routing and model __init__ updates

api/target_exchange/models.py

@@ -1,11 +1,14 @@
 from api.database import (Model, SurrogatePK, db,
-                          Column, reference_col, relationship)
+                          Column)
 
 
 class TargetExchange(SurrogatePK, Model):
     __tablename__ = "target-exchange"
     name = Column(db.String(255), unique=True, nullable=False)
 
+    def __init__(self, **kwargs):
+        super(TargetExchange, self).__init__(**kwargs)
+
     @staticmethod
     def ensure_created(name):
         if TargetExchange.query.filter_by(name=name).first() is None: