Simplify schema and error handling

core/models.py

@@ -5,7 +5,6 @@ from django.db import models
 
 from core.exchanges.alpaca import AlpacaExchange
 from core.exchanges.oanda import OANDAExchange
-from core.lib import trades
 from core.lib.customers import get_or_create, update_customer_fields
 from core.util import logs
 
@@ -100,7 +99,7 @@ class Account(models.Model):
         if self.exchange in EXCHANGE_MAP:
             return EXCHANGE_MAP[self.exchange](self)
         else:
-            raise Exception("Exchange not supported")
+            raise Exception(f"Exchange not supported : {self.exchange}")
 
     @property
     def client(self):