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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.
I don't want to discourage you, the project could be a lot of fun and you could learn a lot. But I do want to caution you that such a project would be pretty complex so there's a chance that when you're doing your initial design you'll decide it's to intensive as a solo project. You may want to check out https://www.investopedia.com/simulator/ which does this already.
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.