GIN index uses to find posts by tag

-remove hive_post_tags table -extend hive_posts for a column with an arrays of tags id -tags are added next after a post, not in paralles as it was previously -fix bug with not removing tags for a post whose author removed tags during edition

hive/db/sql_scripts/upgrade/upgrade_table_schema.sql

@@ -392,3 +392,6 @@ DROP INDEX IF EXISTS hive_posts_promoted_idx;
 CREATE INDEX IF NOT EXISTS hive_posts_promoted_id_idx ON hive_posts (promoted, id)
   WHERE NOT is_paidout AND counter_deleted = 0
  ;
+
+
+ CREATE INDEX IF NOT EXISTS hive_posts_tags_ids_idx ON hive_posts USING gin(tags_id gin__int_ops);