last_pickled = Column(UtcDateTime)
    
    
    last_expired = Column(UtcDateTime)
    
    scheduler_lock = Column(Boolean)
    
    pickle_id = Column(Integer)
    
    
    
    
    fileloc = Column(String(2000))
    
    processor_subdir = Column(String(2000), nullable=True)
    
    owners = Column(String(2000))
    
    description = Column(Text)
    
    default_view = Column(String(25))
    
    schedule_interval = Column(Interval)
    
    timetable_description = Column(String(1000), nullable=True)
    
    tags = relationship("DagTag", cascade="all, delete, delete-orphan", backref=backref("dag"))
    
    dag_owner_links = relationship(
        "DagOwnerAttributes", cascade="all, delete, delete-orphan", backref=backref("dag")