fix commas

history_tracking/apps.py

@@ -0,0 +1,20 @@
+# history_tracking/apps.py
+from django.apps import AppConfig
+
+
+class HistoryTrackingConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "history_tracking"
+
+    def ready(self):
+        from .mixins import HistoricalChangeMixin
+        from .models import Park
+
+        models_with_history = [Park]
+
+        for model in models_with_history:
+            # Check if mixin is already applied
+            if HistoricalChangeMixin not in model.history.model.__bases__:
+                model.history.model.__bases__ = (
+                    HistoricalChangeMixin,
+                ) + model.history.model.__bases__