Add require() postgres test and update Vercel config

pages/api/test-postgres-require.js

@@ -0,0 +1,38 @@
+export default async function handler(req, res) {
+  // Set CORS headers
+  res.setHeader('Access-Control-Allow-Origin', '*');
+  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
+  res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization');
+
+  // Handle preflight requests
+  if (req.method === 'OPTIONS') {
+    res.status(200).end();
+    return;
+  }
+
+  if (req.method !== 'GET') {
+    return res.status(405).json({ error: 'Method not allowed' });
+  }
+
+  try {
+    // Use require instead of import
+    const { sql } = require('@vercel/postgres');
+    
+    // Test database connection
+    const result = await sql`SELECT NOW() as current_time, version() as postgres_version`;
+    
+    return res.status(200).json({
+      success: true,
+      message: 'PostgreSQL connection successful!',
+      data: result.rows[0],
+      timestamp: new Date().toISOString()
+    });
+  } catch (error) {
+    console.error('❌ PostgreSQL connection error:', error);
+    return res.status(500).json({
+      error: 'PostgreSQL connection failed',
+      details: error.message,
+      stack: error.stack
+    });
+  }
+} 

vercel.json

@@ -2,6 +2,7 @@
   "framework": "nextjs",
   "buildCommand": "npm run build",
   "outputDirectory": ".next",
+  "installCommand": "npm install",
   "headers": [
     {
       "source": "/static/(.*)",