-- pbl_evidence 表 DDL（自动生成，与 apps/pbls/scripts/ddl/pbls_tables.sql 同源）
CREATE TABLE IF NOT EXISTS `pbl_artifact` (
  `tenant_id` VARCHAR(32) NOT NULL NOT NULL COMMENT 租户ID(强制打头),
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 主键,
  `artifact_uid` VARCHAR(32) NOT NULL COMMENT "产出UID",
  `session_id` BIGINT UNSIGNED NOT NULL COMMENT "会话",
  `blueprint_id` BIGINT UNSIGNED NOT NULL COMMENT "蓝图",
  `team_id` BIGINT UNSIGNED NOT NULL COMMENT "团队",
  `creator_id` VARCHAR(32) NOT NULL COMMENT "作者",
  `title` VARCHAR(128) NOT NULL COMMENT "标题",
  `artifact_type` VARCHAR(64) NOT NULL COMMENT "类型",
  `content_json` LONGTEXT NULL COMMENT "内容",
  `version_no` INT NOT NULL DEFAULT 0 COMMENT "版本",
  `status` VARCHAR(64) NOT NULL COMMENT "状态",
  `submitted_at` DATETIME NULL NULL COMMENT "提交时间",
  `created_at` DATETIME NOT NULL DEFAULT '1970-01-01 00:00:00' COMMENT "创建时间(应用层写入)",
  `updated_at` DATETIME NOT NULL DEFAULT '1970-01-01 00:00:00' COMMENT "更新时间(应用层写入)",
  PRIMARY KEY (`id`),
  UNIQUE KEY `uk_art_uid` (`tenant_id`, `artifact_uid`),
  KEY `idx_art_session` (`tenant_id`, `session_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci COMMENT="学生产出物（版本内联 version_no）";

CREATE TABLE IF NOT EXISTS `pbl_evidence` (
  `tenant_id` VARCHAR(32) NOT NULL NOT NULL COMMENT 租户ID(强制打头),
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 主键,
  `artifact_id` BIGINT UNSIGNED NOT NULL COMMENT "产出物",
  `evidence_type` VARCHAR(64) NOT NULL COMMENT "证据类型",
  `source_event_id` VARCHAR(32) NOT NULL COMMENT "来源 runtime_event",
  `session_id` BIGINT UNSIGNED NOT NULL COMMENT "会话",
  `learner_id` VARCHAR(32) NOT NULL COMMENT "学习者",
  `blueprint_id` BIGINT UNSIGNED NOT NULL COMMENT "蓝图",
  `payload_json` LONGTEXT NULL COMMENT "证据体",
  `occurred_at` DATETIME NOT NULL COMMENT "发生时间",
  `dedup_key` VARCHAR(32) NOT NULL COMMENT "去重键",
  `created_at` DATETIME NOT NULL DEFAULT '1970-01-01 00:00:00' COMMENT "创建时间(应用层写入)",
  `updated_at` DATETIME NOT NULL DEFAULT '1970-01-01 00:00:00' COMMENT "更新时间(应用层写入)",
  PRIMARY KEY (`id`),
  UNIQUE KEY `uk_ev_dedup` (`tenant_id`, `source_event_id`, `evidence_type`),
  KEY `idx_ev_learner` (`tenant_id`, `learner_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci COMMENT="学习证据（幂等采集，唯一索引防重）";