class_docstr: Model that stores a history of the SLA that have been missed.
  
  It is used to keep track of SLA failures over time and to avoid double triggering alert emails.
class_docstr_tok: ["Model","that","stores","a","history","of","the","SLA","that","have","been","missed",".","It","is","used","to","keep","track","of","SLA","failures","over","time","and","to","avoid","double","triggering","alert","emails","."]
code: def __repr__(self):
      return str(
          (self.dag_id, self.task_id, self.execution_date.isoformat())
      )
  
imports: from __future__ import annotations
  from sqlalchemy import Boolean, Column, Index, String, Text
  from airflow.models.base import COLLATION_ARGS, ID_LEN, Base
  from airflow.utils.sqlalchemy import UtcDateTime
label_desc: Use image node_id 1 for calling the SlaMiss obj's underlying member method code with example usage: obj.__repr__() and returns: str