Hi @fonn,
Migration of a journal with DOI and URLs change is quite a challenge… But it is not connected with the OJS. It is connected with the DOI deposit/management at the CrossRef. What you have to do is:
- creating alias DOIs
- change URLs for the DOIs
Assigning aliases you have to do manually, while OJS can help you with changing URLs.
My personal opinion is that changing DOIs is not a good idea and correct approach.
Regards, Primož