Per surface, because the surfaces carry different risk. Getting a purchase order wrong costs a phone call; getting a bid wrong costs money every hour until someone notices.
Ops writes
purchase orders, costs, restock, receiving
live
Listing writes
titles, bullets, images, attributes
live
Ads writes
bids, budgets, negatives, placements
27 staged
Price writes
marketplace prices and floors
6 staged
Turning a surface on does not replay what queued while it was off. The backlog is presented for approval or discard, item by item, because a bid computed nine days ago against different stock is not a bid you want sent today.