> For the complete documentation index, see [llms.txt](https://docs.radicalframework.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.radicalframework.com/memento.md).

# Memento

- [Change Tracking Service](https://docs.radicalframework.com/memento/change-tracking-service.md)
- [MementoEntity and MementoEntityCollection](https://docs.radicalframework.com/memento/change-tracking-service/memento-entities.md)
- [Handling change tracking:](https://docs.radicalframework.com/memento/change-tracking-service/handling-change-tracking.md)
- [Simple model](https://docs.radicalframework.com/memento/change-tracking-service/handling-change-tracking/simple-model.md)
- [Collections](https://docs.radicalframework.com/memento/change-tracking-service/handling-change-tracking/collections.md)
- [Complex objects graph](https://docs.radicalframework.com/memento/change-tracking-service/handling-change-tracking/complex-graph.md)
- [Atomic operations](https://docs.radicalframework.com/memento/change-tracking-service/atomic-operations.md)
- [Change Tracking Service API](https://docs.radicalframework.com/memento/change-tracking-service/change-tracking-service-api.md)
- [Property Metadata for the ChangeTrackingService](https://docs.radicalframework.com/memento/change-tracking-service/memento-metadata.md)
- [Handling collection sync](https://docs.radicalframework.com/memento/change-tracking-service/handling-collection-sync.md)
- [Property State](https://docs.radicalframework.com/memento/change-tracking-service/property-state.md)