It's possible to check original values on 0.23 hivemind. It has to be done manually, due to the error when `last_month` is calculated.

Example:
params: {"tag":"blocktrades","start_author":"michelle.gent","start_permlink":"dusty-the-demon-hunter-part-4","limit":10}
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a) Find id of account:
select * from hive_accounts where name = 'blocktrades'
found: `441`
------------
b) Find post's id for given author and permlink
SELECT id FROM hive_posts WHERE author = 'michelle.gent' AND permlink = 'dusty-the-demon-hunter-part-4'
found: `711172`
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Following query is taken from 0.23 version( for 5 million blocks ).
c) Put calculated values instead of _ID_ACCOUNT, _POST_ID, _LIMIT.
-----------
select hpc.post_id, hpc.author, hpc.permlink
FROM hive_posts_cache hpc
JOIN
(
SELECT post_id
FROM hive_feed_cache
JOIN hive_follows ON account_id = hive_follows.following AND state = 1
JOIN hive_accounts ON hive_follows.following = hive_accounts.id
WHERE hive_follows.follower = _ID_ACCOUNT(here 441)
 AND hive_feed_cache.created_at > ( '2016-09-15 19:47:15.0'::timestamp - interval '1 month' )
GROUP BY post_id 
          HAVING MIN(hive_feed_cache.created_at) <= ( 
                      SELECT MIN(created_at) FROM hive_feed_cache WHERE post_id = _POST_ID(here 711172)
               AND account_id IN (SELECT following FROM hive_follows
                                  WHERE follower = _ID_ACCOUNT(here 441) AND state = 1))
ORDER BY MIN(hive_feed_cache.created_at) DESC
) T ON hpc.post_id = T.post_id
ORDER BY post_id DESC
LIMIT _LIMIT(here 10)
------------
