fix!: remove error returned when tx is missing

Rather than returning an error when transaction corresponding to an
anchor and last_seen, first_seen, last_evicted timestamps is missing
we instead quietly insert the anchor or timestamps in the db. This is in
accordance with the sqlite persistence.

Author: 110CodingP

src/error.rs

@@ -1,6 +1,5 @@
 #![warn(missing_docs)]
 //! This module contains the crate's error type.
-use bdk_chain::bitcoin;
 use std::io::Error as IoError;
 
 #[derive(Debug, thiserror::Error)]
@@ -35,8 +34,4 @@ pub enum StoreError {
     /// [`BlockHash`]: <https://docs.rs/bitcoin/latest/bitcoin/struct.BlockHash.html>
     #[error("BlockHash deserialization error: {0}")]
     BlockHashFromSlice(#[from] bdk_chain::bitcoin::hashes::FromSliceError),
-    /// Error thrown when tx corresponding to txid is not found while persisting
-    /// anchors, last_seen, last_evicted or first_seen.
-    #[error("Tx corresponding to txid is missing")]
-    TxMissing(bitcoin::Txid),
 }