diff --git a/scripts/migrate_add_reminder_fields.php b/scripts/migrate_add_reminder_fields.php
new file mode 100644
index 0000000..0eea06a
--- /dev/null
+++ b/scripts/migrate_add_reminder_fields.php
@@ -0,0 +1,45 @@
+<?php
+// Migration script to add reminder fields to #__sportsmanager_turnier
+// Usage: php scripts/migrate_add_reminder_fields.php
+
+use Joomla\CMS\Factory;
+
+if (!defined('_JEXEC')) {
+    define('_JEXEC', 1);
+    define('JPATH_BASE', dirname(__DIR__, 6));
+    require_once JPATH_BASE . '/includes/defines.php';
+    require_once JPATH_BASE . '/includes/framework.php';
+}
+
+function addReminderFieldsToTurnierTable()
+{
+    $db = Factory::getDbo();
+    $columns = [
+        'reminder_24h_sent',
+        'reminder_3d_sent',
+        'reminder_7d_sent',
+    ];
+    // Check if columns already exist
+    $db->setQuery("SHOW COLUMNS FROM #__sportsmanager_turnier");
+    $existing = array_column($db->loadAssocList(), 'Field');
+    $alter = [];
+    if (!in_array('reminder_24h_sent', $existing)) {
+        $alter[] = 'ADD COLUMN `reminder_24h_sent` DATETIME DEFAULT NULL';
+    }
+    if (!in_array('reminder_3d_sent', $existing)) {
+        $alter[] = 'ADD COLUMN `reminder_3d_sent` DATETIME DEFAULT NULL';
+    }
+    if (!in_array('reminder_7d_sent', $existing)) {
+        $alter[] = 'ADD COLUMN `reminder_7d_sent` DATETIME DEFAULT NULL';
+    }
+    if ($alter) {
+        $query = 'ALTER TABLE #__sportsmanager_turnier ' . implode(', ', $alter);
+        $db->setQuery($query);
+        $db->execute();
+        echo "Migration successful: reminder fields added.\n";
+    } else {
+        echo "Migration skipped: fields already exist.\n";
+    }
+}
+
+addReminderFieldsToTurnierTable();