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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.
Although overall, I think JS/TypeScript is a better time investment. Any language can be used on a backend. But not only does JS add frontend to your potential usages, but you can even build desktop (electron) + mobile apps (react native) too. You can even compile you JS/Node programs to a binary: https://github.com/vercel/pkg
NOTE:
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Hence, a higher number means a more popular project.