Try beloe tables which might help, this is relevant to the query/web template favourites, the I table will help you let knoe if its a bookmarked via query/template.
SMEN_BUFFC - Table for Storing Favourites & SMEN_BUFFI - Links for Favourites
Also check for the FM BAPI_USER_WP_PERS_DATA_SAVE which is usually used to delete favourites
Thanks
Abhishek Shanbhogue