diff --git a/scripts/price_monitor.py b/scripts/price_monitor.py
index 046a24c9..d96981d5 100644
--- a/scripts/price_monitor.py
+++ b/scripts/price_monitor.py
@@ -388,6 +388,7 @@ def get_trigger_zones(trigger):
 def run_once(round_label=""):
     """执行一轮完整的监控流程"""
     import os  # 必须在开头import，否则os变量会被后面的局部import绑定覆盖
+    os.nice(10)  # 降低优先级，避免与DB其他写操作抢占
     # ── 进程锁：同一时间只跑一个实例 ──
     _lk = "/tmp/price_monitor.lock"
     _pid = None