## 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