from tortoise import BaseDBAsyncClient


async def upgrade(db: BaseDBAsyncClient) -> str:
    return """
        ALTER TABLE `shop` MODIFY COLUMN `province` VARCHAR(255)   COMMENT '省份';"""


async def downgrade(db: BaseDBAsyncClient) -> str:
    return """
        ALTER TABLE `shop` MODIFY COLUMN `province` VARCHAR(255) NOT NULL  COMMENT '省份';"""