Refactor comments app to use mixins for comment functionality; update admin interfaces and add historical model fixes

memory-bank/evaluations/historical_model_comment_fixes.md

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+# Historical Model Comment Fixes
+
+## Problem
+System check errors occurred because historical models referenced CommentThread in their own app context (e.g. `companies.commentthread`) instead of the actual `comments.CommentThread` model.
+
+## Solution
+Added `excluded_fields = ['comments']` to Meta classes of all affected models to exclude comment relationships from historical tracking. Note: Initially tried `history_exclude` but this was incorrect - django-simple-history uses `excluded_fields`.
+
+## Affected Models (Fixed)
+- Company (companies/models.py)
+- Manufacturer (companies/models.py)
+- Designer (companies/models.py)
+- Park (parks/models.py)
+- ParkArea (parks/models.py)
+- Ride (rides/models.py)
+- RideModel (rides/models.py)
+- Review (reviews/models.py)
+
+## Implementation Details
+Each model's Meta class was updated to exclude the comments field from historical tracking:
+
+```python
+class Meta:
+    # ... other Meta options ...
+    excluded_fields = ['comments']  # Exclude from historical tracking
+```
+
+This prevents django-simple-history from attempting to track the GenericRelation field in historical models, which was causing the system check errors.
+
+## Verification
+Run system checks to verify fix:
+```bash
+python manage.py check