Every other endpoint here is a reading of one TibiaWiki dump, and this
says which one: the tibiawiki-sql release that generated it, when it was
generated and when it was imported. The dump is replaced by hand every few
months, so this is the endpoint to ask whether anything has moved — cache
on dump.generated_at and re-read the rest when it changes. Not on
dump.version: that names the release of the tool, and the next dump it
builds carries the same one. dump is null until the first import has
finished.