# 头衔表设计DDL（含事务与字段说明）

## 字段说明

* system\_titles：`id`、`name`、`description`、`status`、`obtain_rules_json`、`scopes_json`、`created_at`、`updated_at`

* system\_title\_effects：`id`、`title_id`、`effect_type`、`params_json`、`stacking_strategy`、`cap_value_x1000`、`scopes_json`、`sort`、`status`、`created_at`

* user\_titles：`id`、`user_id`、`title_id`、`active`、`obtained_at`、`expires_at`、`source`、`remark`、`created_at`

* user\_title\_effect\_claims：`id`、`user_id`、`title_id`、`effect_type`、`target_template_id`、`period_key`、`claim_count`、`last_claim_at`、`created_at`

* activity\_draw\_effects 扩展：`source_type`、`source_id`

## 事务化SQL（先删表再新建，含COMMIT）

```sql
START TRANSACTION;
SET FOREIGN_KEY_CHECKS=0;

DROP TABLE IF EXISTS `system_title_effects`;
DROP TABLE IF EXISTS `user_title_effect_claims`;
DROP TABLE IF EXISTS `user_titles`;
DROP TABLE IF EXISTS `system_titles`;

CREATE TABLE `system_titles` (
  `id` BIGINT PRIMARY KEY AUTO_INCREMENT,
  `name` VARCHAR(64) NOT NULL,
  `description` VARCHAR(255) NULL,
  `status` TINYINT NOT NULL DEFAULT 1,
  `obtain_rules_json` JSON NULL,
  `scopes_json` JSON NULL,
  `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  `updated_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  UNIQUE KEY `uk_system_titles_name` (`name`),
  INDEX `idx_system_titles_status` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `system_title_effects` (
  `id` BIGINT PRIMARY KEY AUTO_INCREMENT,
  `title_id` BIGINT NOT NULL,
  `effect_type` INT NOT NULL,
  `params_json` JSON NOT NULL,
  `stacking_strategy` INT NOT NULL DEFAULT 0,
  `cap_value_x1000` INT NULL,
  `scopes_json` JSON NULL,
  `sort` INT NOT NULL DEFAULT 0,
  `status` TINYINT NOT NULL DEFAULT 1,
  `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  CONSTRAINT `fk_title_effects_title` FOREIGN KEY (`title_id`) REFERENCES `system_titles`(`id`) ON DELETE CASCADE,
  INDEX `idx_title_effects_title` (`title_id`),
  INDEX `idx_title_effects_type` (`effect_type`),
  INDEX `idx_title_effects_status` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `user_titles` (
  `id` BIGINT PRIMARY KEY AUTO_INCREMENT,
  `user_id` BIGINT NOT NULL,
  `title_id` BIGINT NOT NULL,
  `active` TINYINT NOT NULL DEFAULT 1,
  `obtained_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  `expires_at` DATETIME(3) NULL,
  `source` VARCHAR(64) NULL,
  `remark` VARCHAR(255) NULL,
  `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  CONSTRAINT `fk_user_titles_title` FOREIGN KEY (`title_id`) REFERENCES `system_titles`(`id`) ON DELETE CASCADE,
  UNIQUE KEY `uk_user_title_unique` (`user_id`, `title_id`),
  INDEX `idx_user_titles_user` (`user_id`),
  INDEX `idx_user_titles_active` (`active`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `user_title_effect_claims` (
  `id` BIGINT PRIMARY KEY AUTO_INCREMENT,
  `user_id` BIGINT NOT NULL,
  `title_id` BIGINT NOT NULL,
  `effect_type` INT NOT NULL,
  `target_template_id` BIGINT NULL,
  `period_key` VARCHAR(16) NOT NULL,
  `claim_count` INT NOT NULL DEFAULT 0,
  `last_claim_at` DATETIME(3) NULL,
  `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  CONSTRAINT `fk_claims_title` FOREIGN KEY (`title_id`) REFERENCES `system_titles`(`id`) ON DELETE CASCADE,
  UNIQUE KEY `uk_title_claim_period` (`user_id`, `title_id`, `effect_type`, `target_template_id`, `period_key`),
  INDEX `idx_title_claims_user` (`user_id`),
  INDEX `idx_title_claims_effect` (`effect_type`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

ALTER TABLE `activity_draw_effects`
  ADD COLUMN `source_type` INT NOT NULL DEFAULT 0,
  ADD COLUMN `source_id` BIGINT NULL,
  ADD INDEX `idx_draw_effects_source` (`source_type`, `source_id`);

SET FOREIGN_KEY_CHECKS=1;
COMMIT;
```

## 说明

* `period_key`：按策略生成（如每日`YYYYMMDD`、每周`YYYYWW`、每月`YYYYMM`）。

* 事务与外键检查切换保障迁移原子性与顺序删除/创建。