I eventually used the dump from phpMyAdmin. Is there any example (or some more detailed specs) how to create the mapping sections in the (import) settings.yml?
My php_forums table looks like the following:
forum_id, MEDIUMINT(8) ... parent_id, MEDIUMINT(8) ...
3 0
8 3
7 3
9 3
10 3
11 0
12 11
13 11
14 11
15 11
17 3
It seems that whichever ids I use and no matter whether I also specify the “new_categories: ” section, the message generated by the import container is ok:
creating new categories
11 / 11 (100.0%) [2803 items/min] n]
creating categories
11 / 11 (100.0%) [2704 items/min]
but what is created are two main categories (that were “forums” in the phpBB with the parent_id 0) and one empty subcategory in each one of them. The procedure does import all posts but they are all "orphaned’.