diff --git a/backend/account/migrations/0014_alter_pushsubscription_created_at_and_more.py b/backend/account/migrations/0014_alter_pushsubscription_created_at_and_more.py
new file mode 100644
index 0000000..118d513
--- /dev/null
+++ b/backend/account/migrations/0014_alter_pushsubscription_created_at_and_more.py
@@ -0,0 +1,23 @@
+# Generated by Django 5.1.2 on 2025-02-16 20:48
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('account', '0013_pushsubscription'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='pushsubscription',
+            name='created_at',
+            field=models.DateTimeField(auto_now_add=True),
+        ),
+        migrations.AlterField(
+            model_name='pushsubscription',
+            name='endpoint',
+            field=models.TextField(unique=True),
+        ),
+    ]
diff --git a/backend/account/models.py b/backend/account/models.py
index 910673a..c1b59b5 100644
--- a/backend/account/models.py
+++ b/backend/account/models.py
@@ -144,9 +144,9 @@ from pywebpush import webpush, WebPushException
 
 class PushSubscription(models.Model):
     user = models.ForeignKey(User, on_delete=models.CASCADE)
-    endpoint = models.TextField()
+    endpoint = models.TextField(unique=True)
     keys = models.JSONField()
-    created_at = models.DateField(auto_now_add=True)
+    created_at = models.DateTimeField(auto_now_add=True)
 
     def __str__(self):
         return f'{self.user} push'
@@ -192,7 +192,8 @@ class PushSubscription(models.Model):
                     data=json.dumps(payload),
                     vapid_private_key=settings.VAPID_PRIVATE_KEY,
                     vapid_claims={
-                        "sub": "mailto:admin@example.com"
+                        "sub": "mailto:admin@example.com",
+                        'aud': 'https://mamalizz-cooked.vercel.app'
                     }
                 )
             except WebPushException as ex: