tt-rss/schema/versions/pgsql/41.sql

alter table ttrss_feed_categories add column order_id int;
update ttrss_feed_categories set order_id = 0;
alter table ttrss_feed_categories alter column order_id set not null;
alter table ttrss_feed_categories alter column order_id set default 0;

update ttrss_version set schema_version = 41;