Instead of inserting anchors and seen_at timestamp in the same method, we have three separate methods. This makes the API easier to understand and makes `IndexedTxGraph` more consistent with the `TxGraph` API.
Instead of inserting anchors and seen_at timestamp in the same method, we have three separate methods. This makes the API easier to understand and makes `IndexedTxGraph` more consistent with the `TxGraph` API.