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.
Could this be a property rather than a function? If yes, then this could be simplified to be an attribute:
```py
columns = [
    ...
]
```