text: # -- coding: utf-8 --
  
  from sqlalchemy import Column, String, Integer, Boolean, ForeignKey
  from sqlalchemy.orm import relationship
  from .model import model
  from enum import Enum
  
  class colQuality(model):
      __tablename__ = "col_quality"
  
      id = Column(Integer, primary_key=True)
      tid = Column(Integer, ForeignKey("tbl.id"))
      col = Column(String(1024))
      indicator = Column(Integer)
      value = Column(Integer)
      time = Column("t", Integer)
  
  class IndicatorTypes(Enum):
      NullValue = 1