The pipeline's LIVE plots — what its deployments are currently drawing, one per (twin, plot step). Overwritten on every triggered run, so there is exactly one current figure per plot and no history to page through. Without twin/script/dataframe this LISTS them; with all three it returns one, as the stored figure or as its series. Driven by the pipeline definition at each deployment's release crossed with that deployment's twins, so a renamed or removed plot step disappears instead of showing as a months-old "current" plot. Experiment plots are elsewhere and unchanged: they are one blob per execution, addressed by uuid at GET /plots//.