diff --git a/app/database/models.py b/app/database/models.py
index fed3233a..70c9874a 100644
--- a/app/database/models.py
+++ b/app/database/models.py
@@ -560,12 +560,15 @@ class SentNotification(Base):
     __tablename__ = "sent_notifications"
 
     id = Column(Integer, primary_key=True, index=True)
-    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
-    subscription_id = Column(Integer, ForeignKey("subscriptions.id"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    subscription_id = Column(Integer, ForeignKey("subscriptions.id", ondelete="CASCADE"), nullable=False)
     notification_type = Column(String(50), nullable=False)
     days_before = Column(Integer, nullable=True)
     created_at = Column(DateTime, default=func.now())
 
+    user = relationship("User", backref="sent_notifications")
+    subscription = relationship("Subscription", backref="sent_notifications")
+
 class BroadcastHistory(Base):
     __tablename__ = "broadcast_history"
     
diff --git a/migrations/alembic/versions/cbd1be472f3d_add_cascade_to_sent_notifications.py b/migrations/alembic/versions/cbd1be472f3d_add_cascade_to_sent_notifications.py
new file mode 100644
index 00000000..08ae5543
--- /dev/null
+++ b/migrations/alembic/versions/cbd1be472f3d_add_cascade_to_sent_notifications.py
@@ -0,0 +1,24 @@
+"""add cascade delete to sent notifications"""
+
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = 'cbd1be472f3d'
+down_revision: Union[str, None] = '8fd1e338eb45'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.drop_constraint('sent_notifications_user_id_fkey', 'sent_notifications', type_='foreignkey')
+    op.drop_constraint('sent_notifications_subscription_id_fkey', 'sent_notifications', type_='foreignkey')
+    op.create_foreign_key('fk_sent_notifications_user_id_users', 'sent_notifications', 'users', ['user_id'], ['id'], ondelete='CASCADE')
+    op.create_foreign_key('fk_sent_notifications_subscription_id_subscriptions', 'sent_notifications', 'subscriptions', ['subscription_id'], ['id'], ondelete='CASCADE')
+
+
+def downgrade() -> None:
+    op.drop_constraint('fk_sent_notifications_user_id_users', 'sent_notifications', type_='foreignkey')
+    op.drop_constraint('fk_sent_notifications_subscription_id_subscriptions', 'sent_notifications', type_='foreignkey')
+    op.create_foreign_key('sent_notifications_user_id_fkey', 'sent_notifications', 'users', ['user_id'], ['id'])
+    op.create_foreign_key('sent_notifications_subscription_id_fkey', 'sent_notifications', 'subscriptions', ['subscription_id'], ['id'])