Since upgrading to app-engine-patch 1.0 you have to run manage.py instead of the dev server. However, I hadn’t bothered to trace down why the
–datastore_path=filename.datastore parameter wasn’t working until today.
For informal parameters, the name and values are not added separately. So you can work around this by dropping the
–history_path. Otherwise the datastore is put in
/tmp on OSX and that gets erased when you reboot.