-- Add experiment-level shelling parameters (defaults for repetitions)
-- These match the shelling table attributes: ring_gap_inches, drum_rpm

ALTER TABLE public.experiments
ADD COLUMN IF NOT EXISTS ring_gap_inches NUMERIC(6,2) CHECK (ring_gap_inches IS NULL OR ring_gap_inches > 0),
ADD COLUMN IF NOT EXISTS drum_rpm INTEGER CHECK (drum_rpm IS NULL OR drum_rpm > 0);

COMMENT ON COLUMN public.experiments.ring_gap_inches IS 'Default space (inches) between sheller rings for this experiment';
COMMENT ON COLUMN public.experiments.drum_rpm IS 'Default sheller drum revolutions per minute for this experiment';