ALTER TABLE AKUZ.T_VACCINATION_IMMUNITY RENAME COLUMN "titrantitel" TO "titrantitelold";

ALTER TABLE AKUZ.T_VACCINATION_IMMUNITY ADD "titrantitel" integer NULL;

update AKUZ.T_VACCINATION_IMMUNITY
set "titrantitel" = cast(substring("titrantitelold"::text from 3 for 3) as integer);

ALTER TABLE AKUZ.T_VACCINATION_IMMUNITY DROP COLUMN "titrantitelold";