-- 全平台统一使用积分（POINT）作为结算货币，不再使用人民币（CNY）。
ALTER TABLE merchant_products ALTER COLUMN currency SET DEFAULT 'POINT';
ALTER TABLE wallet_accounts ALTER COLUMN currency SET DEFAULT 'POINT';
ALTER TABLE fulfillment_orders ALTER COLUMN currency SET DEFAULT 'POINT';
UPDATE merchant_products SET currency = 'POINT' WHERE currency = 'CNY';
UPDATE wallet_accounts SET currency = 'POINT' WHERE currency = 'CNY';
UPDATE fulfillment_orders SET currency = 'POINT' WHERE currency = 'CNY';