init ana page with apis

app/api/stats/repository.ts

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+import { executeQuerySingle } from '@/lib/clickhouse';
+import { StatsOverview } from '../types';
+
+/**
+ * Get overview statistics for links
+ */
+export async function findStatsOverview(): Promise<StatsOverview | null> {
+  const query = `
+    WITH 
+      toUInt64(count()) as total_links,
+      toUInt64(countIf(is_active = true)) as active_links
+    FROM links
+    SELECT
+      total_links as totalLinks,
+      active_links as activeLinks,
+      (SELECT count() FROM link_events) as totalVisits,
+      (SELECT count() FROM link_events) / NULLIF(total_links, 0) as conversionRate
+  `;
+  
+  return await executeQuerySingle<StatsOverview>(query);
+}

app/api/stats/route.ts

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+import { NextResponse } from 'next/server';
+import { getStatsOverview } from './service';
+
+export async function GET() {
+  try {
+    const stats = await getStatsOverview();
+    return NextResponse.json(stats);
+  } catch (error) {
+    console.error('获取统计概览失败:', error);
+    return NextResponse.json(
+      { error: '获取统计概览失败', message: (error as Error).message },
+      { status: 500 }
+    );
+  }
+} 

app/api/stats/service.ts

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+import { StatsOverview } from '../types';
+import { findStatsOverview } from './repository';
+
+/**
+ * Get link statistics overview
+ */
+export async function getStatsOverview(): Promise<StatsOverview> {
+  const stats = await findStatsOverview();
+  
+  // Return default values if no data
+  if (!stats) {
+    return {
+      totalLinks: 0,
+      activeLinks: 0,
+      totalVisits: 0,
+      conversionRate: 0
+    };
+  }
+  
+  return stats;
+}