@Hoppel don't add manufacturer data in one place like this: https://fastestlaps.com/edit-pub/z44bl8h00ka3
I put it in separate files under each manufacturer organization. In some cases I have parent company for multiple brands - like I put Porsche official stuff under "VW Group".
If you don't see appropriate parent company organization as category just don't bother with manufacturer data. Either I can add it or it can be ignored because most of the time there is independent data coming anyway.
For old data you see "manufacturer data" as reference. This was because back then there was different system and it was blanket generic reference text for all manufacturer data.
To be honest, I don't even know if it was a good idea to place manufacturer data under separate categories, because it is quite a pain to create organization for each manufacturer :D
Maybe the way you did it with one file was better idea, but not its too late.