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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.
If you have any experience with modern web development, this could actually be a great opportunity. I'm in a similar situation with an application that is extremely old and running on Web Forms (and in VB.NET, god I hate that language). Pretty much every developer on my team has no idea how to build a modern web site, so I get to run pretty much everything related to modernization. It's great experience for the resume. I would recommend using DotVVM (https://www.dotvvm.com) for a rewrite. It's not very popular yet, but it lets you iteratively migrate web forms apps to a .NET Core compliant application. From there, you could rewrite even further into something like React.