Those tests are sometimes failing on CI and we have two hypothesis: 1. Something wrong with consistency of statements 2. Interruption from another test run (e.g. same queries performed concurrently or data remained after previous run) To exclude or confirm 2. we add random marker to avoid potential collision, in such case it will be clearly visible that wrong data comes from a different run. Related scylladb/scylladb#18931 Related scylladb/scylladb#18319