-- Video support: media kind and duration on photos, a playback object role, and
-- a job kind distinguishing short image work from long transcoding work.

ALTER TABLE photos ADD COLUMN IF NOT EXISTS kind text NOT NULL DEFAULT 'image'
    CHECK (kind IN ('image', 'video'));
ALTER TABLE photos ADD COLUMN IF NOT EXISTS duration_ms bigint;

ALTER TABLE photo_objects DROP CONSTRAINT IF EXISTS photo_objects_role_check;
ALTER TABLE photo_objects ADD CONSTRAINT photo_objects_role_check
    CHECK (role IN ('original', 'thumb', 'medium', 'preview', 'playback'));

ALTER TABLE variant_jobs ADD COLUMN IF NOT EXISTS kind text NOT NULL DEFAULT 'image'
    CHECK (kind IN ('image', 'video'));