Need to add nanoseconds column to order in request "last data" items.

now request is:
SELECT h.* FROM history_uint h WHERE h.itemid='123' AND h.clock>='1441031585' AND h.clock<='1441035195' ORDER BY h.itemid DESC,h.clock DESC LIMIT 1000 OFFSET 0

but mast be:
SELECT h.* FROM history_uint h WHERE h.itemid='123' AND h.clock>='1441031585' AND h.clock<='1441035195' ORDER BY h.itemid DESC,h.clock DESC,h.ns DESC LIMIT 1000 OFFSET 0

it critical if item get more than one value per second
p.s. and ordering by h.itemid not needed