[
  {
    "type": "alter_table",
    "description": "Add claimedAt column to scheduleShifts to track when open shifts are claimed - Spec 022",
    "database": "{{store}}",
    "check_query": "SHOW COLUMNS FROM scheduleShifts LIKE 'claimedAt'",
    "sql": "ALTER TABLE `scheduleShifts` ADD COLUMN `claimedAt` datetime DEFAULT NULL COMMENT 'Timestamp when this open shift was claimed by an employee' AFTER `publishedByUserId`"
  }
]