CREATE TABLE IF NOT EXISTS modelle (
    id UUID PRIMARY KEY,
    modellname VARCHAR NOT NULL,
    typ_id UUID,
    hersteller_id UUID,

    CONSTRAINT fk_typ FOREIGN KEY (typ_id)
    REFERENCES typen (id)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,

    CONSTRAINT fk_hersteller FOREIGN KEY (hersteller_id)
    REFERENCES hersteller (id)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION
)