-- xuchao: 修复历史迁移缺口。早期这些表是用 drizzle push/手工 DDL 建进生产的,
-- 仓库里一直没有对应迁移,导致全新数据库建不出这些表。本迁移全部幂等:
-- 表已存在则 CREATE TABLE IF NOT EXISTS 跳过,生产库重复执行无副作用。
CREATE TABLE IF NOT EXISTS `grammar_point` (
	`id` bigint AUTO_INCREMENT NOT NULL,
	`point_id` varchar(191) NOT NULL,
	`level` varchar(20) NOT NULL,
	`level_name` varchar(50) NOT NULL,
	`title` varchar(200) NOT NULL,
	`difficulty` int NOT NULL DEFAULT 1,
	`summary` text,
	`prereq` text,
	`md` mediumtext NOT NULL,
	`seq` int NOT NULL,
	`updated_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
	CONSTRAINT `grammar_point_id` PRIMARY KEY(`id`),
	CONSTRAINT `uq_grammar_point_id` UNIQUE(`point_id`)
);
--> statement-breakpoint
CREATE TABLE IF NOT EXISTS `weekly_test` (
	`id` bigint AUTO_INCREMENT NOT NULL,
	`child_user_id` bigint NOT NULL,
	`week_key` varchar(12) NOT NULL,
	`score` int,
	`correct` int,
	`total` int,
	`passed` boolean NOT NULL DEFAULT false,
	`questions` mediumtext,
	`taken_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
	CONSTRAINT `weekly_test_id` PRIMARY KEY(`id`),
	CONSTRAINT `uq_weekly_child_week` UNIQUE(`child_user_id`,`week_key`),
	CONSTRAINT `fk_wt_child` FOREIGN KEY (`child_user_id`) REFERENCES `user`(`id`) ON DELETE cascade ON UPDATE no action
);
--> statement-breakpoint
CREATE TABLE IF NOT EXISTS `word_progress` (
	`id` bigint AUTO_INCREMENT NOT NULL,
	`child_user_id` bigint NOT NULL,
	`day` int NOT NULL,
	`learned` mediumtext,
	`score` int,
	`passed` boolean NOT NULL DEFAULT false,
	`completed_at` datetime,
	CONSTRAINT `word_progress_id` PRIMARY KEY(`id`),
	CONSTRAINT `uq_word_child_day` UNIQUE(`child_user_id`,`day`),
	CONSTRAINT `fk_wp_child` FOREIGN KEY (`child_user_id`) REFERENCES `user`(`id`) ON DELETE cascade ON UPDATE no action
);
--> statement-breakpoint
CREATE TABLE IF NOT EXISTS `word_recording` (
	`id` bigint AUTO_INCREMENT NOT NULL,
	`child_user_id` bigint NOT NULL,
	`word` varchar(60) NOT NULL,
	`day` int,
	`oss_key` varchar(300) NOT NULL,
	`created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
	CONSTRAINT `word_recording_id` PRIMARY KEY(`id`),
	KEY `idx_rec_child` (`child_user_id`),
	CONSTRAINT `fk_wr_child` FOREIGN KEY (`child_user_id`) REFERENCES `user`(`id`) ON DELETE cascade ON UPDATE no action
);
--> statement-breakpoint
CREATE TABLE IF NOT EXISTS `wrong_book` (
	`id` bigint AUTO_INCREMENT NOT NULL,
	`child_user_id` bigint NOT NULL,
	`source_type` varchar(10) NOT NULL,
	`source_id` varchar(60) NOT NULL,
	`source_title` varchar(200),
	`question` mediumtext NOT NULL,
	`user_answer` mediumtext,
	`correct_answer` mediumtext,
	`mastered` boolean NOT NULL DEFAULT false,
	`created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
	`updated_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
	CONSTRAINT `wrong_book_id` PRIMARY KEY(`id`),
	KEY `idx_wrong_child` (`child_user_id`,`mastered`),
	CONSTRAINT `fk_wb_child` FOREIGN KEY (`child_user_id`) REFERENCES `user`(`id`) ON DELETE cascade ON UPDATE no action
);
--> statement-breakpoint
-- grammar_progress:0002 误用 seq 列建表,生产实际是 point_id。仅在缺 point_id 时转换。
-- 顺序关键:先加 point_id 与 uq_grammar_child_point(child_user_id 为最左前缀,可承接外键),
-- 之后才能安全删除被外键依赖的旧索引 uq_grammar_child_seq,全程不动外键本身。
SET @gp_has_point = (SELECT COUNT(*) FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'grammar_progress' AND column_name = 'point_id');
--> statement-breakpoint
SET @ddl = IF(@gp_has_point = 0, 'ALTER TABLE `grammar_progress` ADD COLUMN `point_id` varchar(191) NOT NULL', 'SELECT 1');
--> statement-breakpoint
PREPARE stmt FROM @ddl;
--> statement-breakpoint
EXECUTE stmt;
--> statement-breakpoint
DEALLOCATE PREPARE stmt;
--> statement-breakpoint
SET @gp_has_point_idx = (SELECT COUNT(*) FROM information_schema.statistics WHERE table_schema = DATABASE() AND table_name = 'grammar_progress' AND index_name = 'uq_grammar_child_point');
--> statement-breakpoint
SET @ddl = IF(@gp_has_point_idx = 0, 'ALTER TABLE `grammar_progress` ADD CONSTRAINT `uq_grammar_child_point` UNIQUE (`child_user_id`,`point_id`)', 'SELECT 1');
--> statement-breakpoint
PREPARE stmt FROM @ddl;
--> statement-breakpoint
EXECUTE stmt;
--> statement-breakpoint
DEALLOCATE PREPARE stmt;
--> statement-breakpoint
SET @gp_has_seq_idx = (SELECT COUNT(*) FROM information_schema.statistics WHERE table_schema = DATABASE() AND table_name = 'grammar_progress' AND index_name = 'uq_grammar_child_seq');
--> statement-breakpoint
SET @ddl = IF(@gp_has_seq_idx > 0, 'ALTER TABLE `grammar_progress` DROP INDEX `uq_grammar_child_seq`', 'SELECT 1');
--> statement-breakpoint
PREPARE stmt FROM @ddl;
--> statement-breakpoint
EXECUTE stmt;
--> statement-breakpoint
DEALLOCATE PREPARE stmt;
--> statement-breakpoint
SET @gp_has_seq = (SELECT COUNT(*) FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'grammar_progress' AND column_name = 'seq');
--> statement-breakpoint
SET @ddl = IF(@gp_has_seq > 0, 'ALTER TABLE `grammar_progress` DROP COLUMN `seq`', 'SELECT 1');
--> statement-breakpoint
PREPARE stmt FROM @ddl;
--> statement-breakpoint
EXECUTE stmt;
--> statement-breakpoint
DEALLOCATE PREPARE stmt;