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> I think technically you can use 403 for your Train backport as there
> was no newer migration ever merged. But I hope others more experience
> with DB migration backporting in Nova can confirm this.

Yes, 403 is a placeholder for backports *from* Ussuri, to
Train. However, I don't think the stated change is a reasonable
candidate for a schema backport. They really should only be used for
critical regressions that can't be fixed any other way. Since the length
of that column hasn't changed lately, I wouldn't call it a regression,
and definitely not critical. Going forward we can expand the size in
master, if need-be, but I would not support backporting that change.

--Dan