3,
-        description: '변경을 검토하고 판단한 기록',
-      },
-    ],
+    buckets: createPeriodBuckets({ 'pull-request': 52, issue: 86, commit: 164, review: 41 }),
   },
 ] as const satisfies readonly PeriodOption[]