Is there not a risk that other `IntegrityErrors` are raised? It just feels too risky. Constraints and constraint indexes are supposed to be used as last resort kinda things. For example, you might be using a database that doesn't support unique composite indexes some day and then shit *can* hit the fan. 

A more controlled approach would be:

```python
file_, created = File.objects.get_or_create(
    file_name=row[0],
    debug=row[2],
    debug_filename=row[1]
)
if created:
    # it did NOT exist before with those specific fields
    file_.created_by = sysuser
    file_.modified_by = sysuser
    file_.version = row[3]
    file_.save()
```

Another benefit is that the code documents the intent and core functionality in plain and simple python.