I’m moving from a self created forum with a custom database structure. There is no import script for the forum that I use. 
I’ve looked into the importscripts and found out that the vanilla import scripts uses a .csv file. I can export my forum to a .csv file BUT.. my .csv file is very clean and structured, the vanilla .csv file is not so it requires rly a lot of work to make my .csv file so messy that the vanilla importer takes it.
The other import scripts are not rly an option I think..
I now I wonder if I can migrate manualy by importing into the database but than I need to know where I have to import what. 