feat: 添加realtime_dialog和realtime_dialog_external_rag_test项目，更新test2项目

test2/server/db/index.js

@@ -2,6 +2,23 @@ const mysql = require('mysql2/promise');
 
 let pool = null;
 
+async function ensureColumnExists(tableName, columnName, definitionSql) {
+  const [rows] = await pool.query(`SHOW COLUMNS FROM \`${tableName}\` LIKE ?`, [columnName]);
+  if (rows.length === 0) {
+    await pool.execute(`ALTER TABLE \`${tableName}\` ADD COLUMN ${definitionSql}`);
+  }
+}
+
+async function migrateSchema() {
+  await pool.execute("ALTER TABLE `sessions` MODIFY COLUMN `mode` ENUM('voice', 'chat') DEFAULT 'chat'");
+  await pool.execute("ALTER TABLE `messages` MODIFY COLUMN `role` ENUM('user', 'assistant', 'tool', 'system') NOT NULL");
+  await pool.execute("ALTER TABLE `messages` MODIFY COLUMN `source` ENUM('voice_asr', 'voice_bot', 'voice_tool', 'chat_user', 'chat_bot') NOT NULL");
+  await ensureColumnExists('messages', 'tool_name', '`tool_name` VARCHAR(64) NULL AFTER `source`');
+  await ensureColumnExists('messages', 'meta_json', '`meta_json` JSON NULL AFTER `tool_name`');
+  await ensureColumnExists('messages', 'created_at', '`created_at` BIGINT NULL AFTER `tool_name`');
+  await ensureColumnExists('sessions', 'updated_at', '`updated_at` BIGINT NULL AFTER `created_at`');
+}
+
 /**
  * 初始化 MySQL 连接池 + 自动建表
  */
@@ -50,12 +67,15 @@ async function initialize() {
       content TEXT NOT NULL,
       source ENUM('voice_asr', 'voice_bot', 'voice_tool', 'chat_user', 'chat_bot') NOT NULL,
       tool_name VARCHAR(64),
+      meta_json JSON,
       created_at BIGINT,
       INDEX idx_session (session_id),
       INDEX idx_session_time (session_id, created_at)
     ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
   `);
 
+  await migrateSchema();
+
   console.log(`[DB] MySQL connected: ${dbName}, tables ready`);
   return pool;
 }
@@ -93,22 +113,23 @@ async function getSession(sessionId) {
 
 // ==================== Messages ====================
 
-async function addMessage(sessionId, role, content, source, toolName = null) {
+async function addMessage(sessionId, role, content, source, toolName = null, meta = null) {
   if (!content || content.trim() === '') return null;
   const now = Date.now();
+  const metaJson = meta == null ? null : JSON.stringify(meta);
   const [result] = await pool.execute(
-    'INSERT INTO messages (session_id, role, content, source, tool_name, created_at) VALUES (?, ?, ?, ?, ?, ?)',
-    [sessionId, role, content, source, toolName, now]
+    'INSERT INTO messages (session_id, role, content, source, tool_name, meta_json, created_at) VALUES (?, ?, ?, ?, ?, ?, ?)',
+    [sessionId, role, content, source, toolName, metaJson, now]
   );
   // 更新 session 时间
   await pool.execute('UPDATE sessions SET updated_at=? WHERE id=?', [now, sessionId]);
-  return { id: result.insertId, session_id: sessionId, role, content, source, tool_name: toolName, created_at: now };
+  return { id: result.insertId, session_id: sessionId, role, content, source, tool_name: toolName, meta_json: metaJson, created_at: now };
 }
 
 async function getMessages(sessionId, limit = 20) {
   const safeLimit = Math.max(1, Math.min(parseInt(limit) || 20, 100));
   const [rows] = await pool.query(
-    'SELECT role, content, source, tool_name, created_at FROM messages WHERE session_id=? ORDER BY created_at ASC LIMIT ?',
+    'SELECT role, content, source, tool_name, meta_json, created_at FROM messages WHERE session_id=? ORDER BY created_at ASC LIMIT ?',
     [sessionId, safeLimit]
   );
   return rows;
@@ -118,7 +139,7 @@ async function getRecentMessages(sessionId, limit = 20) {
   // 获取最近 N 条，按时间正序返回
   const safeLimit = Math.max(1, Math.min(parseInt(limit) || 20, 100));
   const [rows] = await pool.query(
-    `SELECT role, content, source, tool_name, created_at FROM messages 
+    `SELECT role, content, source, tool_name, meta_json, created_at FROM messages 
      WHERE session_id=? ORDER BY created_at DESC LIMIT ?`,
     [sessionId, safeLimit]
   );
@@ -136,6 +157,38 @@ async function getHistoryForLLM(sessionId, limit = 20) {
     .map(m => ({ role: m.role, content: m.content }));
 }
 
+/**
+ * 获取会话列表（按更新时间倒序，带最后一条消息预览）
+ */
+async function getSessionList(userId, limit = 50) {
+  const safeLimit = Math.max(1, Math.min(parseInt(limit) || 50, 200));
+  let query;
+  let params;
+  if (userId) {
+    query = `SELECT s.id, s.user_id, s.mode, s.created_at, s.updated_at,
+      (SELECT content FROM messages WHERE session_id = s.id ORDER BY created_at DESC LIMIT 1) AS last_message,
+      (SELECT COUNT(*) FROM messages WHERE session_id = s.id) AS message_count
+      FROM sessions s WHERE s.user_id = ? ORDER BY s.updated_at DESC LIMIT ?`;
+    params = [userId, safeLimit];
+  } else {
+    query = `SELECT s.id, s.user_id, s.mode, s.created_at, s.updated_at,
+      (SELECT content FROM messages WHERE session_id = s.id ORDER BY created_at DESC LIMIT 1) AS last_message,
+      (SELECT COUNT(*) FROM messages WHERE session_id = s.id) AS message_count
+      FROM sessions s ORDER BY s.updated_at DESC LIMIT ?`;
+    params = [safeLimit];
+  }
+  const [rows] = await pool.query(query, params);
+  return rows;
+}
+
+/**
+ * 删除会话及其所有消息
+ */
+async function deleteSession(sessionId) {
+  await pool.execute('DELETE FROM messages WHERE session_id = ?', [sessionId]);
+  await pool.execute('DELETE FROM sessions WHERE id = ?', [sessionId]);
+}
+
 module.exports = {
   initialize,
   getPool,
@@ -146,4 +199,6 @@ module.exports = {
   getMessages,
   getRecentMessages,
   getHistoryForLLM,
+  getSessionList,
+  deleteSession,
 };