-- Fixed slot count: NULL = unlimited list; 1 for single; N for a row of N uploaders

ALTER TABLE website_image_slots
  ADD COLUMN IF NOT EXISTS item_count INTEGER;

ALTER TABLE website_image_slots
  DROP CONSTRAINT IF EXISTS website_image_slots_item_count_check;

ALTER TABLE website_image_slots
  ADD CONSTRAINT website_image_slots_item_count_check
  CHECK (item_count IS NULL OR item_count >= 1);

UPDATE website_image_slots
SET item_count = 1
WHERE kind = 'single' AND item_count IS NULL;

UPDATE website_image_slots
SET item_count = 2
WHERE slot_key = 'two-banner-row' AND kind = 'list';