Use a signal to prevent a user that the note balance is negative

apps/note/apps.py

@@ -3,7 +3,7 @@
 
 from django.apps import AppConfig
 from django.conf import settings
-from django.db.models.signals import post_save, pre_delete
+from django.db.models.signals import pre_delete, pre_save, post_save
 from django.utils.translation import gettext_lazy as _
 
 from . import signals
@@ -17,6 +17,15 @@ class NoteConfig(AppConfig):
         """
         Define app internal signals to interact with other apps
         """
+        pre_save.connect(
+            signals.pre_save_note,
+            sender="note.noteuser",
+        )
+        pre_save.connect(
+            signals.pre_save_note,
+            sender="note.noteclub",
+        )
+
         post_save.connect(
             signals.save_user_note,
             sender=settings.AUTH_USER_MODEL,