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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.
Nextzen has freely available DEM tile data to zoom level 15, so about 5 meters/pixel. You need a free API key [1]
Mapbox has paid DEM data to zoom level 20, but I think it's just zoom level 15 scaled up (but the data is cleaner and more recent) [2]
Nextzen also open-sourced their elevation tile generator, but I haven't tried to generate my own tiles [3]
[1] https://www.nextzen.org/#terrain-tiles
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