correct regression and add integrity spec for onceoffs

app/jobs/onceoff/fix_retro_anniversary.rb

@@ -6,15 +6,15 @@ module Jobs
     def execute_onceoff(args)
       return unless SiteSetting.enable_badges
 
-      users = User.query <<~SQL
-        SELECT ub.user_id, MIN(granted_at) AS first_granted_at, COUNT(*)
+      users = DB.query <<~SQL
+        SELECT ub.user_id, MIN(granted_at) AS first_granted_at, COUNT(*) 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|
+      users.each do |u|
         first = u.first_granted_at
         badges = UserBadge.where(
           "badge_id = ? AND user_id = ? AND granted_at > ?",

spec/integrity/onceoff_integrity_spec.rb

@@ -0,0 +1,14 @@
+require "rails_helper"
+
+describe Jobs::Onceoff do
+  it "can run all once off jobs without errors" do
+    # load all once offs
+
+    Dir[Rails.root + 'app/jobs/onceoff/*.rb'].each do |f|
+      require_relative '../../app/jobs/onceoff/' + File.basename(f)
+    end
+    ObjectSpace.each_object(Class).select { |klass| klass < Jobs::Onceoff }.each do |j|
+      j.new.execute_onceoff(nil)
+    end
+  end
+end