Warehouse Inventory Database Modal

I got my first professional project where I have to create a warehouse inventory web application. I have completed the front-end however I am stuck on the database modal - I'm not entirely sure if I got it right.

(ignore the scribble)

Basically, the company only needs to keep track of their stock level in each of their warehouse and do not need to add supplier details or any cost/sale prices.

These are all the tables and links I could think of however, even though this might work (or not), is this the correct design modal? (specifially the central table) . .