As of this moment, all 14 remaining stretch questions refer to debian-stretch.status-completed
I recommend tag-mergingAll stretch questions have been retagged -> either to debian-stretch, (which will bulk-retag and apply a synonym), then removing the resultant synonym.
Doing it this way we avoid 14 manual edits, and we aren't left with a generic tag synonymisedor to a specific one, which has caused us problems in the pastother tags as required.