dstandish commented on a change in pull request #22260:
URL: https://github.com/apache/airflow/pull/22260#discussion_r827459364



##########
File path: airflow/models/taskfail.py
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@@ -28,22 +29,42 @@ class TaskFail(Base):
     __tablename__ = "task_fail"
 
     id = Column(Integer, primary_key=True)
-    task_id = Column(String(ID_LEN, **COLLATION_ARGS), nullable=False)
-    dag_id = Column(String(ID_LEN, **COLLATION_ARGS), nullable=False)
-    execution_date = Column(UtcDateTime, nullable=False)
+    task_id = Column(StringID(), nullable=False)
+    dag_id = Column(StringID(), nullable=False)
+    run_id = Column(StringID(), nullable=False)
+    map_index = Column(Integer, server_default='-1', nullable=False)

Review comment:
       question @uranusjr  @ashb ...
   
   the uniqueness of these 4 attributes will be enforced through the foreign 
key.  do you think that we should also add a unique index though for 
performance reasons?  




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