diff --git a/db/log_client.py b/db/example_log_client.py
similarity index 62%
rename from db/log_client.py
rename to db/example_log_client.py
index d84d252..022b383 100644
--- a/db/log_client.py
+++ b/db/example_log_client.py
@@ -1,152 +1,185 @@
-"""
-统一日志客户端 — 各服务共用。
-
-设计要点：
-  - 使用 urllib.request（标准库，不引入 requests）
-  - 异步非阻塞：内存队列 + 后台线程批量推送，不拖慢业务
-  - fail-safe：db 服务不可用时静默丢弃，绝不影响业务
-  - 缓冲批量：队列满 50 条或超时 2 秒时自动 flush
-
-用法：
-    from log_client import logs
-
-    logs.info("dnfs", "节点新增成功 id=42")
-    logs.error("dnfs", "数据库连接失败", extra={"errno": 2002})
-    logs.push("gateway", "WARNING", "登录失败次数超限",
-              trace_id="req-abc", extra={"ip": "1.2.3.4"})
-"""
-
-import json
-import threading
-import queue
-import time
-import urllib.request
-import urllib.error
-import atexit
-
-# ── 配置 ──────────────────────────────────────────────────────────────
-
-DB_LOG_URL = 'http://127.0.0.1:8005/log/ingest'
-
-_BATCH_SIZE = 50         # 队列满 50 条时 flush
-_FLUSH_INTERVAL = 2.0    # 超时 2 秒强制 flush
-_TIMEOUT = 5             # HTTP 请求超时（秒）
-
-
-class LogClient:
-    """异步批量日志推送客户端。"""
-
-    def __init__(self, url=DB_LOG_URL, batch_size=_BATCH_SIZE,
-                 flush_interval=_FLUSH_INTERVAL):
-        self._url = url
-        self._batch_size = batch_size
-        self._flush_interval = flush_interval
-        self._queue = queue.Queue()
-        self._stop = threading.Event()
-        self._thread = threading.Thread(target=self._flush_loop,
-                                        daemon=True, name='log-client')
-        self._thread.start()
-        atexit.register(self._shutdown)
-
-    # ── 公开接口 ────────────────────────────────────────────────────────
-
-    def push(self, service, level, message, trace_id=None, extra=None):
-        """推送一条日志（非阻塞，立即返回）。"""
-        self._queue.put({
-            'service': service,
-            'level': level,
-            'message': message,
-            'trace_id': trace_id,
-            'extra': extra,
-        })
-
-    def debug(self, service, message, **kw):
-        self.push(service, 'DEBUG', message, **kw)
-
-    def info(self, service, message, **kw):
-        self.push(service, 'INFO', message, **kw)
-
-    def warning(self, service, message, **kw):
-        self.push(service, 'WARNING', message, **kw)
-
-    def error(self, service, message, **kw):
-        self.push(service, 'ERROR', message, **kw)
-
-    def critical(self, service, message, **kw):
-        self.push(service, 'CRITICAL', message, **kw)
-
-    def flush(self):
-        """手动 flush 队列中剩余的日志。"""
-        batch = []
-        while True:
-            try:
-                batch.append(self._queue.get_nowait())
-                if len(batch) >= self._batch_size:
-                    self._send(batch)
-                    batch = []
-            except queue.Empty:
-                break
-        if batch:
-            self._send(batch)
-
-    # ── 内部实现 ────────────────────────────────────────────────────────
-
-    def _flush_loop(self):
-        """后台线程：积攒到 batch_size 或超时 flush_interval 时发送。"""
-        batch = []
-        last_flush = time.monotonic()
-
-        while not self._stop.is_set():
-            timeout = max(0, self._flush_interval - (time.monotonic() - last_flush))
-            try:
-                item = self._queue.get(timeout=timeout)
-                batch.append(item)
-                # 继续非阻塞地取，直到满 batch_size
-                while len(batch) < self._batch_size:
-                    try:
-                        batch.append(self._queue.get_nowait())
-                    except queue.Empty:
-                        break
-            except queue.Empty:
-                pass  # 超时，没有新日志
-
-            # 满了或超时了就发
-            should_flush = (
-                len(batch) >= self._batch_size or
-                (batch and time.monotonic() - last_flush >= self._flush_interval)
-            )
-            if should_flush:
-                self._send(batch)
-                batch = []
-                last_flush = time.monotonic()
-
-        # 退出前 flush 剩余
-        if batch:
-            self._send(batch)
-
-    def _send(self, batch):
-        """发送一批日志到 db 服务。失败时静默丢弃。"""
-        data = json.dumps({'logs': batch}).encode('utf-8')
-        req = urllib.request.Request(
-            self._url, data=data,
-            headers={'Content-Type': 'application/json'},
-            method='POST'
-        )
-        try:
-            with urllib.request.urlopen(req, timeout=_TIMEOUT) as resp:
-                resp.read()  # 消费响应体
-        except (urllib.error.URLError, urllib.error.HTTPError, OSError):
-            # fail-safe：日志服务不可用，静默丢弃，不影响业务
-            pass
-        except Exception:
-            pass
-
-    def _shutdown(self):
-        """进程退出时 flush 剩余日志。"""
-        self._stop.set()
-        self.flush()
-
-
-# ── 全局单例 ──────────────────────────────────────────────────────────
-
-logs = LogClient()
+"""
+统一日志客户端 SDK — 各服务复制即用。
+
+设计要点：
+  - 通过 pymsg TCP 调用 dbv2 execute 路由，逐条 INSERT 到 Logs 表
+  - 异步非阻塞：内存队列 + 后台线程批量推送，不拖慢业务
+  - fail-safe：db 服务不可用时静默丢弃，绝不影响业务
+  - 缓冲批量：队列满 50 条或超时 2 秒时自动 flush
+
+复制到目标服务目录后，按需修改 service_name 即可：:
+
+    from log_client import logs
+
+    logs.info("dnfs", "节点新增成功 id=42")
+    logs.error("dnfs", "数据库连接失败", extra={"errno": 2002})
+    logs.push("gateway", "WARNING", "登录失败次数超限",
+              trace_id="req-abc", extra={"ip": "1.2.3.4"})
+"""
+
+import json
+import os as _os
+import sys as _sys
+import threading
+import queue
+import time
+import atexit
+from datetime import datetime, timezone
+
+_sys.path.insert(0, _os.path.join(_os.path.dirname(__file__), ".."))
+from pymsg import MsgClient  # noqa: E402
+
+# ── 配置 ──────────────────────────────────────────────────────────────
+
+_DBV2_ADDR = '127.0.0.1'
+_DBV2_PORT = 8005
+
+_BATCH_SIZE = 50         # 队列满 50 条时 flush
+_FLUSH_INTERVAL = 2.0    # 超时 2 秒强制 flush
+_TIMEOUT = 5             # socket 超时（秒）
+
+
+class LogClient:
+    """异步批量日志推送客户端。
+
+    通过 MsgClient（pymsg TCP 协议）逐条 INSERT 到 dbv2 的 Logs 表。
+    service_name 用于在 dbv2 连接中标识来源，各服务复制时自行修改。
+    """
+
+    def __init__(self, service_name="example",
+                 batch_size=_BATCH_SIZE,
+                 flush_interval=_FLUSH_INTERVAL):
+        self._service_name = service_name
+        self._batch_size = batch_size
+        self._flush_interval = flush_interval
+        self._queue = queue.Queue()
+        self._stop = threading.Event()
+        self._thread = threading.Thread(target=self._flush_loop,
+                                        daemon=True, name='log-client')
+        self._thread.start()
+        atexit.register(self._shutdown)
+
+    # ── 公开接口 ────────────────────────────────────────────────────────
+
+    def push(self, service, level, message, trace_id=None, extra=None):
+        """推送一条日志（非阻塞，立即返回）。"""
+        self._queue.put({
+            'service': service,
+            'level': level,
+            'message': message,
+            'trace_id': trace_id,
+            'extra': extra,
+        })
+
+    def debug(self, service, message, **kw):
+        self.push(service, 'DEBUG', message, **kw)
+
+    def info(self, service, message, **kw):
+        self.push(service, 'INFO', message, **kw)
+
+    def warning(self, service, message, **kw):
+        self.push(service, 'WARNING', message, **kw)
+
+    def error(self, service, message, **kw):
+        self.push(service, 'ERROR', message, **kw)
+
+    def critical(self, service, message, **kw):
+        self.push(service, 'CRITICAL', message, **kw)
+
+    def flush(self):
+        """手动 flush 队列中剩余的日志。"""
+        batch = []
+        while True:
+            try:
+                batch.append(self._queue.get_nowait())
+                if len(batch) >= self._batch_size:
+                    self._send(batch)
+                    batch = []
+            except queue.Empty:
+                break
+        if batch:
+            self._send(batch)
+
+    # ── 内部实现 ────────────────────────────────────────────────────────
+
+    def _flush_loop(self):
+        """后台线程：积攒到 batch_size 或超时 flush_interval 时发送。"""
+        batch = []
+        last_flush = time.monotonic()
+
+        while not self._stop.is_set():
+            timeout = max(0, self._flush_interval - (time.monotonic() - last_flush))
+            try:
+                item = self._queue.get(timeout=timeout)
+                batch.append(item)
+                # 继续非阻塞地取，直到满 batch_size
+                while len(batch) < self._batch_size:
+                    try:
+                        batch.append(self._queue.get_nowait())
+                    except queue.Empty:
+                        break
+            except queue.Empty:
+                # 超时无新日志：如果 batch 中已有积攒的条目，强制 flush
+                if batch:
+                    self._send(batch)
+                    batch = []
+                last_flush = time.monotonic()
+                continue
+
+            # 满了或超时了就发
+            should_flush = (
+                len(batch) >= self._batch_size or
+                (batch and time.monotonic() - last_flush >= self._flush_interval)
+            )
+            if should_flush:
+                self._send(batch)
+                batch = []
+                last_flush = time.monotonic()
+
+        # 退出前 flush 剩余
+        if batch:
+            self._send(batch)
+
+    def _send(self, batch):
+        """通过 pymsg 使用 execute 路由逐条 INSERT 到 dbv2 Logs 表。"""
+        now = datetime.now(timezone.utc).isoformat()
+        try:
+            client = MsgClient(_DBV2_ADDR, _DBV2_PORT, self._service_name + "-log")
+            for entry in batch:
+                extra_val = entry.get("extra")
+                payload = {
+                    "_route": "execute",
+                    "action": "insert",
+                    "table": "Logs",
+                    "values": {
+                        "ts": now,
+                        "service": entry.get("service"),
+                        "level": entry.get("level"),
+                        "message": entry.get("message"),
+                        "trace_id": entry.get("trace_id"),
+                        "extra": json.dumps(extra_val, ensure_ascii=False)
+                        if extra_val is not None else None,
+                    },
+                }
+                resp = client.call(json.dumps(payload), timeout=_TIMEOUT)
+                resp_obj = json.loads(resp)
+                if not resp_obj.get("success"):
+                    import sys
+                    print(f"[log_client] INSERT 失败: {resp_obj.get('error')}",
+                          file=sys.stderr)
+        except Exception as e:
+            import sys
+            print(f"[log_client] 发送失败: {e}", file=sys.stderr)
+
+    def _shutdown(self):
+        """进程退出时 flush 剩余日志。"""
+        self._stop.set()
+        self.flush()
+
+
+# ── 全局单例 ──────────────────────────────────────────────────────────
+#  各服务复制时，把 "example" 改为自己的服务名即可。
+#  例如 dnfs/log_client.py → logs = LogClient(service_name="dnfs")
+#  例如 smtp/log_client.py → logs = LogClient(service_name="smtp")
+
+logs = LogClient()
diff --git a/gateway/inc/DbC.hpp b/gateway/inc/DbC.hpp
index 9261625..7ca99c9 100644
--- a/gateway/inc/DbC.hpp
+++ b/gateway/inc/DbC.hpp
@@ -1,10 +1,13 @@
 #pragma once
 #include <us/HttpClient.hpp>
+#include "Msg.hpp"
 #include <boost/json.hpp>
 namespace qing {
 	namespace json = boost::json;
 	class DbC {
 		public:
+			// 【保留】旧版 HTTP 接口：通过 HttpClient POST 到 dbv2 HTTP /execute 端点。
+			// 保留用于兼容性参考，新代码优先使用 call_msg()（pymsg TCP 协议，更可靠）。
 			static json::value call_http(json::value& params) {
 				
 				auto client = pmc::net::HttpClient();
@@ -16,6 +19,21 @@ namespace qing {
 				});
 				return json::parse(res);
 			}
+
+			// 新版 pymsg 接口：通过 MsgClient（TCP 长度前缀帧协议）调用 dbv2。
+			// 自动添加 _route = "execute"，返回 dbv2 pymsg 完整 JSON 响应
+			//   {"success":..., "data":[...]}。
+			// 响应格式与 call_http 兼容，调用方可直接替换。
+			static json::value call_msg(const json::value& params,
+					double timeout = 5.0) {
+				json::value jv_route = params;
+				jv_route.as_object()["_route"] = "execute";
+				pmc::net::MsgClient client("127.0.0.1", 8005, "gateway");
+				std::string resp = client.call(
+					json::serialize(jv_route), timeout);
+				return json::parse(resp);
+			}
+
 		private:
 			static constexpr const char* _DBURL = "http://127.0.0.1:8005/execute";
 	};
diff --git a/gateway/inc/Msg.hpp b/gateway/inc/Msg.hpp
new file mode 100644
index 0000000..fd7a956
--- /dev/null
+++ b/gateway/inc/Msg.hpp
@@ -0,0 +1,334 @@
+#pragma once
+
+/** pymsg C++ 实现 — Length-prefixed variable-length socket message framing.
+ *
+ * Protocol: [4-byte big-endian uint32_t length][UTF-8 payload]
+ *
+ * 对应 Python 版 pymsg/pymsg/__init__.py，提供：
+ *   - pmsg_send() / pmsg_recv()  底层协议收发函数
+ *   - MsgClient                   短连接 send / call / 长连接 listen 客户端
+ *
+ * Usage:
+ *   #include "Msg.hpp"
+ *
+ *   pmc::net::MsgClient client("127.0.0.1", 8005, "gateway");
+ *   std::string resp = client.call(R"({"sql":"SELECT 1"})", 5.0);
+ *   client.send("hello");
+ */
+
+#include <cerrno>
+#include <cstdint>
+#include <cstring>
+#include <functional>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+// macOS 没有 MSG_NOSIGNAL，用 0 替代（内核不会发 SIGPIPE）
+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
+#endif
+
+namespace pmc {
+namespace net {
+
+// ============================================================================
+// Exceptions
+// ============================================================================
+
+class MsgException : public std::runtime_error {
+public:
+  explicit MsgException(const std::string &msg) : std::runtime_error(msg) {}
+};
+
+class MsgTimeoutException : public MsgException {
+public:
+  explicit MsgTimeoutException(const std::string &msg) : MsgException(msg) {}
+};
+
+class MsgConnectionException : public MsgException {
+public:
+  explicit MsgConnectionException(const std::string &msg) : MsgException(msg) {}
+};
+
+// ============================================================================
+// Low-level protocol: 4-byte big-endian length prefix + UTF-8 payload
+// ============================================================================
+
+namespace detail {
+
+constexpr size_t kHeaderSize = 4;
+
+// ---- 4-byte big-endian 编码 / 解码 ----------------------------------------
+
+inline void writeUint32BE(char *buf, uint32_t val) noexcept {
+  buf[0] = static_cast<char>((val >> 24) & 0xFFu);
+  buf[1] = static_cast<char>((val >> 16) & 0xFFu);
+  buf[2] = static_cast<char>((val >> 8) & 0xFFu);
+  buf[3] = static_cast<char>(val & 0xFFu);
+}
+
+inline uint32_t readUint32BE(const char *buf) noexcept {
+  return (static_cast<uint32_t>(static_cast<unsigned char>(buf[0])) << 24) |
+         (static_cast<uint32_t>(static_cast<unsigned char>(buf[1])) << 16) |
+         (static_cast<uint32_t>(static_cast<unsigned char>(buf[2])) << 8) |
+         (static_cast<uint32_t>(static_cast<unsigned char>(buf[3])));
+}
+
+// ---- socket 超时设置 ------------------------------------------------------
+
+inline void setSockTimeout(int sockfd, double seconds) {
+  struct timeval tv {};
+  tv.tv_sec = static_cast<time_t>(seconds);
+  tv.tv_usec =
+      static_cast<long>((seconds - static_cast<double>(tv.tv_sec)) * 1'000'000.0);
+  ::setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
+  ::setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
+}
+
+// ---- 精确读取 n 字节 ------------------------------------------------------
+
+inline void recvExact(int sockfd, char *buf, size_t n) {
+  size_t received = 0;
+  while (received < n) {
+    ssize_t r = ::recv(sockfd, buf + received, n - received, 0);
+    if (r == 0) {
+      throw MsgConnectionException(
+          "connection closed: expected " + std::to_string(n) +
+          " bytes, got " + std::to_string(received));
+    }
+    if (r < 0) {
+      if (errno == EAGAIN || errno == EWOULDBLOCK) {
+        throw MsgTimeoutException("recv timed out");
+      }
+      throw MsgConnectionException(
+          "recv error: " + std::string(::strerror(errno)));
+    }
+    received += static_cast<size_t>(r);
+  }
+}
+
+// ---- 完整发送 -------------------------------------------------------------
+
+inline void sendAll(int sockfd, const char *data, size_t len) {
+  size_t sent = 0;
+  while (sent < len) {
+    ssize_t w =
+        ::send(sockfd, data + sent, len - sent, MSG_NOSIGNAL);
+    if (w < 0) {
+      if (errno == EAGAIN || errno == EWOULDBLOCK) {
+        throw MsgTimeoutException("send timed out");
+      }
+      throw MsgConnectionException(
+          "send error: " + std::string(::strerror(errno)));
+    }
+    sent += static_cast<size_t>(w);
+  }
+}
+
+// ---- 短连接 helper：connect → action → close ------------------------------
+
+inline int openConnection(const std::string& addr, int port, double timeout) {
+  int fd = ::socket(AF_INET, SOCK_STREAM, 0);
+  if (fd < 0) {
+    throw MsgConnectionException(
+        "socket() failed: " + std::string(::strerror(errno)));
+  }
+
+  struct sockaddr_in serv_addr {};
+  serv_addr.sin_family = AF_INET;
+  serv_addr.sin_port = htons(static_cast<uint16_t>(port));
+  if (::inet_pton(AF_INET, addr.c_str(), &serv_addr.sin_addr) <= 0) {
+    ::close(fd);
+    throw MsgConnectionException("invalid address: " + addr);
+  }
+
+  setSockTimeout(fd, timeout);
+
+  if (::connect(fd, reinterpret_cast<struct sockaddr *>(&serv_addr),
+                sizeof(serv_addr)) < 0) {
+    ::close(fd);
+    throw MsgConnectionException(
+        "could not connect to " + addr + ":" + std::to_string(port) +
+        " - " + ::strerror(errno));
+  }
+
+  return fd;
+}
+
+} // namespace detail
+
+// ============================================================================
+// 底层协议函数：pmsg_send / pmsg_recv
+// ============================================================================
+
+/// 以 pymsg 协议发送一条字符串消息（长度前缀 + UTF-8 载荷）。
+inline void pmsg_send(int sockfd, const std::string &data) {
+  size_t payload_size = data.size();
+  if (payload_size > 0xFFFFFFFFu) {
+    throw MsgException("payload too large: " + std::to_string(payload_size));
+  }
+  char header[detail::kHeaderSize];
+  detail::writeUint32BE(header, static_cast<uint32_t>(payload_size));
+  detail::sendAll(sockfd, header, detail::kHeaderSize);
+  detail::sendAll(sockfd, data.c_str(), payload_size);
+}
+
+/// 以 pymsg 协议接收一条字符串消息。
+/// @throws MsgConnectionException  连接在收全消息前断开。
+/// @throws MsgTimeoutException     等待超时。
+inline std::string pmsg_recv(int sockfd) {
+  char header[detail::kHeaderSize];
+  detail::recvExact(sockfd, header, detail::kHeaderSize);
+  uint32_t length = detail::readUint32BE(header);
+  if (length > 64 * 1024 * 1024) { // 安全上限 64 MiB
+    throw MsgException("message too large: " + std::to_string(length));
+  }
+  std::string payload(static_cast<size_t>(length), '\0');
+  detail::recvExact(sockfd, payload.data(), length);
+  return payload;
+}
+
+// ============================================================================
+// MsgClient
+// ============================================================================
+
+/// 基于 pymsg 协议的 TCP 客户端。
+///
+/// 支持三种操作模式：
+///   - send()    短连接发送一条消息（不等待回复），消息带 name 前缀。
+///   - call()    短连接发送 + 阻塞等待回复（RPC 模式），原始消息不添加前缀。
+///   - listen()  基于 connect() 维持的长连接，持续接收消息并回调。
+class MsgClient {
+public:
+  MsgClient(const std::string &addr, int port, const std::string &name)
+      : _addr(addr), _port(port), _name(name), _sockfd(-1), _running(false) {}
+
+  ~MsgClient() { stop(); }
+
+  // ---- 连接 ---------------------------------------------------------------
+
+  /// 创建 TCP 套接字并连接到服务器（长连接，供 listen() 使用）。
+  void connect() {
+    _sockfd = detail::openConnection(_addr, _port, /*timeout=*/10.0);
+  }
+
+  // ---- 发送单条消息（短连接，带名字前缀）----------------------------------
+
+  /// 短连接发送一条消息到服务器，消息格式为 ``"name: msg"``。
+  /// 不等待回复。短连接（每次创建新 socket，发完即关）。
+  void send(const std::string &msg) {
+    int fd = detail::openConnection(_addr, _port, /*timeout=*/3.0);
+    try {
+      pmsg_send(fd, _name + ": " + msg);
+      ::close(fd);
+    } catch (...) {
+      ::close(fd);
+      throw;
+    }
+  }
+
+  // ---- 请求-应答（短连接，RPC 模式）---------------------------------------
+
+  /// 短连接发送一条消息，阻塞等待并返回一条回复。
+  ///
+  /// 不会给消息添加 ``name:`` 前缀（适用于 RPC/API 调用）。
+  ///
+  /// @param msg      要发送的原始字符串。
+  /// @param timeout  超时秒数，默认 10.0。
+  /// @returns        服务器返回的字符串。
+  std::string call(const std::string &msg, double timeout = 10.0) {
+    int fd = detail::openConnection(_addr, _port, timeout);
+    try {
+      pmsg_send(fd, msg);
+      std::string resp = pmsg_recv(fd);
+      ::close(fd);
+      return resp;
+    } catch (...) {
+      ::close(fd);
+      throw;
+    }
+  }
+
+  // ---- 持续监听（长连接，阻塞回调模式）-----------------------------------
+
+  /// 在长连接上持续接收消息并通过回调处理。
+  ///
+  /// 阻塞当前线程直到 stop() 被调用或连接断开。
+  /// 必须先调用 connect()。
+  ///
+  /// @param on_message  回调 ``void(const std::string &msg)``。
+  void listen(std::function<void(const std::string &)> on_message) {
+    if (_sockfd < 0) {
+      throw MsgException("must call connect() before listen()");
+    }
+
+    _running = true;
+    while (_running) {
+      fd_set readfds;
+      FD_ZERO(&readfds);
+      FD_SET(_sockfd, &readfds);
+
+      struct timeval tv {};
+      tv.tv_sec = 0;
+      tv.tv_usec = 100'000; // 100 ms 轮询间隔
+
+      int ready =
+          ::select(_sockfd + 1, &readfds, nullptr, nullptr, &tv);
+      if (ready < 0) {
+        if (errno == EINTR) continue;
+        break; // EBADF or other fatal error
+      }
+      if (ready == 0) continue; // timeout, loop around
+
+      try {
+        std::string text = pmsg_recv(_sockfd);
+        on_message(std::move(text));
+      } catch (const MsgConnectionException &) {
+        break; // 连接断开，退出循环
+      } catch (const MsgTimeoutException &) {
+        continue; // 读超时但连接仍在，继续等待
+      }
+    }
+
+    if (_sockfd >= 0) {
+      ::close(_sockfd);
+      _sockfd = -1;
+    }
+  }
+
+  // ---- 停止 ---------------------------------------------------------------
+
+  /// 设置停止标志并关闭套接字。可从任意线程调用。
+  void stop() noexcept {
+    _running = false;
+    if (_sockfd >= 0) {
+      ::close(_sockfd);
+      _sockfd = -1;
+    }
+  }
+
+  // ---- 访问器 -------------------------------------------------------------
+
+  const std::string &addr() const noexcept { return _addr; }
+  int port() const noexcept { return _port; }
+  const std::string &name() const noexcept { return _name; }
+
+private:
+  std::string _addr;
+  int _port;
+  std::string _name;
+  int _sockfd;
+  bool _running;
+};
+
+} // namespace net
+} // namespace pmc
diff --git a/gateway/src/main.cpp b/gateway/src/main.cpp
index bd9218a..fec25f1 100644
--- a/gateway/src/main.cpp
+++ b/gateway/src/main.cpp
@@ -700,7 +700,9 @@ http::response<http::string_body> handleLogin(
 		//	stored_hash = std::string(reinterpret_cast<const char*>(stmt.read_text(0)));
 		//}
 
-		// 新版调用db模块
+		// 新版调用db模块（通过 MsgClient pymsg TCP 协议）
+		// 【保留】旧版 HTTP 调用方式：
+		//   auto jv_db_r = DbC::call_http(jv_select);
 		json::value jv_select = {
 			{"action", "select"},
 			{"table", "Users"},
@@ -708,7 +710,7 @@ http::response<http::string_body> handleLogin(
 				{"username", username},
 			}}
 		};
-		auto jv_db_r = DbC::call_http(jv_select);
+		auto jv_db_r = DbC::call_msg(jv_select);
 		auto obj_r = jv_db_r.as_object();
 		auto success = obj_r["success"].as_bool();
 		if (!success) THROW_EX_CUSTOM(HttpException, 2102, "Login (Update Step) Failed", 500, "/login");
@@ -853,7 +855,9 @@ http::response<http::string_body> handleRegister(
 	//stmt.bind_text(2, password_hash);
 	//stmt.step();
 	//
-	// 新版调用db模块
+	// 新版调用db模块（通过 MsgClient pymsg TCP 协议）
+	// 【保留】旧版 HTTP 调用方式：
+	//   auto jv_result = DbC::call_http(jv_insert);
 	json::value jv_insert = {
 		{"action", "insert"},
 		{"table", "Users"},
@@ -862,7 +866,7 @@ http::response<http::string_body> handleRegister(
 			{"password_hash", password_hash}
 		}}
 	};
-	auto jv_result = DbC::call_http(jv_insert);
+	auto jv_result = DbC::call_msg(jv_insert);
 	auto obj_r = jv_result.as_object();
 	auto success = obj_r["success"].as_bool();
 	if (!success) THROW_EX_CUSTOM(HttpException, 2202, "Registe Failed", 400, "/register");