[
  {
    "type": "create_table",
    "description": "Create userGroups table for user-to-group membership",
    "database": "kiosk_users",
    "check_query": "SHOW TABLES LIKE 'userGroups'",
    "sql": "CREATE TABLE `userGroups` (\n  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,\n  `userId` int(10) unsigned NOT NULL COMMENT 'FK to users.id',\n  `groupId` int(10) unsigned NOT NULL COMMENT 'FK to uf_group.id',\n  `createdAt` timestamp NOT NULL DEFAULT current_timestamp(),\n  PRIMARY KEY (`id`),\n  UNIQUE KEY `uk_user_group` (`userId`, `groupId`),\n  KEY `idx_userId` (`userId`),\n  KEY `idx_groupId` (`groupId`),\n  CONSTRAINT `fk_userGroups_user` FOREIGN KEY (`userId`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='User to permission group membership'"
  }
]