```ruby
class CreateProviders < ActiveRecord::Migration
  def change
    create_table :providers do |t|
      t.string :name, null: false, default: nil
      t.string :identifier, null: false, default: nil
      t.timestamps
    end
  end
end
```

Add description column to providers table
user
```ruby
class CreateProviders < ActiveRecord::Migration
  def change
    create_table :providers do |t|
      t.string :name, null: false, default: nil
      t.string :description, null: true, default: nil
      t.string :identifier, null: false, default: nil
      t.timestamps
    end
  end
end
```
assistant