GREG-21: Various model updates

The commits in this merge request contain changes done to be able to import the test data. It is basically opening up for more fields to be able to be null.

Maybe @jbr also wants to take a quick look to see if he agrees with the fields that now can be null.

requested review from @andretol

changed the description

added 5 commits

• d8d9aba5...e1363c26 - 4 commits from branch master
• a6d5f462 - Merge branch 'master' into GREG-21_test_data_model_updates

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As you said, @jbr may want to look at this. But I’m giving it a thumbs up anyway.

approved this merge request

added 22 commits

• a6d5f462...d9cf3249 - 20 commits from branch master
• 6749484d - Merge branch 'master' into GREG-21_test_data_model_updates
• a263e542 - Recreating initial migration

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merged

mentioned in commit d7a384f8