API's: employee onboarding, authentication through JWT

Co-authored-by: Copilot <copilot@github.com>

employee_api/db.js

@@ -0,0 +1,24 @@
+const { Pool } = require('pg');
+require('dotenv').config();
+const pool = new Pool({
+    host: process.env.PG_HOST,
+    port: process.env.PG_PORT,
+    user: process.env.PG_USER,
+    password: process.env.PG_PASS,
+    database: process.env.PG_DB,
+    max: 10,
+    idleTimeoutMillis: 30000
+});
+
+pool.query('SELECT 1')
+  .then(() => console.log('PostgreSQL connection OK'))
+  .catch(err => {
+    console.error('PostgreSQL connection FAILED');
+    console.error(err);
+    process.exit(1);
+  });
+
+module.exports = {
+  query: (text, params) => pool.query(text, params),
+  pool
+};