Updated SQL File to remove dummy data.

get_data.php

@@ -0,0 +1,19 @@
+<?php
+require 'db.php';
+
+$projects = $pdo->query("SELECT * FROM projects ORDER BY sort_order ASC")->fetchAll();
+
+foreach ($projects as &$project) {
+    $stmt = $pdo->prepare("SELECT * FROM tasks WHERE project_id = ? ORDER BY created_at");
+    $stmt->execute([$project['id']]);
+    $project['tasks'] = $stmt->fetchAll();
+
+    foreach ($project['tasks'] as &$task) {
+        $stmt = $pdo->prepare("SELECT * FROM subtasks WHERE task_id = ? ORDER BY created_at");
+        $stmt->execute([$task['id']]);
+        $task['subtasks'] = $stmt->fetchAll();
+    }
+}
+
+echo json_encode($projects);
+?>