diff --git a/apps/control-center/src/server/services/social-attribution-boundary.test.ts b/apps/control-center/src/server/services/social-attribution-boundary.test.ts
new file mode 100644
index 000000000..63b844102
--- /dev/null
+++ b/apps/control-center/src/server/services/social-attribution-boundary.test.ts
@@ -0,0 +1,59 @@
+import { describe, expect, it } from 'vitest';
+
+import {
+  computePostActivity,
+  type AttributionObservation,
+  type SnapshotInterval,
+} from './social-attribution.js';
+
+const interval: SnapshotInterval = {
+  platform: 'x',
+  startAt: '2026-08-01T00:00:00.000Z',
+  endAt: '2026-08-01T03:00:00.000Z',
+  followersStart: 10,
+  followersEnd: 14,
+};
+
+describe('social attribution interval boundaries', () => {
+  it('does not leak a future observation into the current interval', () => {
+    expect(
+      computePostActivity({
+        interval,
+        post: {
+          id: 'post-1',
+          platform: 'x',
+          published_at: '2026-07-31T20:00:00.000Z',
+        },
+        observations: [
+          observation(interval.startAt, 100),
+          observation(interval.endAt, 140),
+          observation('2026-08-01T04:00:00.000Z', 1_000),
+        ],
+      }),
+    ).toMatchObject({
+      postId: 'post-1',
+      deltaReach: 40,
+    });
+  });
+});
+
+function observation(
+  captured_at: string,
+  views: number,
+): AttributionObservation {
+  return {
+    social_post_id: 'post-1',
+    captured_at,
+    age_hours: 1,
+    measurement_window: null,
+    collection_status: 'collected',
+    views,
+    impressions: null,
+    likes: null,
+    comments: null,
+    shares: null,
+    saves: null,
+    profile_visits: null,
+    followers_gained: null,
+  };
+}
diff --git a/apps/control-center/src/server/services/social-growth-window-filter.test.ts b/apps/control-center/src/server/services/social-growth-window-filter.test.ts
new file mode 100644
index 000000000..93f6da2b1
--- /dev/null
+++ b/apps/control-center/src/server/services/social-growth-window-filter.test.ts
@@ -0,0 +1,123 @@
+import type { createClient } from '@supabase/supabase-js';
+import { describe, expect, it } from 'vitest';
+
+import { readControlCenterConfig } from '../config/env.js';
+import { loadSocialGrowth } from './social-growth.js';
+
+const NOW = new Date('2026-09-11T00:00:00.000Z');
+const CONFIGURED = readControlCenterConfig({
+  SUPABASE_URL: 'https://example.supabase.co',
+  SUPABASE_SERVICE_ROLE_KEY: 'service-role-key',
+});
+
+describe('loadSocialGrowth standardized metric windows', () => {
+  it('does not let later 72h metrics inflate the 24h experiment sample', async () => {
+    const posts = [
+      {
+        id: 'post-1',
+        episode_id: 'episode-1',
+        platform: 'threads',
+        language_code: 'ja',
+        published_at: '2026-09-10T00:00:00.000Z',
+        experiment_key: 'window-v1',
+        experiment_variant: 'control',
+        content_features: null,
+      },
+    ];
+    const metrics = [
+      metric('24h', '2026-09-11T00:00:00.000Z', 100, 10),
+      metric('72h', '2026-09-13T00:00:00.000Z', 9_999, 999),
+    ];
+
+    const response = await loadSocialGrowth({
+      config: CONFIGURED,
+      now: NOW,
+      createSupabaseClient: clientFactory({ posts, metrics }),
+    });
+
+    const experiment = response.experiments.find(
+      (row) => row.experimentKey === 'window-v1',
+    );
+    const arm = experiment?.arms.find((row) => row.variant === 'control');
+
+    expect(response.status).toBe('ok');
+    expect(arm).toMatchObject({
+      samples24h: 1,
+      medianReach24h: 100,
+      meanReach24h: 100,
+      medianEngagementRate: 0.1,
+    });
+  });
+});
+
+function metric(
+  measurementWindow: string,
+  capturedAt: string,
+  views: number,
+  likes: number,
+) {
+  return {
+    social_post_id: 'post-1',
+    captured_at: capturedAt,
+    age_hours: measurementWindow === '24h' ? 24 : 72,
+    measurement_window: measurementWindow,
+    collection_status: 'collected',
+    views,
+    impressions: null,
+    likes,
+    comments: 0,
+    shares: 0,
+    saves: 0,
+    profile_visits: null,
+    followers_gained: null,
+  };
+}
+
+function clientFactory(input: {
+  posts: Array<Record<string, unknown>>;
+  metrics: ReturnType<typeof metric>[];
+}) {
+  const client = {
+    from(table: string) {
+      const rows =
+        table === 'social_posts'
+          ? input.posts
+          : table === 'social_post_metrics'
+            ? input.metrics
+            : [];
+      const chain = {
+        select() {
+          return chain;
+        },
+        gte() {
+          return chain;
+        },
+        lte() {
+          return chain;
+        },
+        not() {
+          return chain;
+        },
+        eq() {
+          return chain;
+        },
+        order() {
+          return chain;
+        },
+        limit() {
+          return Promise.resolve({ data: rows, count: rows.length, error: null });
+        },
+        then(resolve: (value: { data: typeof rows; count: number; error: null }) => unknown) {
+          return Promise.resolve({ data: rows, count: rows.length, error: null }).then(
+            resolve,
+          );
+        },
+      };
+      return chain;
+    },
+    schema() {
+      return client;
+    },
+  };
+  return (() => client) as unknown as typeof createClient;
+}
diff --git a/scripts/check-social-release-contract.mjs b/scripts/check-social-release-contract.mjs
index e23a83cd3..10a3609b5 100644
--- a/scripts/check-social-release-contract.mjs
+++ b/scripts/check-social-release-contract.mjs
@@ -23,7 +23,7 @@ const languageAllocation = read(
 );
 const readme = read('apps/podcast-pipeline/src/social/README.md');
 const growthView = read(
-  'apps/control-center/src/client/components/GrowthView.tsx',
+  'apps/control-center/src/client/pages/GrowthPage.tsx',
 );
 const recovery = read(
   'apps/podcast-pipeline/src/social/release-cohort-store.ts',