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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.
You can do better, the NanoPi R4S is $50 for the 1gb model and $70 for the 4gb. It was designed for OpenWRT (more specifically, FriendlyWRT). It's about as good as the RPI4. There's no limit to onboard storage because it uses micro-sd. For most people, myself included, 1gb of ram is more than enough. already has a few unofficial builds and an official one is around the corner. You can follow the discussion right here. The best unofficial build is right here. As you can see, it's a work in progress and it's moving along very quickly.
NOTE:
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Hence, a higher number means a more popular project.