Seeing how it hasn't survived the HN hug of death... Not sure how you've built it but consider putting it behind a CDN or something and caching the responses, esp since you're trying to pull live data
Webapp is light enough to handle 10000 concurrent hits.
Cloudflare with Cache-Control headers is even simpler if you're okay with adding Cloudflare as a dependency.
From an ASN lookup, it appears you're hosting on Oracle Cloud, so Cloudflare would also give you free data egress: https://blogs.oracle.com/cloud-infrastructure/why-cdn-client...
Their Always-On feature would also help if Oracle has an outage.
I like the general idea, very lightweight and more likely to remain accessible when an emergency is overloading the mobile networks.