-- Non-destructive photo editing: the parameters live in the photo metadata and
-- the edited image is stored as separate objects next to the base variants.

ALTER TABLE photos ADD COLUMN IF NOT EXISTS edit_params jsonb NOT NULL DEFAULT '{}'::jsonb;

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',
                    'edit', 'edit_thumb', 'edit_medium', 'edit_preview'));

-- Durable queue of pending edit renders, one job per photo.
CREATE TABLE IF NOT EXISTS edit_jobs (
    photo_id        text PRIMARY KEY REFERENCES photos(id) ON DELETE CASCADE,
    attempts        integer NOT NULL DEFAULT 0,
    next_attempt_at timestamptz NOT NULL DEFAULT now(),
    last_error      text NOT NULL DEFAULT '',
    created_at      timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS edit_jobs_due_idx ON edit_jobs (next_attempt_at);