def __init__(self, backend=BaseBackend(), event_handler=None):
""" Construct a new Dagobah instance with a specified Backend. """
self.backend = backend
self.event_handler = event_handler
self.dagobah_id = self.backend.get_new_dagobah_id()
self.jobs = []
self.created_jobs = 0
self.scheduler = Scheduler(self)
self.scheduler.daemon = True
self.scheduler.start()
self.commit()
