[foo@bar zabbix-2.4.6]$ grep -r 'DBadd_trend_uint' .
./include/db.h:void     DBadd_trend_uint(zbx_uint64_t itemid, zbx_uint64_t value, int clock);
./src/libs/zbxdbhigh/db.c:void  DBadd_trend_uint(zbx_uint64_t itemid, zbx_uint64_t value, int clock)
./src/libs/zbxdbhigh/db.c:      const char      *__function_name = "DBadd_trend_uint";
[foo@bar zabbix-2.4.6]$