fix: 优化 MySQL 重试机制，增加可重试错误类型并改进日志记录

DB.py

@@ -92,34 +92,44 @@ video_author = Table(
 )
 
 
-def mysql_retry(max_retries: int = 3, base_delay: float = 2.0):
-    """
-    装饰器：捕获断线异常（InterfaceError 或 OperationalError: 2013）后尝试重连，指数回退重试。
-    """
+def mysql_retry(max_retries: int = 3, base_delay: float = 1.0):
+    RETRIABLE_ERRORS = {2013, 1213, 2006}
 
     def decorator(fn):
         @functools.wraps(fn)
         def wrapper(self, *args, **kwargs):
             for attempt in range(1, max_retries + 1):
                 try:
+                    # 确保连接仍存活，失败自动 reconnect
                     self.conn.ping(reconnect=True)
                     return fn(self, *args, **kwargs)
-                except (pymysql.InterfaceError, pymysql.OperationalError) as e:
-                    if isinstance(e, pymysql.OperationalError) and e.args[0] != 2013:
-                        raise  # 只处理 2013，其他 OperationalError 抛出
-                    wait = base_delay * (2 ** (attempt - 1))
-                    logger.warning(f"[MySQL][{fn.__name__}] 第{attempt}次重试（断开连接：{e}），等待 {wait:.1f}s 后重连…")
-                    time.sleep(wait)
-                    self._reconnect_mysql()
-                    if attempt == max_retries:
-                        logger.error("[MySQL] 重试多次仍失败，抛出异常")
+
+                except pymysql.OperationalError as e:
+                    errno = e.args[0]
+                    if errno not in RETRIABLE_ERRORS:
                         raise
 
+                    reason = {
+                        2013: "连接断开",
+                        1213: "死锁冲突",
+                        2006: "连接失效",
+                    }.get(errno, f"MySQL错误{errno}")
+
+                    wait = base_delay * (2 ** (attempt - 1))
+                    logger.warning(f"[MySQL][{fn.__name__}] 第{attempt}次重试（{errno} {reason}）：{e}，等待 {wait:.1f}s...")
+
+                    # 仅对断连类错误尝试重连
+                    if errno in {2013, 2006}:
+                        self._reconnect_mysql()
+
+                    time.sleep(wait)
+
+            logger.error(f"[MySQL] 函数 `{fn.__name__}` 重试 {max_retries} 次仍失败，最终异常：{e}")
+            raise
+
         return wrapper
-
     return decorator
 
-
 def redis_retry(max_retries: int = 3):
     """
     装饰器工厂：指定最大重试次数。