✨ (db query) expenditure forecasting imlemented

[SeePeeYou]

• expected return object; two arrays
• namely averagesArray of 4 values, the values are listed in descending order in the sense that the value at index 0 is the last point in the graph and the value at index 3 is the first point.
• also expect a futureDates array of 4 dates. the dates are listed in descending order in the sense that the value at index 0 is the last date in the graph and the value at index 3 is the first date.

[Grobbies26]

Ill let Christian approve this since hes going to be working with it, and then he can see the code and understand it better before he uses it.