Python + Flask App runs from wrong folder after run by Pycharm on 127.0.0.1

Setup:

I have created and populated a sqllite database in Pycharm, running Python + Flask + SQLAlchemy.
The code works perfectly in the console, but when i run it, i get a:

OperationalError: (sqlite3.OperationalError) unable to open database file

Problem:

When i run print os.getcwd() in Chrome/Flask-Werkzeug:

C:\Program Files (x86)\JetBrains\PyCharm 4.0.6\jre\jre\bin.

that is the wrong folder. The whole project, including the .db is in C:\Users\Finn\PycharmProjects. Why is that and what do i do about it?

Code:

Base = declarative_base()
engine = create_engine("sqlite:///temp/database.db")
DBSession = sessionmaker(bind=engine)
session = DBSession()

**more Imports, DB-Setup & Classes**

class DBHandl():
    @classmethod
    def getData(self):  # Return Personen + Adressen
        q = session.query(Person, Address).filter(Person.id == Address.person_id).all()
        return q

@app.route('/')
def hello_world():
    q = DBHandl.getData()
    return render_template("home.html", list=q)