IntegrityError: new row for relation "contentcuration_contentnode" violates check constraint "contentcuration_con...

Sentry Issue: STUDIO-EBQ

IntegrityError: new row for relation "contentcuration_contentnode" violates check constraint "contentcuration_contentnode_rght_check"
DETAIL:  Failing row contains (5fa258f566774723b861cf53eee1adb5, c51a0f842fed427c95acff9bb4a21e3c, Inclusive Education Resources, , 1, , 2021-05-18 01:03:14.587279+00, 2021-05-18 01:03:14.598927+00, t, 1, -10, 4026353, 0, null, topic, null, null, null, f, c51a0f842fed427c95acff9bb4a21e3c, {}, , null, null, null, null, null, null, null, null, null, f, f, learner, , , null).

  File "django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "django_prometheus/db/common.py", line 68, in execute
    return super(CursorWrapper, self).execute(*args, **kwargs)

IntegrityError: new row for relation "contentcuration_contentnode" violates check constraint "contentcuration_contentnode_rght_check"
DETAIL:  Failing row contains (5fa258f566774723b861cf53eee1adb5, c51a0f842fed427c95acff9bb4a21e3c, Inclusive Education Resources, , 1, , 2021-05-18 01:03:14.587279+00, 2021-05-18 01:03:14.598927+00, t, 1, -10, 4026353, 0, null, topic, null, null, null, f, c51a0f842fed427c95acff9bb4a21e3c, {}, , null, null, null, null, null, null, null, null, null, f, f, learner, , , null).

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  File "django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "django/db/utils.py", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "django/utils/six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "django_prometheus/db/common.py", line 68, in execute
    return super(CursorWrapper, self).execute(*args, **kwargs)

Start with the linked Sentry issue and the failing PostgreSQL constraint on the contentcuration_contentnode relation. Trace the code path that creates the failing ContentNode row and identify why rght is negative; done means the operation no longer violates the constraint and the failure is covered by an appropriate regression check.