CREATE TABLE IF NOT EXISTS public.thumbnail_version (
  id_user integer NOT NULL,
  id_unit integer NOT NULL,
  version bigint NOT NULL,
  sm_size_hash text NOT NULL DEFAULT '',
  PRIMARY KEY (id_unit)
);
ALTER TABLE
  public.thumbnail_version
ADD
  CONSTRAINT composite_unit_fk FOREIGN KEY (id_unit, id_user) REFERENCES unit (id, id_user) MATCH FULL ON DELETE CASCADE ON UPDATE CASCADE;