[Fixed]-Celery restart loss scheduled tasks

you have to use RabbitMq instead redis.

RabbitMQ is feature-complete, stable, durable and easy to install. It’s an excellent choice for a production environment.

Redis is also feature-complete, but is more susceptible to data loss in the event of abrupt termination or power failures.

Using rabbit mq your problem of lossing message on restart have to gone.