_Originally posted by @S3RK in https://github.com/bitcoin/bitcoin/pull/24984#pullrequestreview-952900468_

> With current implementation we don't save the rescan progress and on the next load we will have to start from scratch. Is it possible to save the last processed blocked at shutdown?

It would be nice if wallet code would call `WriteBestBlock` and save the last scan position if it is interrupted during a sync. This could be implemented by trying to save the scan position during the shutdown, or by just periodically saving the scan position after an interval, similar to indexing code which saves sync position once every 30 seconds:

https://github.com/bitcoin/bitcoin/blob/f0a834e2f10a0aa60c7cc76e9f3eb090168a32e5/src/index/base.cpp#L170-L175
{
        if (!m_node.mempool) return IsRBFOptInEmptyMempool(tx);
        LOCK(m_node.mempool->cs);
        return IsRBFOptIn(tx, *m_node.mempool);
    }
    bool isInMempool(const uint256& txid) override
    {
        if (!m_node.mempool) return false;
        LOCK(m_node.mempool->cs);
        return m_node.mempool->exists(GenTxid::Txid(txid));
    }
    bool hasDescendantsInMempool(const uint256& txid) override
    {
        if (!m_node.mempool) return false;
        LOCK(m_node.mempool->cs);
        auto it = m_node.mempool->GetIter(txid);
        return it && (*it)->GetCountWithDescendants() > 1;
    }
    bool broadcastTransaction(const CTransactionRef& tx,
        const CAmount& max_tx_fee,
        bool relay,
        std::string& err_string) override
    {
        const TransactionError err = BroadcastTransaction(m_node, tx, err_string, max_tx_fee, relay, false);
        
        
        
        return TransactionError::OK == err;
    }
    void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants, size_t* ancestorsize, CAmount* ancestorfees) override