db=# select * from only item;
 id | name | active | pid | isgroup
----+------+--------+-----+---------
(0 rows)

db=# select * from item_act;
  id  |  name   | active | pid | isgroup
------+---------+--------+-----+---------
 0101 | Товар 1 | t      |     | f
 0102 | Товар 2 | t      |     | f
(2 rows)

db=# select * from item_arch;
 id | name | active | pid | isgroup
----+------+--------+-----+---------
(0 rows)

db=# select * from item;
  id  |  name   | active | pid | isgroup
------+---------+--------+-----+---------
 0101 | Товар 1 | t      |     | f
 0102 | Товар 2 | t      |     | f
(2 rows)

CREATE TABLE "public"."table1" (
  "item" TEXT, 
  CONSTRAINT "table1_fk" FOREIGN KEY ("item")
    REFERENCES "public"."item"("id")
    ON DELETE CASCADE
    ON UPDATE CASCADE
    NOT DEFERRABLE
) WITHOUT OIDS;

db=# insert into table1(item) values('0101');
ERROR:  insert or update on table "table1" violates foreign key constraint "table1_fk"
DETAIL:  Key (item)=(0101) is not present in table "item".