[BW]: fixes to found bugs

• defined vw_hive_posts to simplify queries and eliminate joins at query side
• fixed fatal bug in special characters escaping leading to modification of post body, title etc
• fixed bug in querying for root_title in condnser_api/tags_api get_comment_discussions_by method family
• fixed bug in querying for post url
• eliminated unneeded fields in _condenser_post_object causing returning not needed additional data
• tags_api group enabled in 5M smokest

hive/db/schema.py

@@ -585,7 +585,7 @@ def setup(db):
     db.query_no_return(sql)
 
     sql = """
-        DROP VIEW public.vw_hive_posts;
+        DROP VIEW IF EXISTS public.vw_hive_posts;
 
         CREATE OR REPLACE VIEW public.vw_hive_posts
           AS