[
  {
    "type": "alter_table",
    "description": "Add surveySent flag to buyQueue so post-buy survey SMS is only ever sent once per buy (prevents duplicate survey floods).",
    "database": "{{store}}",
    "check_query": "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'buyQueue' AND COLUMN_NAME = 'surveySent'",
    "sql": "ALTER TABLE `buyQueue` ADD COLUMN `surveySent` TINYINT(1) NOT NULL DEFAULT 0 COMMENT 'Set to 1 once the post-checkout survey SMS has been claimed/sent; prevents duplicate sends.'"
  }
]