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When a channel is closed, we can forget the data from historical HTLCs sent and received through that channel (which is otherwise required to punish cheating attempts by our peer). We previously synchronously removed that data from the DB when the closing transaction confirmed. However, this could create performance issues as the `htlc_infos` table can be very large for busy nodes and many concurrent writes may be happening at the same time. We don't need to get rid of this data immediately: we only want to remove it to avoid degrading the performance of active channels that read and write to the `htlc_infos` table. We now mark channels as closed in a dedicated table, and run a background actor that deletes batches of obsolete htlc data at regular intervals. This ensures that the table is eventually cleaned up, without impacting the performance of active channels. When a splice transaction confirms, all the revoked commitment transactions that only applied to the previous funding transaction cannot be published anymore, because the previous funding output has already been spent. We can thus forget all the historical HTLCs that were included in those commitments, because we will never need to generate the corresponding penalty transactions. This ensures that the growth of our DB is bounded, and will shrink every time a splice transaction is confirmed. Fixes #2610, #2702 and #2740 |
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