What does the archive days option mean? Will an archived item be automatically deleted after a while?
If the archived items do get deleted, is there a possibility to keep all the items (completed and not completed) forever in the database, for logging purposes?
No, the “archive days” setting aims to avoid loading the whole database. When it’s set to a few months, the size of the database is not important.
I think it should be left to the user if s/he wants to keep data indefinitely or not. A delete function in the Archive folder or better in the settings would do the job. I would appreciate a setting like this one: