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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.
Another option would be something like Google's Firebase which would solve both hosting your app and providing you with a database. I would personally start a project like this with Firebase. Fireship has a great beginner guide on Firebase if you go this route. With Firebase, you would still need to pick a frontend. You could use React or any other frontend framework.
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