Update migration files for Django 5.1.4; remove obsolete merge migrations and adjust history tracking context in templates

moderation/mixins.py

@@ -249,10 +249,10 @@ class HistoryMixin:
             obj = self.get_object()  # type: ignore
             
             # Get historical records ordered by date if available
-            history = getattr(obj, 'history', None)
-            if history is not None:
-                context['history'] = history.all().select_related('history_user').order_by('-history_date')
-            else:
+            try:
+                # Use pghistory's get_history method
+                context['history'] = obj.get_history()
+            except (AttributeError, TypeError):
                 context['history'] = []
             
             # Get related edit submissions