diff --git a/modules/notifications/lib/Module/Notifications/Service/NotificationService.php b/modules/notifications/lib/Module/Notifications/Service/NotificationService.php
index be8abc2..216107f 100644
--- a/modules/notifications/lib/Module/Notifications/Service/NotificationService.php
+++ b/modules/notifications/lib/Module/Notifications/Service/NotificationService.php
@@ -9,13 +9,15 @@ class NotificationService
 {
     private const MESSAGE_META_KEY = '__message';
     private const DEDUPE_WINDOW_MINUTES = 30;
+
+    /** @var array<string, int|true> Type → dedup window in minutes (true = default window). */
     private const DEDUPE_TYPES = [
         'user.created' => true,
         'user.deleted' => true,
         'user.activated' => true,
         'user.deactivated' => true,
         'user.assignment_changed' => true,
-        'scheduler.job_failed' => true,
+        'scheduler.job_failed' => 1440,
     ];
 
     public function __construct(
@@ -233,6 +235,9 @@ class NotificationService
             return [];
         }
 
+        $windowMinutes = self::DEDUPE_TYPES[$type];
+        $windowMinutes = is_int($windowMinutes) && $windowMinutes > 0 ? $windowMinutes : self::DEDUPE_WINDOW_MINUTES;
+
         $tenantScope = $tenantId !== null && $tenantId > 0 ? $tenantId : 0;
         $raw = implode('|', [
             'recipient:' . $recipientUserId,
@@ -243,7 +248,7 @@ class NotificationService
 
         return [
             'fingerprint' => hash('sha256', $raw),
-            'bucket' => intdiv(time(), self::DEDUPE_WINDOW_MINUTES * 60),
+            'bucket' => intdiv(time(), $windowMinutes * 60),
         ];
     }