```ruby
class CreateAccounts < ActiveRecord::Migration
  def change
    create_table :accounts do |t|

      t.timestamps null: false
    end
  end
end
```

Add balance to the accounts
user
```ruby
class CreateAccounts < ActiveRecord::Migration
  def change
    create_table :accounts do |t|
      t.integer 'user_id'
      t.decimal 'balance'
      t.timestamps null: false
    end
  end
end
```
assistant