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and `into_confirmation_time_tx_graph`, since now it makes sense to use `TxGraph::update_last_seen_unconfirmed`. Also, use `update_last_seen_unconfirmed` in examples for electrum/esplora. We show how to update the last seen time for transactions by calling `update_last_seen_unconfirmed` on the graph update returned from a blockchain source, passing in the current time, before applying it to another `TxGraph`.