I seen a lot of people say it's as easy as sending all utxo to a single newly created receive addr on the same wallet with 1sat fee. Is that right? Wouldn't that never ever confirm at 1sat or am I missing something?

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I don't think they ever get lost. I know a mempool with a 5GB capacity. Receipts are kept. It doesn't mean that they'll ever be added to a block though. A 1.1 sat/vB is a better.