The ar_flags field in the archive table is going away, so the views will need to be adjusted to no longer try to select this column. You could make it constant null or constant empty string.

Also, while it's not directly relevant to this task, I note that the field has been empty in the production databases since T184629: Run maintenance/migrateArchiveText.php on all wikis was completed. And I can't think of any use for it without ar_text, which has never been exposed, so there's that too.