YuruToot/db/migrate/20170424003227_create_account_domain_blocks.rb

class CreateAccountDomainBlocks < ActiveRecord::Migration[5.0]
  def change
    create_table :account_domain_blocks do |t|
      t.integer :account_id
      t.string :domain

      t.timestamps
    end

    add_index :account_domain_blocks, [:account_id, :domain], unique: true
  end
end