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vectordata_demo.yaml needs no database — the stdout driver exercises dataset access alone. It prints what it derived from the dataset, fetches a record range with the meter running, and reads records back, so a download can be watched from one command line. prefetch=false with mode=background moves the fetch off the load path and overlaps it with the cycles instead. Binding meter labels now carry the profile, matching the expr form, so both name the same thing in a run that uses both.