Another possible scenario for IntegrityError unique-etag-size

[yarikoptic]

SEntry logged

Exception

AssetBlob.DoesNotExist: AssetBlob matching query does not exist.
  File "dandiapi/api/views/upload.py", line 264, in upload_validate_view
    asset_blob = AssetBlob.objects.select_for_update(no_key=True).get(

UniqueViolation: duplicate key value violates unique constraint "unique-etag-size"
DETAIL:  Key (etag, size)=(67d654429806997d34a161c72a5ebd72-1, 2171136) already exists.

  File "django/db/backends/utils.py", line 89, in _execute
    return self.cursor.execute(sql, params)

IntegrityError: duplicate key value violates unique constraint "unique-etag-size"
DETAIL:  Key (etag, size)=(67d654429806997d34a161c72a5ebd72-1, 2171136) already exists.

(18 additional frame(s) were not displayed)
...
  File "dandiapi/api/views/upload.py", line 279, in upload_validate_view
    asset_blob.save()

and quick search lead to prior instances of such violation:

• Fix race condition when uploading the same asset twice #441

which was thought to be addressed by

• Fix race condition on upload validation endpoint #952

but presence of a new violation attests that there is still some ways to trigger it ?