[
  {
    "type": "alter_table",
    "description": "Add appId column to userDeviceTokens for multi-project FCM routing",
    "database": "kiosk_users",
    "check_query": "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'kiosk_users' AND TABLE_NAME = 'userDeviceTokens' AND COLUMN_NAME = 'appId'",
    "sql": "ALTER TABLE `userDeviceTokens` ADD COLUMN `appId` VARCHAR(20) NOT NULL DEFAULT 'team' AFTER `appVersion`, ADD KEY `idx_appId` (`appId`)"
  }
]