select count(*), filter_engine_id, filter_info_years, filter_info_description
from filtron_filter_engine_comments
group by filter_engine_id, filter_info_years, filter_info_description
order by 1 desc;

delete from dupes
from filtron_filter_engine_comments dupes, filtron_filter_engine_comments fullTable
where dupes.filter_engine_id = fullTable.filter_engine_id 
  and dupes.filter_info_years  = fullTable.filter_info_years 
  and dupes.filter_info_description  = fullTable.filter_info_description
  and dupes.filter_engine_comment_id > fullTable.filter_engine_comment_id;