IT jobs failing under Windows due to bad cleanup of Drive database

> lessmsi\lessmsi /x dist\nuxeo-drive-1.2013.0926-win32.msi nxdrive_msi
19:45:00 Extracting 'C:\Jenkins\workspace\IT-nuxeo-drive-5.6.0-windows\dist\nuxeo-drive-1.2013.0926-win32.msi' to 'C:\Jenkins\workspace\IT-nuxeo-drive-5.6.0-windows\nxdrive_msi'.
19:45:00 > nxdrive_msi\SourceDir\ndrive.exe test
19:45:00 Traceback (most recent call last):
19:45:00   File "C:\Python27\lib\site-packages\cx_Freeze\initscripts\Console.py", line 27, in <module>
19:45:00     exec code in m.__dict__
19:45:00   File "nuxeo-drive-client/scripts/ndrive", line 6, in <module>
19:45:00     sys.exit(main())
19:45:00   File "nuxeo-drive-client\nxdrive\commandline.py", line 489, in main
19:45:00     return CliHandler().handle(argv)
19:45:00   File "nuxeo-drive-client\nxdrive\commandline.py", line 309, in handle
19:45:00     timeout=options.timeout)
19:45:00   File "nuxeo-drive-client\nxdrive\controller.py", line 103, in __init__
19:45:00     device_config = self.get_device_config()
19:45:00   File "nuxeo-drive-client\nxdrive\controller.py", line 129, in get_device_config
19:45:00     return session.query(DeviceConfig).one()
19:45:00   File "C:\Users\nuxeo\AppData\Roaming\Python\Python27\site-packages\sqlalchemy\orm\query.py", line 2184, in one
19:45:00     ret = list(self)
19:45:00   File "C:\Users\nuxeo\AppData\Roaming\Python\Python27\site-packages\sqlalchemy\orm\query.py", line 2227, in __iter__
19:45:00     return self._execute_and_instances(context)
19:45:00   File "C:\Users\nuxeo\AppData\Roaming\Python\Python27\site-packages\sqlalchemy\orm\query.py", line 2242, in _execute_and_instances
19:45:00     result = conn.execute(querycontext.statement, self._params)
19:45:00   File "C:\Users\nuxeo\AppData\Roaming\Python\Python27\site-packages\sqlalchemy\engine\base.py", line 1449, in execute
19:45:00     params)
19:45:00   File "C:\Users\nuxeo\AppData\Roaming\Python\Python27\site-packages\sqlalchemy\engine\base.py", line 1584, in _execute_clauseelement
19:45:00     compiled_sql, distilled_params
19:45:00   File "C:\Users\nuxeo\AppData\Roaming\Python\Python27\site-packages\sqlalchemy\engine\base.py", line 1698, in _execute_context
19:45:00     context)
19:45:00   File "C:\Users\nuxeo\AppData\Roaming\Python\Python27\site-packages\sqlalchemy\engine\base.py", line 1691, in _execute_context
19:45:00     context)
19:45:00   File "C:\Users\nuxeo\AppData\Roaming\Python\Python27\site-packages\sqlalchemy\engine\default.py", line 331, in do_execute
19:45:00     cursor.execute(statement, parameters)
19:45:00 sqlalchemy.exc.OperationalError: (OperationalError) no such column: device_config.proxy_config u'SELECT device_config.device_id AS device_config_device_id, device_config.proxy_config AS device_config_proxy_config, device_config.proxy_type AS device_config_proxy_type, device_config.proxy_server AS device_config_proxy_server, device_config.proxy_port AS device_config_proxy_port, device_config.proxy_authenticated AS device_config_proxy_authenticated, device_config.proxy_username AS device_config_proxy_username, device_config.proxy_password AS device_config_proxy_password, device_config.proxy_exceptions AS device_config_proxy_exceptions \nFROM device_config' ()
19:45:00 Command nxdrive_msi\SourceDir\ndrive.exe test returned with code 1