Option 1:
Introduce another variable inside SECTORINFO used for the last time (game minutes) we have updated all items for that sector.
This approach brakes savegame compatibility.

Option 2:
Create a static array inside the decay handling function which holds the time at which all items in various sectors has been updated.
There is a problem here: one cant determine if a completly different savegame is loaded. To do make it work we need some global variable which tells us if our current save game is the one which matches our static times.
This also requires frequent recalculation of the static array after autosave, save and load.

Option 3:
Dont update uiTimeCurrentSectorWasLastLoaded when showing items in sector inventory.
Instead one must add the delta decay to the items before showing them and remove the delta decay (or trash the itemlists) when closing the sector inventory.
Let the final modification be handled when player is actually entering the sector.

Option 4:
Dont update item decay when showing the sector inventory.
The player will see outdated values in DB and tooltips and needs to enter a sector to get the correct values.

Option 5:
update decay as usual on enterSector and on showing the sector inventory by overwriting the uiTimeCurrentSectorWasLastLoaded.
This may brake some (potential) quest code, visual effects like smoke, rotting corpse ec.
They are actually broken allready, so we dont care!?