I have a problem when upgrading the ojs version 2.4.8-5 to 3.2.1-4, this is the problem;
I start the upgrade again with the new database from my backup.
and solve the problem by using this query :
CREATE TABLE review_rounds_old SELECT * FROM review_rounds;
DELETE FROM review_rounds WHERE review_round_id NOT IN (SELECT MIN(review_round_id) FROM review_rounds_old GROUP BY submission_id, round);
DROP TABLE review_rounds_old;
but I got a new error like this;
this is like data duplication which is not allowed in the new version, when I upgraded from an older version to 2.4.8-5 it was fine, but when I upgraded to version 3.2.1-4 I encountered the above problem. I also had the same problem when upgrading to the 3.0.0 version.