From 2994b75dab60ded53b90c13c622f8af4fba70ec1 Mon Sep 17 00:00:00 2001
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Date: Sun, 5 Jul 2026 15:03:30 +0800
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 src/app/(main)/dashboard/page.tsx | 7 ++++---
 src/lib/types.ts                  | 2 ++
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/app/(main)/dashboard/page.tsx b/src/app/(main)/dashboard/page.tsx
index f0ab98c..af8fc5f 100644
--- a/src/app/(main)/dashboard/page.tsx
+++ b/src/app/(main)/dashboard/page.tsx
@@ -118,9 +118,10 @@ function previousPeriodRange(range: ReturnType<typeof periodRange>) {
 }
 
 function retentionTitle(period: PeriodKey) {
-  if (period === '7d') return '近 7 日新增留存';
-  if (period === '30d') return '近 30 日新增留存';
-  return '昨日新增留存';
+  // 次日留存口径(2026-07-05):每天取前一日新增用户,统计其当日活跃比例;单日窗口即「前日新增的昨日留存」。
+  if (period === '7d') return '近 7 日新增次日留存';
+  if (period === '30d') return '近 30 日新增次日留存';
+  return '前日用户新增留存';
 }
 
 function avgEcpm(report: AdRevenueReport | null) {
diff --git a/src/lib/types.ts b/src/lib/types.ts
index c0e6a80..11b8806 100644
--- a/src/lib/types.ts
+++ b/src/lib/types.ts
@@ -533,6 +533,8 @@ export interface DashboardOverview {
       new: number;
       active: number;
       retained_new_users: number;
+      // 次日留存基数:窗口内逐日「前一日新增用户数」之和(retention_rate 的分母;旧后端无此字段)
+      retention_cohort?: number;
       retention_rate: number | null;
       retention_note: string;
     };