Gab Social. All are welcome.

db/migrate/20170507141759_optimize_index_subscriptions.rb

@@ -0,0 +1,11 @@
+class OptimizeIndexSubscriptions < ActiveRecord::Migration[5.0]
+  def up
+    add_index :subscriptions, [:account_id, :callback_url], unique: true
+    remove_index :subscriptions, [:callback_url, :account_id]
+  end
+
+  def down
+    add_index :subscriptions, [:callback_url, :account_id], unique: true
+    remove_index :subscriptions, [:account_id, :callback_url]
+  end
+end