Only update changed field

wagtail/actions/publish_revision.py

@@ -114,7 +114,7 @@ class PublishRevisionAction:
             object.has_unpublished_changes = True
             # Instead set the approved_go_live_at of this revision
             revision.approved_go_live_at = object.go_live_at
-            revision.save()
+            revision.save(update_fields=["approved_go_live_at"])
             # And clear the approved_go_live_at of any other revisions
             object.revisions.exclude(id=revision.id).update(approved_go_live_at=None)
             # if we are updating a currently live object skip the rest