What does the migration file do?

Game Talk The Garage
1

Exactly as the title says or rather what do these migration do if anything?

2

When savegame is loaded certain entities (which are not in the game) from migration.json are transformed to other entities (which are still in the game).

3

When savegame is loaded certain entities (which are not in the game) from migration.json are transformed to other entities (which are still in the game).[/quote]
Oh. Neat. So I guess another question would be why can’t I change the mod location of the combat/fighting knives or rather why are those specific ids when used as weapon mods stock to the underbarrel slot?