Refactor: Fully migrated to direct PostgreSQL, implemented Public API v1, fixed Vercel deployment conflicts, and updated documentation

app/admin/customers/page.tsx

@@ -8,17 +8,15 @@ import {
     MoreHorizontal,
     ArrowUpRight
 } from 'lucide-react';
-import { supabaseAdmin } from '@/lib/supabase-admin';
+import { db } from '@/lib/db';
 
 import CustomerSearch from '@/components/admin/CustomerSearch';
 
 async function getFilteredCustomers(queryText?: string) {
-    const { data: transactions, error } = await supabaseAdmin
-        .from('transactions')
-        .select('*')
-        .order('created_at', { ascending: false });
+    const result = await db.query('SELECT * FROM transactions ORDER BY created_at DESC');
+    const transactions = result.rows;
 
-    if (error || !transactions) return null;
+    if (!transactions) return null;
 
     // Group transactions by name or phone
     const customerMap = new Map();