def METHOD_NAME(self, add_default=True):
    """Initialise the database schema from an empty database."""
    logging.info("Creating database tables")
    from pytrainer.core.sport import Sport
    from pytrainer.core.equipment import Equipment
    from pytrainer.waypoint import Waypoint
    from pytrainer.core.activity import Lap
    from pytrainer.athlete import Athletestat
    DeclarativeBase.metadata.create_all(self.engine)
    if add_default:
        for item in [Sport(name=u"Mountain Bike", weight=0.0, color=color_from_hex_string("0000ff")),
                     Sport(name=u"Bike", weight=0.0, color=color_from_hex_string("00ff00")),
                     Sport(name=u"Run", weight=0.0, color=color_from_hex_string("ffff00"))]:
            self.session.add(item)
        self.session.commit()