new_contents: from sqlalchemy import Column, String, Sequence, Integer
  
  from virtool.postgres import Base
  
  
  class Label(Base):
      __tablename__ = 'labels'
  
      id = Column(Integer, Sequence('labels_id_seq'), primary_key=True)
      name = Column(String, unique=True)
      color = Column(String(length=7))
      description = Column(String)
  
      def __repr__(self):
          return "<Label(id= '%s', name='%s', color='%s', description='%s')>" % (
              self.id, self.name, self.color, self.description)
  
subject: Add virtool.labels.models