One top-level category (by slug, default `ecommerce`) with every level-2 and level-3 category under it and the public brands and active ads filed under each, in one read. A category with no public brand is left out. The same totals as categories.list.

One top-level category (by slug, default ecommerce) with every level-2 and level-3 category under it and the public brands and active ads filed under each, in one read. A category with no public brand is left out. The same totals as categories.list. Scope categories:read; cache daily.