.. Patchwork - automated patch tracking system
.. Copyright (C) The Patchwork Contributors (see CONTRIBUTORS)
..
.. SPDX-License-Identifier: GPL-2.0-or-later

4.0.0
=====

Patchwork 4.0 is a complete rewrite of the application in Go. The Django/Python
codebase has been replaced by a single statically compiled binary that serves
the web interface, REST API, and SMTP ingress daemon.

Highlights:

- Single binary deployment: no Python, no virtualenvs, no WSGI servers.
- Built-in SMTP/LMTP daemon for receiving emails from Postfix via transport
  maps.
- Webhook support for event-driven integrations.
- Auto-generated OpenAPI documentation served at ``/api/docs``.
- XML-RPC API removed in favor of the REST API.
- Database migration tooling for existing Django installations.
- Compatible with existing user credentials (PBKDF2-SHA256 passwords).

For migration instructions from Django-based Patchwork, see
:doc:`/deployment/migration`.

.. release-notes::