Please change it to:
```
UsageType.objects.get_or_create(
    symbol=usage_symbol,
    defaults=dict(
        name=usage_symbol,
    ),
)
```

Using this convention, symbol will be constant but name could be changed (ex. in admin panel) in the future (usage type will be 'recognized' only by symbol, not by pair symbol-name and when there is no such a usage type with specified symbol, it'll be created with `defaults` arguments (name in this case)).