Refactor Stocktake in service layer

[roxy-dao]

The suggestion

The stocktake insert/update files are getting really big and would be nice if some of the functions can be moved out into their own validate/generate files like in the rest of the repo.

Why should we invest time in this?

Nicer to read! And way easier to navigate through~

Are there any risks associated with this change?

Shouldn't be any risks?

How much effort is required?

Might take a few hours to move things out and make sure nothing has broken~

Agreed Solution