[
  {
    "type": "alter_table",
    "description": "Add optional description field to categories table",
    "database": "kiosk_sales",
    "sql": "ALTER TABLE `categories` ADD COLUMN IF NOT EXISTS `description` VARCHAR(25) DEFAULT NULL"
  },
  {
    "type": "alter_table",
    "description": "Add optional description field to subcategories table",
    "database": "kiosk_sales",
    "sql": "ALTER TABLE `subcategories` ADD COLUMN IF NOT EXISTS `description` VARCHAR(25) DEFAULT NULL"
  }
]