first commit

backend/serviceapp/check_db.php

@@ -0,0 +1,10 @@
+<?php
+require_once __DIR__ . '/../connect.php';
+try {
+    $stmt = $con->prepare("DESCRIBE users");
+    $stmt->execute();
+    $columns = $stmt->fetchAll(PDO::FETCH_ASSOC);
+    echo json_encode($columns);
+} catch (Exception $e) {
+    echo json_encode(['error' => $e->getMessage()]);
+}