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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 put it on a $5-10 server on linode and upgrade to $20 server if you need to anytime. For an extra $5 it'll include daily backups, and one on demand backup. Last time I had to set it up it took me about an hour to get it running with a LEMP (Nginx, mariadb as a drop in replacement of mysql) stack from https://wordops.net/. But if you want it to stay htaccess compatible that a majority of wordpress plugins expect, should run with a litespeed stack.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.