[
  {
    "type": "alter_table",
    "description": "Add queues column to task_workers for tracking which queues each worker monitors",
    "database": "kiosk_buykiosk",
    "check_query": "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'kiosk_buykiosk' AND TABLE_NAME = 'task_workers' AND COLUMN_NAME = 'queues'",
    "sql": "ALTER TABLE `task_workers` ADD COLUMN `queues` VARCHAR(200) DEFAULT 'high,default,low' COMMENT 'Comma-separated list of queues this worker monitors' AFTER `pid`"
  }
]