BEGIN;
CREATE TABLE article_images (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    article_id UUID NOT NULL REFERENCES articles(id),
    image_path TEXT NOT NULL CHECK (length(trim(image_path)) > 0),
    visible BOOLEAN NOT NULL DEFAULT TRUE,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(article_id, image_path)
);

COMMIT;