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junhong_cmp_fiber/migrations/archive/000100_remove_carrier_billing_day.up.sql

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-- 删除运营商计费日字段
-- billing_day 从未被业务代码引用,实际使用的是 data_reset_day网关重置日
-- 两个字段功能重叠且 billing_day 从未被实际使用,故删除以清理表结构
ALTER TABLE tb_carrier DROP COLUMN IF EXISTS billing_day;