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ASP.NET Core
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
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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.
It's fairly simple to add an OAuth provider if you need to. Microsoft provides support out of the box for four (Microsoft, Google, Twitter, Facebook), and provide a nice guide. Aside from this, you can implement your own integration or use a prebuilt integration this repo has a really nice selection. The buttons to authenticate with the provider(s) will appear on the login page automatically.
ASP .NET Core Identity allows user storage providers to be swapped out, so that you can store your users anywhere. The bootstraped app is setup to use a local database on disk. It's fairly easy to swap over to a proper MS SQL server using Entity Framework by changing the connection string in the configuration file, however for anything else, you'll need to fall back on community maintained user stores or write your own. Microsoft does have a handy list of these storage providers though and a couple of decent pieces of documentation.