proposal to update only one Storage
local storage = 25000
local c = {
[{1,5}] = {
[15] = {items = {{itemid = 2160, count = 1}}, storage = 1},
[30] = {items = {{itemid = 2160, count = 1}, {itemid = 2160, count = 3}}, storage = 2},
[45] = {items = {{itemid = 2160, count = 1}...