That column is obsolete since we added the `granted_title_badge_id` column in 2019 (56d3e29a69). Having both columns can lead to inconsistencies (mostly due to old data from before 2019).
For example, `BadgeGranter.revoke_ungranted_titles!` doesn't work correctly if `badge_granted_title` is `false` while `granted_title_badge_id` points to the badge that is used as title.
Gerhard Schlager