# ReplayEngine Architecture
> **⚠️ DEPRECATED**: This document has been merged into [Durable Futures Internals](durable-futures-internals.md).
>
> - For concepts and how replay works, see the main sections
> - For implementation details, see [Implementation Details (For Maintainers)](durable-futures-internals.md#implementation-details-for-maintainers)
This file is kept for backward compatibility with existing links. It will be removed in a future release.