These are dumps of maintainer and repository events (these which
form corresponding feeds, for instance [1] and [2]) are dumped here
and removed from the main database to speed things up and free some
space. Not sure if we'll ever need these, but I'll let these be as
long as there's no diskspace shortage.

[1] https://repology.org/maintainer/amdmi3%40freebsd.org/feed-for-repo/freebsd
[2] https://repology.org/repository/freebsd/feed