Implement the budget system

[Xiphoseer]

We planned and need a system that allows us to keep track of the amount of money that we spent. We have the data fields for that, but we can not really rely on any prices we know in advance. Need some input to figure this out.

[Xiphoseer]

I honestly have no clue on how useful a thing we can implement here. As long as we do not have real prices, we have to keep our eyes on that anyways.

[akwick]

One suggestion is that we rely on
a) the prices we obtain when we order
b) in the time between two orders, we rely on the prices stored in the books
c) when we reach an amount which is e.g. 10 % less than the budget, we can give the student a warning that it could happen that not every order can be processed anymore [0]. This should be fine as the library, will reject orders when we are going to exceed our limit. Further, when we receive a mail, we can react and can talk with the mint team of our library.

If we reach c) and have spent all our money on the budget and then, we can e.g. stop the order process by ending the ordering frame. Is that possible? Another alternative would be to somehow explicitly end all orders for the term (a simple boolean value).

I think that should okay as we have never exceeded the limit since I am part of the team.

[0] This also can happen if someone orders a book which already exists in a large amount in the library. So this should be fine.