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Redis
Redis is an in-memory database that persists on disk. The data model is key-value, but many different kind of values are supported: Strings, Lists, Sets, Sorted Sets, Hashes, Streams, HyperLogLogs, Bitmaps.
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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.
Personally here is how i have always done it, first the images are stored in a folder, second I create a .properties file specifying the image versions. Then when the user opens the application I make an http request call and get the images with the image version that is specified in the properties file. Then I cache the images using https://github.com/Nodonisko/ionic-cache.
Probably https://redis.io/