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inventory-server/src/utils/db.js

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+const mysql = require('mysql2/promise');
+
+let pool;
+
+function initPool(config) {
+  pool = mysql.createPool(config);
+  return pool;
+}
+
+async function getConnection() {
+  if (!pool) {
+    throw new Error('Database pool not initialized');
+  }
+  return pool.getConnection();
+}
+
+module.exports = {
+  initPool,
+  getConnection,
+  getPool: () => pool
+};