Expenses tracking project in PyQt4

QuickExpenses is a GUI program that allows you to quickly track your expenses by providing the interface for

• adding expenses that occured on a particular date while tagging those expenses with a user-defined set of "tags",
• displaying them in a table- or a tree-view, optionally filtering by existing tags.

It stores the data in a SQLite3 database; GUI is updated on the fly.

More importantly, writing QuickExpenses allowed me to practice developing a PyQt4 application (which I did for the first time in my life), and by that reason the program itself is not super feature-rich, but rather provides very basic, "raison d'être" functionality and may not be free of bugs. The TODO list currently consists of more than ten points, I believe, yet it's unlikely to get shorter anytime soon.