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TIL about the bulk import functionality in django-import-export library.

https://django-import-export.readthedocs.io/en/latest/bulk_import.html

Some caveats:
- set `batch_size` for better performance
- doesn't work with many-to-many relationships
- no `pre_save` and `post_save` signals sent (it' doesn't call `model.save()`)