v4.7 (#12478)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: peaklabs-dev <122374094+peaklabs-dev@users.noreply.github.com>
Co-authored-by: Aditya Tripathi <aditya@climactic.co>

app/Exceptions/UpgradeAlreadyRunningException.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Exceptions;
+
+use App\Services\CoolifyUpgradeStatus;
+use Exception;
+
+/**
+ * An upgrade was not started because another upgrade script is still running.
+ * This is not a failure of the running upgrade.
+ */
+class UpgradeAlreadyRunningException extends Exception
+{
+    public function __construct()
+    {
+        parent::__construct(
+            'Another Coolify upgrade is already running. Wait for it to finish. '.
+            'If it has stopped, you can upgrade again '.CoolifyUpgradeStatus::RUNNING_LOCK_EXPIRES_AFTER_MINUTES.' minutes after its last status update.'
+        );
+    }
+}