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payload
The best way to build a modern backend + admin UI. No black magic, all TypeScript, and fully open-source, Payload is both an app framework and a headless CMS.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
For hosting the backend, I'd recommend fly.io if you need a good free service. You'll probably need to host your Postgres DB in AWS or Google Cloud.
Check out Payload if you haven't seen it. We built Quikplow which is a native app (basically Uber for snow plows) and used Payload for auth, access control, file storage, Stripe Connect integration, etc. Saved a lot of time and we built the MVP in 3 months start to finish. Might be a good fit for your project.