diff --git a/backend/config/database.php b/backend/config/database.php
index 07edb7a..1343d8f 100644
--- a/backend/config/database.php
+++ b/backend/config/database.php
@@ -38,5 +38,5 @@ function migrate($db) {
         role ENUM('admin','user') DEFAULT 'user',
         created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
     )");
-    $db->exec("CREATE TABLE IF NOT EXISTS node_notes (node_id INT PRIMARY KEY, notes TEXT DEFAULT '')");
+    $db->exec("CREATE TABLE IF NOT EXISTS node_notes (id INT AUTO_INCREMENT PRIMARY KEY, node_id INT NOT NULL UNIQUE, notes TEXT DEFAULT '')");
 }
\ No newline at end of file