When the current balance is edited, the correct one must be shown on the balance history, not both the correct and the older/incorrect

In the users choices of the dates for a specific balance, the DATE FROM must be less or equal to the DATE TO

When a purchase in made, the date must be inside the current dates balance

Older balances can be chosen in order to view past purchases, NOT modify them or the balance

If there is an invalid value or some necessary values are missing, a notification should be shown on the screen

Whenever a user adds a new purchase category, it isn't stored to the base, causing it to disappear after a restart.

Add a feature to give the user the opportunity to take a picture of the product. This feature is for mostly for mobile devices and has to be interconnected with the camera.

When a user adds a new purchase, the balance is changed correctly on the screen, but it isn't saved to the database. So if the application is restarted, the old balance will appear.

Change vectors to a more suitable data structure.
vectors are: agores, catigories.

After a new purchase is made, the updated balance is shown in a very long format. Correct this for a better user experience, by using 2 floating numbers.

When a new purchase is done, the user can add negative amount of money spent. Fix that

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