[index] Add 2 indexes on accounts table

db/migrate/20210117120100_add_indexes_on_accounts.rb

@@ -0,0 +1,8 @@
+class AddIndexesOnAccounts < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    add_index :accounts, :locked, algorithm: :concurrently
+    add_index :accounts, :domain, algorithm: :concurrently
+  end
+end