CREATE TABLE `grammar_progress` (
	`id` bigint AUTO_INCREMENT NOT NULL,
	`child_user_id` bigint NOT NULL,
	`seq` int NOT NULL,
	`score` int,
	`passed` boolean NOT NULL DEFAULT false,
	`completed_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
	CONSTRAINT `grammar_progress_id` PRIMARY KEY(`id`),
	CONSTRAINT `uq_grammar_child_seq` UNIQUE(`child_user_id`,`seq`)
);
--> statement-breakpoint
ALTER TABLE `grammar_progress` ADD CONSTRAINT `grammar_progress_child_user_id_user_id_fk` FOREIGN KEY (`child_user_id`) REFERENCES `user`(`id`) ON DELETE cascade ON UPDATE no action;