What is the inventory used for, e.g what is its purpose?
It was originally a feature I used internally to track parts we had for benchmarking. Then I exposed it to users, which in hindsight was probably a major mistake - I'd love to simplify things and get rid of it, but there are a small set of users who actually use it.
It's for what you have already.
Could be useful for businesses that need to keep track of all the parts they have and what they paid for it.