diff --git a/rhodecode/model/db.py b/rhodecode/model/db.py
--- a/rhodecode/model/db.py
+++ b/rhodecode/model/db.py
@@ -27,6 +27,7 @@ import os
 import logging
 import datetime
 import traceback
+import hashlib
 from collections import defaultdict
 
 from sqlalchemy import *
@@ -43,9 +44,8 @@ from rhodecode.lib.utils2 import str2boo
     safe_unicode
 from rhodecode.lib.compat import json
 from rhodecode.lib.caching_query import FromCache
+from rhodecode.model.meta import Base, Session
 
-from rhodecode.model.meta import Base, Session
-import hashlib
 
 URL_SEP = '/'
 log = logging.getLogger(__name__)
@@ -152,11 +152,12 @@ class BaseModel(object):
             return safe_str(self.__unicode__())
         return '<DB:%s>' % (self.__class__.__name__)
 
+
 class RhodeCodeSetting(Base, BaseModel):
     __tablename__ = 'rhodecode_settings'
     __table_args__ = (
         UniqueConstraint('app_settings_name'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
     app_settings_id = Column("app_settings_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -222,7 +223,7 @@ class RhodeCodeSetting(Base, BaseModel):
                 .filter(cls.app_settings_name.startswith('ldap_')).all()
         fd = {}
         for row in ret:
-            fd.update({row.app_settings_name:row.app_settings_value})
+            fd.update({row.app_settings_name: row.app_settings_value})
 
         return fd
 
@@ -231,7 +232,7 @@ class RhodeCodeUi(Base, BaseModel):
     __tablename__ = 'rhodecode_ui'
     __table_args__ = (
         UniqueConstraint('ui_key'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
 
@@ -282,7 +283,7 @@ class User(Base, BaseModel):
     __tablename__ = 'users'
     __table_args__ = (
         UniqueConstraint('username'), UniqueConstraint('email'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
     user_id = Column("user_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -404,7 +405,7 @@ class User(Base, BaseModel):
 class UserLog(Base, BaseModel):
     __tablename__ = 'user_logs'
     __table_args__ = (
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
     user_log_id = Column("user_log_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -426,7 +427,7 @@ class UserLog(Base, BaseModel):
 class UsersGroup(Base, BaseModel):
     __tablename__ = 'users_groups'
     __table_args__ = (
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
 
@@ -468,7 +469,7 @@ class UsersGroup(Base, BaseModel):
 class UsersGroupMember(Base, BaseModel):
     __tablename__ = 'users_groups_members'
     __table_args__ = (
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
 
@@ -488,7 +489,7 @@ class Repository(Base, BaseModel):
     __tablename__ = 'repositories'
     __table_args__ = (
         UniqueConstraint('repo_name'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
 
@@ -704,7 +705,7 @@ class Repository(Base, BaseModel):
             # get using prefilled cache_map
             invalidate_repo = cache_map[self.repo_name]
             if invalidate_repo:
-                invalidate_repo = (None if invalidate_repo.cache_active 
+                invalidate_repo = (None if invalidate_repo.cache_active
                                    else invalidate_repo)
         else:
             # get from invalidate
@@ -747,7 +748,7 @@ class RepoGroup(Base, BaseModel):
     __table_args__ = (
         UniqueConstraint('group_name', 'group_parent_id'),
         CheckConstraint('group_id != group_parent_id'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
     __mapper_args__ = {'order_by': 'group_name'}
@@ -876,7 +877,7 @@ class RepoGroup(Base, BaseModel):
 class Permission(Base, BaseModel):
     __tablename__ = 'permissions'
     __table_args__ = (
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
     permission_id = Column("permission_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -915,7 +916,7 @@ class UserRepoToPerm(Base, BaseModel):
     __tablename__ = 'repo_to_perm'
     __table_args__ = (
         UniqueConstraint('user_id', 'repository_id', 'permission_id'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
     repo_to_perm_id = Column("repo_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -944,7 +945,7 @@ class UserToPerm(Base, BaseModel):
     __tablename__ = 'user_to_perm'
     __table_args__ = (
         UniqueConstraint('user_id', 'permission_id'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
     user_to_perm_id = Column("user_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -959,7 +960,7 @@ class UsersGroupRepoToPerm(Base, BaseMod
     __tablename__ = 'users_group_repo_to_perm'
     __table_args__ = (
         UniqueConstraint('repository_id', 'users_group_id', 'permission_id'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
     users_group_to_perm_id = Column("users_group_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -988,7 +989,7 @@ class UsersGroupToPerm(Base, BaseModel):
     __tablename__ = 'users_group_to_perm'
     __table_args__ = (
         UniqueConstraint('users_group_id', 'permission_id',),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
     users_group_to_perm_id = Column("users_group_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -1003,7 +1004,7 @@ class UserRepoGroupToPerm(Base, BaseMode
     __tablename__ = 'user_repo_group_to_perm'
     __table_args__ = (
         UniqueConstraint('user_id', 'group_id', 'permission_id'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
 
@@ -1021,7 +1022,7 @@ class UsersGroupRepoGroupToPerm(Base, Ba
     __tablename__ = 'users_group_repo_group_to_perm'
     __table_args__ = (
         UniqueConstraint('users_group_id', 'group_id'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
 
@@ -1039,7 +1040,7 @@ class Statistics(Base, BaseModel):
     __tablename__ = 'statistics'
     __table_args__ = (
          UniqueConstraint('repository_id'),
-         {'extend_existing': True, 'mysql_engine':'InnoDB',
+         {'extend_existing': True, 'mysql_engine': 'InnoDB',
           'mysql_charset': 'utf8'}
     )
     stat_id = Column("stat_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -1057,7 +1058,7 @@ class UserFollowing(Base, BaseModel):
     __table_args__ = (
         UniqueConstraint('user_id', 'follows_repository_id'),
         UniqueConstraint('user_id', 'follows_user_id'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
 
@@ -1082,7 +1083,7 @@ class CacheInvalidation(Base, BaseModel)
     __table_args__ = (
         UniqueConstraint('cache_key'),
         Index('key_idx', 'cache_key'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
     cache_id = Column("cache_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
@@ -1128,7 +1129,7 @@ class CacheInvalidation(Base, BaseModel)
             try:
                 inv_obj = CacheInvalidation(key, org_key)
                 Session.add(inv_obj)
-                #Session.commit()
+                Session.commit()
             except Exception:
                 log.error(traceback.format_exc())
                 Session.rollback()
@@ -1194,7 +1195,7 @@ class CacheInvalidation(Base, BaseModel)
                 fixkey = kwargs.get('fixkey')
                 if fixkey:
                     del kwargs['fixkey']
-                self.fixkey = fixkey 
+                self.fixkey = fixkey
                 super(cachemapdict, self).__init__(*args, **kwargs)
 
             def __getattr__(self, name):
@@ -1223,7 +1224,7 @@ class CacheInvalidation(Base, BaseModel)
 class ChangesetComment(Base, BaseModel):
     __tablename__ = 'changeset_comments'
     __table_args__ = (
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
     comment_id = Column('comment_id', Integer(), nullable=False, primary_key=True)
@@ -1255,7 +1256,7 @@ class ChangesetComment(Base, BaseModel):
 class Notification(Base, BaseModel):
     __tablename__ = 'notifications'
     __table_args__ = (
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
 
@@ -1310,7 +1311,7 @@ class UserNotification(Base, BaseModel):
     __tablename__ = 'user_to_notification'
     __table_args__ = (
         UniqueConstraint('user_id', 'notification_id'),
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'}
     )
     user_id = Column('user_id', Integer(), ForeignKey('users.user_id'), primary_key=True)
@@ -1330,7 +1331,7 @@ class UserNotification(Base, BaseModel):
 class DbMigrateVersion(Base, BaseModel):
     __tablename__ = 'db_migrate_version'
     __table_args__ = (
-        {'extend_existing': True, 'mysql_engine':'InnoDB',
+        {'extend_existing': True, 'mysql_engine': 'InnoDB',
          'mysql_charset': 'utf8'},
     )
     repository_id = Column('repository_id', String(250), primary_key=True)