Refactor model imports and update admin classes to use pghistory for historical tracking; replace HistoricalModel with TrackedModel in relevant models

memory-bank/decisions/migration-progress.md

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+# PGHistory Migration Progress
+
+## All Migrations Complete! 🎉
+
+### Latest Migration
+- `location/migrations/0002_locationevent_remove_historicallocation_content_type_and_more.py`
+  - Created LocationEvent model
+  - Removed simple-history fields
+  - Set up pghistory triggers
+  - Cleaned up historical models
+
+### Previously Completed Migrations
+
+1. Companies App
+   - Created CompanyEvent and ManufacturerEvent
+   - Removed Designer model
+   - Set up pghistory triggers
+
+2. Rides App
+   - Created RideEvent and RideModelEvent
+   - Removed simple-history fields
+   - Updated Designer foreign key
+   - Set up pghistory triggers
+
+3. Parks App
+   - Created ParkEvent and ParkAreaEvent models
+   - Set up pghistory tracking triggers
+   - Removed simple-history fields and models
+
+4. Designers App
+   - Created DesignerEvent model
+   - Set up insert/update triggers
+   - Full pghistory implementation
+
+5. Moderation Models
+   - Created EditSubmissionEvent model
+   - Created PhotoSubmissionEvent model
+   - Set up triggers for both models
+
+## Infrastructure Updates
+1. History Tracking App
+   - Removed simple-history initialization from apps.py
+   - Updated base models to use pghistory
+   - Added DiffMixin for tracking changes
+
+## Final Steps
+
+### 1. Remove django-simple-history
+```bash
+# Update requirements.txt
+- Remove django-simple-history==3.8.0
+```
+
+### 2. Clean Up Configuration
+- Remove any remaining simple-history settings
+- Update documentation for new history tracking
+- Add migration guide for future models
+
+### 3. Testing
+1. Test all models:
+   - Create/Update/Delete operations
+   - Historical queries
+   - Change tracking
+   - Event context
+
+2. Verify functionality:
+   - Slug history lookups
+   - Model relationships
+   - Admin interfaces
+
+### 4. Documentation Updates
+1. Update model documentation
+2. Add pghistory usage examples
+3. Document migration patterns
+4. Update contributor guide
+
+## Technical Notes
+- PGHistory tracking implemented via triggers
+- Event models store complete history
+- Foreign key relationships preserved
+- Context tracking available
+- GeoDjango fields supported
+- Improved query performance expected
+
+## Migration Statistics
+✅ Designer Model
+✅ Moderation Models
+✅ Companies Models
+✅ Rides Models
+✅ Parks Models
+✅ Location Models
+
+## Lessons Learned
+1. Keep backward compatibility during transition
+2. Migrate models in dependency order
+3. Test thoroughly after each migration
+4. Update related code incrementally
+5. Maintain documentation throughout