Refactor code structure and remove redundant changes

django-backend/apps/entities/apps.py

@@ -0,0 +1,15 @@
+"""
+Entities app configuration.
+"""
+
+from django.apps import AppConfig
+
+
+class EntitiesConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'apps.entities'
+    verbose_name = 'Entities'
+    
+    def ready(self):
+        """Import signal handlers when app is ready."""
+        import apps.entities.signals  # noqa