_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
int GetVersion() const { LOCK(cs_wallet); return nWalletVersion; }
    
    std::set<uint256> GetConflicts(const uint256& txid) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    
    bool HasWalletSpend(const uint256& txid) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    
    void Flush();
    
    void Close();
    
    boost::signals2::signal<void ()> NotifyUnload;
    /**
     * Address book entry changed.
     * @note called without lock cs_wallet held.
     */
    boost::signals2::signal<void(const CTxDestination& address,
                                 const std::string& label, bool isMine,
                                 const std::string& purpose, ChangeType status)>
        NotifyAddressBookChanged;
    /**
     * Wallet transaction added, removed or updated.
     * @note called with lock cs_wallet held.
     */
    boost::signals2::signal<void(const uint256& hashTx, ChangeType status)> NotifyTransactionChanged;