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04 — Bid Increase / Supersede

Sequence diagram: a bidder raising their existing bid. The previous bid is immutable and is only audit-marked; a new row is inserted with a supersedes pointer.

The API checks creative approval before AuctionDO validates a bid increase. A transaction inserts the replacement and supersedes the previous bid, rejecting races. The auction updates its closing time when applicable and broadcasts the new rank.The API checks creative approval before AuctionDO validates a bid increase. A transaction inserts the replacement and supersedes the previous bid, rejecting races. The auction updates its closing time when applicable and broadcasts the new rank.