User configurable reports

the plan is to pilot/QA on this on prod so I'm putting it out for code review now. I'm guessing it's easiest to review as a whole, though the commits should represent ~atomic actions.

I think it's good to merge whenever code review passes.
`DAYS_IN_A_WEEK =  7 ` seems a bit silly. let me know if you disagree (will put a comment)