Implement historical tracking using django-pghistory; add middleware for context capture and update model architecture

memory-bank/workflows/model-migrations.md

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+## Model Migration Protocol for History Tracking
+
+### Implementation Steps
+1. **Base Model Setup**  
+   ```python
+   # core/models.py
+   import pghistory
+   
+   class HistoricalModel(models.Model):
+       class Meta:
+           abstract = True
+       
+       @pghistory.track(pghistory.Snapshot())
+       def save(self, *args, **kwargs):
+           return super().save(*args, **kwargs)
+   ```
+
+2. **Concrete Model Implementation**  
+   ```python
+   # parks/models.py
+   class Park(HistoricalModel):
+       @pghistory.track(
+           pghistory.Snapshot('park.create'),
+           pghistory.AfterUpdate('park.update'),
+           pghistory.BeforeDelete('park.delete')
+       )
+       class Meta:
+           # Existing model fields and configuration
+   ```
+
+3. **Migration Generation**  
+   ```bash
+   ./manage.py makemigrations --name add_pghistory_tracking
+   ```
+
+### Quality Assurance
+1. Verify historical events table creation
+2. Test event triggering for CRUD operations
+3. Validate context metadata capture

memory-bank/workflows/moderation.md

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+## Updated Moderation Workflow with django-pghistory
+
+### Submission Lifecycle
+1. **Change Proposal**  
+   - Creates `pending` pghistory event with metadata:  
+     ```python
+     pghistory.track(
+         pghistory.Snapshot('submission.pending'),
+         status='pending'
+     )
+     ```
+2. **Approval Process**  
+   - Merges event into main history:  
+     ```python
+     event.pgh_label = 'approved_change'
+     event.pgh_context['approver'] = request.user
+     ```
+3. **Rejection Handling**  
+   - Preserves event with rejection context:  
+     ```python
+     event.pgh_label = 'rejected_change'
+     event.pgh_context['reason'] = rejection_reason
+     ```
+
+### Moderation Admin Integration
+```python
+# moderation/admin.py
+@admin.register(pghistory.models.Event)
+class HistoryAdmin(admin.ModelAdmin):
+    list_display = ('pgh_label', 'pgh_created_at', 'content_object')
+    readonly_fields = ('pgh_data', 'pgh_context')