Variants, rework and exact cases

Use the shared contract and filters/units. Choose the branch answering the question; do not run a variant overview before an exact-case or rework request.

Ordered traces

Common or slow variants

1. get_variants_with_metrics_v2 {S,filterOptions:F,itemsPerPage:5,itemsToSkip:0,metricToSortBy:"CaseCount",sortOrder:"Descending"}.
2. Only if mean-case slowness still needs comparison, repeat with metricToSortBy:"CaseDuration". If the first complete result already answers it, stop. CaseDuration is a mean; variant Duration is not its substitute.

Cases with repeated work