-- Images only runners hold (oxygenflow#94, oxygenhub#342): a runner sends the

-- manifest of an image it holds that the hub keeps none of, and the swarm

-- moves the chunks between runners. `source` is 'hub' for an image pushed

-- here and verified whole, 'peer' for one only runners hold; `holder` names

-- the runner that sent a peer manifest.

ALTER TABLE jet_images ADD COLUMN source TEXT NOT NULL DEFAULT 'hub';

ALTER TABLE jet_images ADD COLUMN holder TEXT NOT NULL DEFAULT '';