-- +goose Up
ALTER TABLE freight_order_items
    ADD COLUMN original_unit_price_minor INTEGER
        CHECK (original_unit_price_minor IS NULL OR original_unit_price_minor >= 0);

ALTER TABLE freight_order_items
    ADD COLUMN original_currency TEXT NOT NULL DEFAULT 'TWD'
        CHECK (original_currency = 'TWD');

-- +goose Down
CREATE TEMP TABLE freight_item_metadata_v15_down_guard (
    allowed INTEGER NOT NULL CHECK (allowed = 1)
);

INSERT INTO freight_item_metadata_v15_down_guard (allowed)
SELECT CASE
    WHEN EXISTS (
        SELECT 1
        FROM freight_order_items
        WHERE original_unit_price_minor IS NOT NULL
    )
    THEN 0
    ELSE 1
END;

DROP TABLE freight_item_metadata_v15_down_guard;

ALTER TABLE freight_order_items DROP COLUMN original_currency;
ALTER TABLE freight_order_items DROP COLUMN original_unit_price_minor;