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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.
On the other hand, if you really want a budget FPGA board under 100 USD that can implement a Linux-capable RISC-V SoC, you will need to implement a simple 32-bit one but indeed possible. See https://github.com/litex-hub/linux-on-litex-vexriscv for instance. You will get additional frequencies (still an order of 100 MHz though), I/O ports and such if you can spend 200 to 300 USD.
NOTE:
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