for celery, run this:

celery -A celery_worker.celery worker --loglevel=INFO


on prod web server, celery is managed by systemd: /etc/default/celeryd and /etc/systemd/system/celeryd.service

sudo systemctl stop celeryd
sudo systemctl restart celeryd or sudo service celeryd restart

*** check for celery-related problems by looking in /var/log/celery ***

for profiling:
use
python profile_app.py
instead of
flask run



translations:

See https://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xiii-i18n-and-l10n-2018

to add a new language which can be worked on:

pybabel init -i messages.pot -d app/translations -l <language code>

after changes to the files in app/translations/* are mode, they need to be compiled
pybabel compile -d app/translations


sass is used to compile .scss files into .css files. https://sass-lang.com/dart-sass/. Get the latest version of the
command line app from https://github.com/sass/dart-sass/releases/ as old versions produce slightly different output.