Add debug log and default host for PostgreSQL client

Added debug log for PostgreSQL connection and default host.

Author: rabianadeem-121

index.js

@@ -1,16 +1,18 @@
 const { Client } = require('pg');
 
 exports.handler = async (event) => {
-    // Create a NEW client inside handler
+    // Force IPv4 for SSH tunnel
     const client = new Client({
-        host: process.env.DB_HOST,
+        host: process.env.DB_HOST || '127.0.0.1', // default to 127.0.0.1
         user: process.env.DB_USER,
         password: process.env.DB_PASSWORD,
         database: process.env.DB_NAME,
         port: 5432,
         ssl: { rejectUnauthorized: false } // IMPORTANT for RDS
     });
 
+    console.log('Connecting to PostgreSQL on host:', client.host); // debug log
+
     await client.connect();
 
     const method = event.httpMethod;