```ruby
class RemoveGlobalHTTPStatusColumn < ActiveRecord::Migration
  def change
    remove_column :sites, :global_http_status
  end
end
```

Change the remove_global_http_status_column migration to be reversible
user
```ruby
class RemoveGlobalHTTPStatusColumn < ActiveRecord::Migration
  def up
    remove_column :sites, :global_http_status
  end

  def down
    add_column :sites, :global_http_status, :string, :limit => 3
  end
end
```
assistant