The first version of my LinkedIn company-jobs Actor looked like it worked. Point it at a company, get back every open role. The dataset had hundreds of rows, the fields were populated, the run finished green. It was returning about three quarters of the jobs, and a different three quarters each time. Worse, I had built change tracking on top of it — "these 12 roles opened since your last run, these 5 closed" — and that feature was manufacturing closures out of nothing. One test run reporte...