Post weekly summary to Slack

[TimJentzsch]

We could have a background task that posts a summary message to the Slack once a week.

The message could include the following:

• General stats:
  • Number of total volunteers
  • Number of new volunteers
  • Number of active volunteers (i.e. old and new volunteers transcribing in this week)
  • Number of total transcriptions
  • Number of new transcriptions
• Transcription checks:
  • Number of checks
  • Percentage of comments
  • Percentage of warnings

This could give us a better understanding how we are growing and how healthy our ecosystem is.

The main challenge here will be to figure out the best way to do background tasks in Django.

[TimJentzsch]

This might be an option for us: https://django-background-tasks.readthedocs.io/en/latest/
However, we'll need to figure out how to start the task consistently at a specific time of the week, even if the bot is restarted in-between.