FIX: remove faulty "ensure consistency" badge job

db/migrate/20140809224243_add_user_badge_unique_index.rb

@@ -0,0 +1,34 @@
+class AddUserBadgeUniqueIndex < ActiveRecord::Migration
+  def up
+    # used to keep badges distinct
+    add_column :user_badges, :seq, :integer, default: 0, null: false
+
+    # invent artificial seq for badges
+    execute "
+      UPDATE user_badges ub1 SET seq = X.seq
+      FROM (
+        SELECT ub.id, rank() OVER (PARTITION BY user_id ORDER BY granted_at) seq
+        FROM user_badges ub
+        JOIN badges b ON b.id = ub.badge_id
+        WHERE b.multiple_grant
+      ) X
+      WHERE ub1.id = X.id
+    "
+
+    # delete all single award dupes
+    execute "
+      DELETE FROM user_badges ub1
+      WHERE ub1.id NOT IN (
+        SELECT MIN(ub.id)
+        FROM user_badges ub
+        GROUP BY ub.user_id, ub.badge_id, ub.seq
+      )
+    "
+
+    add_index :user_badges, [:badge_id, :user_id, :seq], unique: true, where: 'post_id IS NULL'
+  end
+
+  def down
+    remove_column :user_badges, :seq, :integer
+  end
+end