I’ve grown grapes in pots in my greenhouse. They stay inside all yr long. Like most other fruits it’s much easier inside. The berries tend to be bigger but not necessarily sweeter inside. All tend to run mid to upper 20s brix.
The second and third pictures are grapes on vines in the second leaf. So that’s 15-16 months after starting with a half inch twig about a food long.
The only pest inside the greenhouse on grapes is powdery mildew. Didn’t have that until the last two yrs.