solana: deprecate auction history

[a5-pickle]

Instead of writing auction data to an auction history account, solvers can call the close auction instruction to write the auction data as instruction data (via Anchor's event CPI). Then solvers can completely reclaim all rent from the auction account.

[livthomas]

Why do we need to wait 2 hours before we're able to close the auction account? Isn't the fact that it has been Settled sufficient?

It would be nice if we were able to close auctions in the same transaction where we settle them. In order to do that with the current implementation, we would need to wait for almost two hours which we cannot afford to do as we want to get our funds back as soon as possible to optimize their utilization.

[a5-pickle]

This window exists so an auction cannot start using the same VAA within that arbitrarily long window. This duration can be tightened up in the future with a matching engine upgrade, though.

Reference:

example-liquidity-layer/solana/programs/matching-engine/src/processor/auction/offer/place_initial/cctp.rs

Lines 63 to 70 in fe2dcd1

	// Check to see if the deadline has expired.
	let deadline = order.deadline();
	let expiration =
	i64::from(fast_vaa.timestamp()).saturating_add(crate::VAA_AUCTION_EXPIRATION_TIME);
	require!(
	(deadline == 0 || curr_time < deadline.into()) && curr_time < expiration,
	MatchingEngineError::FastMarketOrderExpired,
	);