Per-domain crawler rollup, most expensive first.

THE ROW SET is every domain the crawler has touched or is expected to: any domain with run history (ever) UNION any domain whose desk reads/writes the index. The union matters in both directions — a desk flipped onto the internal lane but not yet crawled belongs on this page with zeros (it is pending, and that is actionable), and a domain crawled under the pre-warm allowlist while still on "exa" belongs on it too (it is costing money). Domains with neither are not the crawler's business and would be pages of zeros.

Sorted by windowed cost descending, then by run count, then host — so the table opens on whatever is spending the most, and ties don't reorder between reloads.

Always 200s; an empty fleet is a well-formed empty list.