Actually there is no Script for Updating the Database. Therefore you have to update ProjectPeriod manually.

First you have to backup your bata by making a dump:

./manage.py dumdata > data.json

Please backup your installation with the data.json file. Now you can install the new version like a new installation and use your old configuration parameters from your backup.

While using the install script you should not create an admin account.

The next step is to import your old data with this command:

./manage.py loaddata data.json

If you get any error messages you will have to change the data in the json file to make it valid for the new database shema.