I had to do some poking around in the finder to find the actual directory. I think this command should consistently find it:
```bash
datasette $(find ~/Library/Containers/*/Data/Documents/watermelon.db) --cors --setting max_returned_rows 20000
```
Thanks and yes on the second point: I eventually realized that it only polls single values on the number display and doesn't store them in the database unfortunately.
Also, if you leave open the chart, it goes stale after a few hours and becomes blank. I'm thinking about making an App Store review on the iPad app requesting the chart can be left open and poll for more data once a half hour or hour.