I'm making an RPG in C++ and the items (loot/gear) will have immutable base versions, but then the player can get instantiations of them which can change with use and modification. These mutable instantiations will be saved in the DB. But I'm wondering if the base versions should be defined in JSON, or a separate DB (with the same schema), or maybe the same DB (seems dangerous), or if I should just hardcode them in C++ in the ItemFactory.

How have you approached this problem in your games? How do game engines do it? I'm using SDL2 so I'm doing most of these systems from scratch.