(Ed wrote)
These are produced by the "tracker" packages. I, personally, couldn't find a need for them so I erased them quite some time ago.
I assume you deleted the files, not the packages. Mine were dated 2013, so I deleted them.
Do a "dnf info tracker" and "dnf info traker-miners" for more info on what they do.
That gave me a rough idea. Doesn't sound like anything I have wanted or do want. But I can't predict the future, so I'm keeping the packages.
Thank-you, Ed. Bill.