-- Add matter reference so signup records are unique per travel period/matter.
ALTER TABLE `tour_ledger`
  ADD COLUMN `matterId` varchar(32) DEFAULT NULL COMMENT '报名事项ID' AFTER `signupTime`;

ALTER TABLE `tour_ledger`
  ADD KEY `idx_tour_ledger_matter` (`matterId`),
  ADD KEY `idx_tour_ledger_matter_job` (`matterId`, `jobNo`);