Added authentication functionality and simple role based model

delete_subtask.php

@@ -1,6 +1,11 @@
 <?php
 require 'db.php';
+require 'auth.php';
+
+require_login();
+$user_id = current_user_id();
+
 $id = intval($_GET['id'] ?? 0);
 if ($id > 0) {
-	$pdo->prepare("DELETE FROM subtasks WHERE id = ?")->execute([$id]);
+    $pdo->prepare("DELETE FROM subtasks WHERE id = ? AND user_id = ?")->execute([$id, $user_id]);
 }