Problems with SQL saving & opening inventories

I’ve got this sort of inventory system and I’m having an issue with how the system opens up the inventory after it has been saved.
What I’ve been told is that the files when saved are too large to open so they just don’t open at all.
I have basic lua knowledge so if you were to ask me to do something I’d probably not be able to do it, so please talk in simpletons terms.

If anyone is serious about giving me a hand here, just add me on steam. This code is private, this is the reason I don’t want it to be publicly released.

Thanks in advanced.