perf(traces): add trace_facets_hourly rollup for the sidebar facets - #1112

Confidence 4/5 · likely safe to merge
The only change since the last review is the v23→v24 local step, and its SQL matches the v24 MV body and column list exactly.
_{quality 100/100 · no findings · tests covered · risk medium}

The remaining change is the v23→v24 local step: it truncates the new rollup and backfills it from trace_list_mv before the resumed step can re-run. Its SQL matches the v24 schema group for group; nothing else moved.

• local-0023-to-0024-trace-facets-hourly backfills trace_facets_hourly from trace_list_mv

_{f4a2d5c · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple to ask about one.}