Design changes
Every site in the showcase is checked daily. We read the CSS it actually serves, reduce it to its design tokens, and record a new entry only when something genuinely changes. Not a screenshot of a page, and not a guess: the declared values, dated.
The snapshot tables are not there yet. Create them with db/design-snapshots.sql, then
the daily job begins recording. Nothing is lost by starting later, except the history between now and
then, which cannot be recovered.