hi-server/initialize/migrate/database/02153_user_subscribe_speed_limit.up.sql

ALTER TABLE `user_subscribe`
  ADD COLUMN IF NOT EXISTS `speed_limit` BIGINT NOT NULL DEFAULT 0 COMMENT 'User-level speed limit override (Mbps), 0 uses plan-level',
  ADD COLUMN IF NOT EXISTS `traffic_limit` TEXT DEFAULT NULL COMMENT 'User-level traffic limit override (JSON), NULL uses plan-level';