fixing SQL migration scripts

Hello cz.nic Team When testing SQL upgrade script I got the following error: 2.21.5-2.21.6.sql Failed (check /tmp/aaa) psql:2.21.5-2.21.6.sql:1295: ERROR: null value in column "zone_id" violates not-null constraint I took a look and it seems that the script is prepared for your registry only (unless there's someone else also running .cz ;-)) Could you please tell me if the following patch is correct? It seems to do the job IMHO. Best regards Piotr