Creating example tables fails

[henhuy]

Description of the issue

Creating example tables fails due to legacy attribute "is_staff" in login_myuser table.
Afterwards creation of wind example table fails as well (even with quick user fix)

Steps to Reproduce

1. Run python manage.py create_example_tables

Ideas of solution

Remove attribute "is_staff" from user generation here:

oeplatform/dataedit/management/commands/create_example_tables.py

Line 84 in 04f9b52

name="test", defaults={"email": "test@mail.com", "is_staff": True}

[henhuy]

Removing "is_staff" will fix creating a user.
But then command fails with following error:

✘ Failed to create data.example_wind_farm_capacity: Could not create table example_wind_farm_capacity
Table 'data.example_wind_farm_capacity' not found in reflected metadata.