feat:历史记录分享功能实现

backend/db/schema.sql

@@ -62,9 +62,45 @@ CREATE TRIGGER update_multi_agent_tasks_updated_at
     FOR EACH ROW
     EXECUTE FUNCTION update_updated_at_column();
 
+-- =============================================================================
+-- 表3: export_records (导出记录)
+-- =============================================================================
+CREATE TABLE IF NOT EXISTS export_records (
+    id SERIAL PRIMARY KEY,
+    task_id VARCHAR(64) NOT NULL,
+    user_id VARCHAR(64) NOT NULL,
+    export_type VARCHAR(32) NOT NULL,
+    file_name VARCHAR(256) NOT NULL,
+    file_path VARCHAR(512) NOT NULL,
+    file_url VARCHAR(512),
+    file_size INTEGER DEFAULT 0,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_export_records_task_user ON export_records(task_id, user_id);
+
+-- =============================================================================
+-- 表4: plan_shares (任务分享记录)
+-- =============================================================================
+CREATE TABLE IF NOT EXISTS plan_shares (
+    id SERIAL PRIMARY KEY,
+    share_token VARCHAR(64) NOT NULL UNIQUE,
+    extraction_code VARCHAR(8),
+    task_id VARCHAR(64) NOT NULL,
+    task_data JSONB NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    expires_at TIMESTAMP WITH TIME ZONE,
+    view_count INTEGER DEFAULT 0
+);
+
+CREATE INDEX IF NOT EXISTS idx_plan_shares_token ON plan_shares(share_token);
+CREATE INDEX IF NOT EXISTS idx_plan_shares_task_id ON plan_shares(task_id);
+
 DO $$
 BEGIN
     RAISE NOTICE '✅ PostgreSQL 数据库表结构创建完成！';
     RAISE NOTICE '表: multi_agent_tasks (多智能体任务记录)';
     RAISE NOTICE '表: user_agents (用户智能体配置)';
+    RAISE NOTICE '表: export_records (导出记录)';
+    RAISE NOTICE '表: plan_shares (任务分享记录)';
 END $$;