we need to combine all purge-related articles in one FAQ so we can simply send one link to users, when they face the issue.
here is an example reply
Most probably your runs were automatically purged (here is a dedicated documentation https://docs.testomat.io/management/project/settings/#purge-old-runs). More explanation here https://docs.testomat.io/project/runs/managing-runs/#compress-and-move-to-archive-purge.
You can try finding runs in Archive https://docs.testomat.io/project/runs/archive-runs-and-groups/#how-to-unarchive-runs--rungroups