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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.
these are pretty high res already. Using Saucenao I found a higher res for the first one but the second one is actually a cleaned up version of one of the volumes' index page and [this is highest res I could find of it](blob:https://mangadex.org/2e2b22b5-0219-44d5-b573-5f91ca800b15), but you would have the clean out the text yourself in Photoshop. Alternatively you could use sites that enlarge images like waifu2x on the one you already have instead of trying to photoshop it.
If you have a PC, you can download a wrapper for waifu2x like this one that lets you upscale without having to rely on a website.