Phlogiston uses special cases (including hard-coded Phab task IDs) to generate reporting data about "new" versus "maintenance" tasks. This particular identification technique depends on special tagging of all tasks by a working team. Since the experiment has ended and teams have not been using these tags since 2016, and since any new way of performing these reports should be implemented without these special cases, the relevant code should be removed.
This includes the data:
- `maintenance_week``` table
- `maintenance_delta``` table
- `task_on_date.maint_type``` field
And the code to populate and report on this data, in `make_charts.R``, `make_report_csvs.sql`, `phlogiston.py``, and possibly other places.