No change after metatag bulk update in the database

Hi,

we rebuild our website with D8. We imported the old content and now I am at the place to bulk update the metatags for large subset of nodes automatically. I am using a small script which finds the correct entity_id`s and then does DB inserts like those

INSERT INTO `node__field_meta_tags` VALUES ('blog_entry',0,73280,5182,'en',0,'a:1:{s:6:\"robots\";s:17:\"noindex, nofollow\";}');
INSERT INTO `node_revision__field_meta_tags` VALUES ('blog_entry',0,73280,5182,'en',0,'a:1:{s:6:\"robots\";s:17:\"noindex, nofollow\";}');

For some reason however the metags representation is not updated either when I browse as a anonymous user or when I edit the node. I had run cron and cleared all cache using drush rc . I even went further and broke the serialisation for a test node to see if there would be some error -> none. All caches on the web server has been disabled etc. Not sure if drupal has some caches left after drush rc...

Regards,
T