Does this mean that the report emailer will stop working after 20 months?

What do you think of naming the file with the date and letting this process overwrite it (i.e. making the file generation idempotent)?

If we were worried about consuming the disk with 1,000s of months of these files, we could keep the last 20 with something like

```bash
ls -1dt * | tail -n +20 |  xargs rm
```