The ... ROAMING folder is your USER Settings and plugins.
The Library folder (the one with metadata.db ) is data and settings and Books for THAT LIBRARY ONLY (some of us have more than one. They can have different settings)
A fresh Calibre install (no previous remnants) recreates a generic structure.
Note the ford 'fresh'. If Calibre installer finds those files IT LEAVES THEM ALONE (and just updates the program)
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