The rel attribute has been captured on every backlink since that
table was added, but never displayed — a dofollow vs. nofollow
backlink is a real difference for SEO/competitive analysis, not just
a link count. Links with none of those tokens show as "dofollow".
Verified against real data (existing noopener-only link renders as
dofollow) plus a temporary synthetic nofollow+sponsored row to
confirm that branch too, removed after confirming.
m105
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