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Hello!
It is normal to have buffers/cache consume a lot of memory on Linux systems. That's expected behavior. Such memory is being used to speed up your system, and the space used by buffers/cache is automatically freed when the system needs more memory for something else. Thus, I don't understand why would you want to manually force the system to drop its cached data.
Also, KOReader has a built-in RSS feed that works pretty much in a similar way to the tool you wrote. It can fetch the last "n" articles of each feed, and download them and save them as EPUBs locally. (I've used that on an old Kindle device, I'm assuming this feature is also available on KOReader for Kobo.)
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