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Akavache
An asynchronous, persistent key-value store created for writing desktop and mobile applications, based on SQLite3. Akavache is great for both storing important data as well as cached local data that expires.
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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 its caching you could just use ready made packages - https://github.com/jamesmontemagno/monkey-cache - https://github.com/reactiveui/akavache/
If its caching you could just use ready made packages - https://github.com/jamesmontemagno/monkey-cache - https://github.com/reactiveui/akavache/
For pure key-value storage .net has IDistributedCache abstraction, with SQLite implementation. (This has no dependencies on asp.net core and can be used in any .net app)