This is a new feature in v1.0 of TubeSync and later. It allows you to reset all scheduled tasks from the command line as well as the "reset tasks" button in the "tasks" tab of the dashboard.
This is useful for TubeSync installations where you may have a lot of media and sources added and the "reset tasks" button may take too long to the extent where the page times out (with a 502 error or similar issue).
You have added some sources and media
Execute the following Django command:
./manage.py reset-tasks
When deploying TubeSync inside a container, you can execute this with:
docker exec -ti tubesync python3 /app/manage.py reset-tasks
This command will log what its doing to the terminal when you run it.
When this is run, new tasks will be immediately created so all your sources will be indexed again straight away, any missing information such as thumbnails will be redownloaded, etc.