hi dear.
in my zabbix when i delete history for any item that returns FLOAT output ,trends table items have got deleted . this is true but
my problem is when i wanna delete unsigned int item history and trends , history_uint item delete but trends_uint not delete
by searching the forum i find that this problem exist in deleting items from web GUI too(https://support.zabbix.com/browse/ZBX-1438) and had fixed