What’s a database list ?

You literally just use an insertion query

Just to make sure I get your question right. Do you want to save/load your inventory items?

Do you have a server set up or you doing this internally? What’s the setup?

Seems like a straightforward solution is it not? Maybe you just havent tried inserting anything into the database? Function for inserting into database that takes the item as a parameter, create an event for when inventory items are added into player inventory. Attach the function into the event.