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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 check if you can get a good start with the open-source toolchain with this tutorial: https://github.com/icebreaker-fpga/icebreaker-workshop (PDF: https://raw.githubusercontent.com/icebreaker-fpga/icebreaker-workshop/master/stopwatch/icebreaker-fpga-stopwatch-workshop.pdf )
If you really want a PCIe FPGA, I would suggest $110 PCIe FPGA Artix 100T, LiteFury (amazon), Repo (Github), or the SQRL Acorn version for Artix 200T goes for $60-100 on eBay, just search sqrl acorn cle-215+
NOTE:
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Hence, a higher number means a more popular project.