2021 major version release

[dwreeves]

Added Major Features

• Celery now handles updating the database asynchronously (still WIP for source downloads, but we're getting close). This means that:
  • Manually triggered updates are less likely to trigger timeouts.
  • Manually triggered updates don't the site to briefly stop working.
• Alembic added to help make operating the database smoother, including migrating some existing data to a new schema.
• Added a way to send an email with all the data. (TODO: add the override revision history as well.)
• Added an about me section at the very bottom of the about 😉
• Added some Docker stuff. I'm going to lean into this a bit more heavily over time, but for now it's not the main focus of how to deploy the app. Deployment to Heroku via the container registry is still not supported.
• Flake8 is now part of the continuous integration.

Refactors

• Almost too many to count.
• /admin gets its own folder.
• Using the generic /app instead of /flagging_site.
• Way cleaner interface with the db.Models using Werkzeug LocalProxys to facilitate writing code that is way more intuitive (e.g. using a List[Boathouse] object rather than some loose dict representation of it).

[dwreeves]

The code is technically safe to merge in its current form (the migration has been tested on a Postgres db backup of the production database). But I have until March 2021 before I need to have this in, so I'm going to chill and roll in a few more features, most notably:

• Celery-powered downloads for the "source" tables.
• Add override history to the email.
• Maybe a couple other things on the todo list.