Add order items

migrations/000037_add_quantity_to_payment_order_items.down.sql

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+-- Remove quantity field from payment_order_items table
+ALTER TABLE payment_order_items 
+DROP COLUMN quantity; 

migrations/000037_add_quantity_to_payment_order_items.up.sql

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+-- Add quantity field to payment_order_items table
+ALTER TABLE payment_order_items 
+ADD COLUMN quantity INTEGER NOT NULL DEFAULT 0;
+
+-- Add comment to explain the field
+COMMENT ON COLUMN payment_order_items.quantity IS 'Quantity paid for this specific payment split';