Add history tracking functionality using django-pghistory; implement views, templates, and middleware for event serialization and context management

history/views.py

@@ -0,0 +1,41 @@
+from django.views import View
+from django.shortcuts import render
+from django.http import JsonResponse
+from django.contrib.contenttypes.models import ContentType
+import pghistory
+
+def serialize_event(event):
+    """Serialize a history event for JSON response"""
+    return {
+        'label': event.pgh_label,
+        'created_at': event.pgh_created_at.isoformat(),
+        'context': event.pgh_context,
+        'data': event.pgh_data,
+    }
+
+class HistoryTimelineView(View):
+    """View for displaying object history timeline"""
+    
+    def get(self, request, content_type_id, object_id):
+        # Get content type and object
+        content_type = ContentType.objects.get_for_id(content_type_id)
+        obj = content_type.get_object_for_this_type(id=object_id)
+
+        # Get history events
+        events = pghistory.models.Event.objects.filter(
+            pgh_obj_model=content_type.model_class(),
+            pgh_obj_id=object_id
+        ).order_by('-pgh_created_at')[:25]
+
+        context = {
+            'events': events,
+            'content_type': content_type,
+            'object': obj,
+        }
+
+        if request.htmx:
+            return render(request, "history/partials/history_timeline.html", context)
+            
+        return JsonResponse({
+            'history': [serialize_event(e) for e in events]
+        })