I'd also add: Be wary of context dependent actions (e.g. render_template, user.set_password, sign_url, base_url) as you aren't in the application/request contex

I'd also add: Be wary of context dependent actions (e.g. render_template, user.set_password, sign_url, base_url) as you aren't in the application/request context inside of a celery task.