在Django中，如何防止在AppConfig.ready()中导入的信号多次运行？

from django.apps import AppConfig
from django.dispatch import receiver
from django.db.models.signals import post_save

class YourAppConfig(AppConfig):
    name = 'your_app'

    def ready(self):
        from your_app.signals import your_signal_handler

        # 使用@receiver装饰器注册信号接收器
        @receiver(post_save, sender=YourModel, dispatch_uid="your_unique_identifier")
        def your_receiver(sender, **kwargs):
            # 信号处理逻辑
            your_signal_handler()