Removing unique constraint on conn_id

airflow/models.py

@@ -280,7 +280,7 @@ class Connection(Base):
     __tablename__ = "connection"
 
     id = Column(Integer(), primary_key=True)
-    conn_id = Column(String(ID_LEN), unique=True)
+    conn_id = Column(String(ID_LEN))
     conn_type = Column(String(500))
     host = Column(String(500))
     schema = Column(String(500))