How to make a circuit fireproof

I am not sure if this question belongs here, so please dont downvote and instead suggest which place should I migrate it. I have read up on how to ask help and I think my question does fall under these categories:

computer hardware, computer software, or personal and home computer networking

So coming to the question, in our place we have sub zero temperatures and in winters we keep a firepot made up of clay to keep us warm, charcoal is filled into this clay pot and ignited, the span for heating is around 4-5 hours (More information about the equipment). This is the most widely used equipment because the population is not so well to do so as to purchase costly heating equipment.

However one pitfall to this approach is that in winters people tend to use this firepot while sleeping and at times taking it with them under the quilt. Unfortunately when a person falls asleep, sometimes the firepot trips and in the moing we have charred bodies or bued homes.

I am planning to make an IOT device capable of detecting the trip and fire an alarm, however I am stuck on how to make this circuitry fire / heat proof and prevent it from melting. Please suggest.

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