Procrastinate

What Procrastinate is

Procrastinate is an open-source distributed task processing library for Python applications that need to send work to background workers. It uses PostgreSQL 13 or later to store job definitions, coordinate locks and dispatch tasks. Jobs can run once in the future, after a delay or periodically. Tasks support retry limits, exception filters and constant, linear or exponential delays. Jobs with a shared lock run one at a time, ordered by priority and then creation time.

The library supports synchronous and asynchronous code, and its documentation recommends asynchronous use when possible. Django integration can use Django database settings, load tasks from apps, and provide models, admin pages and migrations for Procrastinate tables. Command-line tools include health checks and an interactive shell for inspecting and administering jobs, tasks, queues and locks. The shell is experimental, and an administration web portal is not yet available. Procrastinate is free and self-hosted; the quickstart installs it in a Python virtual environment with `pip install procrastinate`. It is known to work on Windows, but the documentation advises Unix-like systems for production because workers may stop abruptly on Windows and automated Windows tests are absent.