I’ve worked around that enum error (since before owncloud 7 already) by adding this in 3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php:

@@ -661,6 +661,7 @@
     protected function initializeDoctrineTypeMappings()
     {
         $this->doctrineTypeMapping = array(
+            'enum' => 'string',
             'tinyint'       => 'boolean',
             'smallint'      => 'smallint',
             'mediumint'     => 'integer',

I think post-processing should also rip out (at least) id, class and style attributes from the content. Some pages I fetch using feedmod have elements with ids such as ”overlay” in them that pick up tt-rss’s styling, making things look wonky.