```ruby
module Spree
  module AdjustmentSource
    extend ActiveSupport::Concern

    included do
      def deals_with_adjustments_for_deleted_source
        adjustment_scope = self.adjustments.includes(:order).references(:spree_orders)

        # For incomplete orders, remove the adjustment completely.
        adjustment_scope.where("spree_orders.completed_at IS NULL").destroy_all

        # For complete orders, the source will be invalid.
        # Therefore we nullify the source_id, leaving the adjustment in place.
        # This would mean that the order's total is not altered at all.
        adjustment_scope.where("spree_orders.completed_at IS NOT NULL").each do |adjustment|
          adjustment.update_columns(
            source_id: nil,
            updated_at: Time.now,
          )
        end
      end
    end
  end
end
```

Move all calculations to DB in AdjustmentSource
user
```ruby
module Spree
  module AdjustmentSource
    extend ActiveSupport::Concern

    included do
      def deals_with_adjustments_for_deleted_source
        adjustment_scope = self.adjustments.joins(:order)

        # For incomplete orders, remove the adjustment completely.
        adjustment_scope.where(spree_orders: { completed_at: nil }).destroy_all

        # For complete orders, the source will be invalid.
        # Therefore we nullify the source_id, leaving the adjustment in place.
        # This would mean that the order's total is not altered at all.
        attrs = {
          source_id: nil,
          updated_at: Time.now
        }
        adjustment_scope.where.not(spree_orders: { completed_at: nil }).update_all(attrs)
      end
    end
  end
end
```
assistant