Fix all flake8 E* and F* errors

This was mostly unused modules or local variables.

Change-Id: I39f9598ba8b64101a10f80bae448d27272abeddd

1 files changed, 2 insertions, 2 deletions

diff --git a/taskflow/db/sqlalchemy/models.py b/taskflow/db/sqlalchemy/models.py
index 9ae6757..6f8a150 100644
--- a/taskflow/db/sqlalchemy/models.py
+++ b/taskflow/db/sqlalchemy/models.py
@@ -22,10 +22,10 @@ SQLAlchemy models for taskflow data.
 import json
 from oslo.config import cfg
 
-from sqlalchemy import Column, Integer, String, Table, MetaData
+from sqlalchemy import Column, Integer, String, Table
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.orm import object_mapper, relationship, backref
+from sqlalchemy.orm import object_mapper, relationship
 from sqlalchemy import DateTime, ForeignKey
 from sqlalchemy import types as types