-- Forum Phase 5: Achievement system + topic subscriptions

CREATE TABLE `achievements` (
  `key`         VARCHAR(50)  NOT NULL,
  `name`        VARCHAR(50)  NOT NULL,
  `description` VARCHAR(200) NOT NULL,
  `icon`        VARCHAR(20)  NOT NULL,
  `tier`        VARCHAR(20)  NOT NULL DEFAULT 'bronze',
  `points`      INT          NOT NULL DEFAULT 0,
  `category`    VARCHAR(30)  NOT NULL DEFAULT 'general',
  `sort_order`  INT          NOT NULL DEFAULT 0,
  `is_active`   BOOLEAN      NOT NULL DEFAULT TRUE,
  `created_at`  DATETIME(3)  NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  PRIMARY KEY (`key`),
  INDEX `achievements_category_is_active_sort_order_idx`(`category`, `is_active`, `sort_order`)
);

CREATE TABLE `user_achievements` (
  `id`               INT          NOT NULL AUTO_INCREMENT,
  `user_id`          INT          NOT NULL,
  `achievement_key`  VARCHAR(50)  NOT NULL,
  `progress`         INT          NOT NULL DEFAULT 0,
  `unlocked_at`      DATETIME(3)  NULL,
  `notified_at`      DATETIME(3)  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),
  PRIMARY KEY (`id`),
  UNIQUE INDEX `user_achievements_user_id_achievement_key_key`(`user_id`, `achievement_key`),
  INDEX `user_achievements_user_id_unlocked_at_idx`(`user_id`, `unlocked_at`),
  INDEX `user_achievements_achievement_key_idx`(`achievement_key`)
);

CREATE TABLE `forum_topic_subscriptions` (
  `id`           INT          NOT NULL AUTO_INCREMENT,
  `topic_id`     INT          NOT NULL,
  `user_id`      INT          NOT NULL,
  `notify_reply` BOOLEAN      NOT NULL DEFAULT TRUE,
  `created_at`   DATETIME(3)  NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  PRIMARY KEY (`id`),
  UNIQUE INDEX `forum_topic_subscriptions_topic_id_user_id_key`(`topic_id`, `user_id`),
  INDEX `forum_topic_subscriptions_user_id_created_at_idx`(`user_id`, `created_at`)
);