we use Tiki as an intranet portal in our company. For several reasons we didn't upgrade Tiki. Now we would like to upgrade Tiki to the last LTS version.
We have perfomed some changes in the code and have a theme.
My problem are the changes we have done on the database. Some tables are new and in other tables some columns were added.
How could we proceed?
Would be it helpful to follow the upgrade path 14.2 > 15.x > 18.3 ?
Or even better from 14.2 to 18.3 directly?
What is the best way to migrate the current database data (with the added colums) to the new one ?
Thanks for you help,