diff --git a/core/models.py b/core/models.py
index e7911eb..fc6e19a 100644
--- a/core/models.py
+++ b/core/models.py
@@ -1,7 +1,5 @@
 import uuid
-from datetime import timedelta
 
-from django.conf import settings
 from django.contrib.auth.models import AbstractUser
 from django.db import models
 
@@ -10,6 +8,8 @@ from core.util import logs
 
 log = logs.get_logger(__name__)
 
+SERVICE_CHOICES = (("nordigen", "Nordigen"),)
+
 
 class User(AbstractUser):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
@@ -22,9 +22,16 @@ class User(AbstractUser):
 
 
 class NotificationSettings(models.Model):
-    user = models.OneToOneField(User, on_delete=models.CASCADE)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
     ntfy_topic = models.CharField(max_length=255, null=True, blank=True)
     ntfy_url = models.CharField(max_length=255, null=True, blank=True)
 
     def __str__(self):
         return f"Notification settings for {self.user}"
+
+
+class Aggregator(models.Model):
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
+    name = models.CharField(max_length=255)
+    service = models.CharField(max_length=255, choices=SERVICE_CHOICES)