LND's Deadline-Aware Budget Sweeper

Eclair and LDK are two systems which manage fee rates for transactions. Eclair, specifically, implements a strategy of exponential fee bumping as deadlines approach to ensure timely processing. This approach is taken because it's observed that when the estimator does not suggest an increased fee rate, exponential bumping can effectively push through transactions. The conversation reveals a shared understanding and agreement on the efficiency of using an exponential model under certain conditions.

Additionally, there's a proposition for introducing a more economical method that involves a grace period before initiating fee bumping based on a new budget-based fee function. This method suggests waiting until half the expected time plus one before adjusting fees, potentially reducing costs. This idea has been acknowledged as aligning with desired improvements and there's an intention to update Eclair to adopt a similar approach. This reflects an ongoing dialogue and collaboration among programmers to refine and enhance the mechanisms for managing transaction fees in these systems, indicating a focus on both efficiency and economy.