FIX: The dates for retroactive anniversary badges were wrong

app/jobs/onceoff/fix_retro_anniversary.rb

@@ -0,0 +1,34 @@
+require_dependency 'jobs/scheduled/grant_anniversary_badges'
+
+module Jobs
+
+  class FixRetroAnniversary < Jobs::Onceoff
+    def execute_onceoff(args)
+      return unless SiteSetting.enable_badges
+
+      users = User.exec_sql <<~SQL
+        SELECT ub.user_id, MIN(granted_at) AS first_granted_at, COUNT(*)
+        FROM user_badges AS ub
+        WHERE ub.badge_id = #{Badge::Anniversary}
+        GROUP BY ub.user_id
+        HAVING COUNT(ub.id) > 1
+      SQL
+
+      users.to_a.each do |u|
+        first = Time.zone.parse(u['first_granted_at'])
+        badges = UserBadge.where(
+          "badge_id = ? AND user_id = ? AND granted_at > ?",
+          Badge::Anniversary,
+          u['user_id'],
+          first
+        ).order('granted_at')
+
+        badges.each_with_index do |b, idx|
+          award_date = (first + (idx + 1).years)
+          UserBadge.where(id: b['id']).update_all(["granted_at = ?", award_date])
+        end
+      end
+
+    end
+  end
+end