select * from history_uint where itemid ='28633' order by clock;
28633 | 1522686433 | 1000000000 | 513186399
28633 | 1522688234 | 1000000000 | 31574780
28633 | 1522690033 | 1000000000 | 137008659
28633 | 1522691833 | 1000000000 | 348876345
28633 | 1522693633 | 1000000000 | 338707785
28633 | 1522695433 | 1000000000 | 578575896
28633 | 1522697233 | 1000000000 | 554737552
28633 | 1522699033 | 1000000000 | 560403383

select * from history_uint where itemid ='28634' order by clock;
28634 | 1522681034 | 50000000 | 907893162
28634 | 1522682834 | 50000000 | 144923656
28634 | 1522684634 | 50000000 | 158871142
28634 | 1522686434 | 50000000 | 961753385
28634 | 1522688234 | 50000000 | 177811923
28634 | 1522690034 | 50000000 | 415253772
28634 | 1522691834 | 50000000 | 607262077
28634 | 1522693634 | 50000000 | 600455923
28634 | 1522695434 | 50000000 | 176735208
28634 | 1522697235 | 50000000 | 61048012
28634 | 1522699034 | 50000000 | 733709449
28634 | 1522700834 | 50000000 | 133920027

the problem in preprocessing
for 1.3.6.1.2.1.31.1.1.1.15.1 value is 100
snmpget -v2c -c *** 10.8.64.2 1.3.6.1.2.1.31.1.1.1.15.1
iso.3.6.1.2.1.31.1.1.1.15.1 = Gauge32: 100

Custom multiplier is 1000000
in BD value is 1000000000
100*1000000 =100000000 but not 1000000000

for snmpget -v2c -c *** 10.8.64.2 1.3.6.1.2.1.31.1.1.1.15.2
iso.3.6.1.2.1.31.1.1.1.15.2 = Gauge32: 50
Custom multiplier is 1000000
in BD value is 50000000