_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
"\"receive\"               Non-coinbase transactions received.\n"
                                    "\"generate\"              Coinbase transactions received with more than 100 confirmations.\n"
                                    "\"immature\"              Coinbase transactions received with 100 or fewer confirmations.\n"
                                    "\"orphan\"                Orphaned coinbase transactions received."},
                                {RPCResult::Type::STR_AMOUNT, "amount", "The amount in " + CURRENCY_UNIT},
                                {RPCResult::Type::STR, "label", true, "A comment for the address/transaction, if any"},
                                {RPCResult::Type::NUM, "vout", "the vout value"},
                                {RPCResult::Type::STR_AMOUNT, "fee", true, "The amount of the fee in " + CURRENCY_UNIT + ". This is negative and only available for the \n"
                                    "'send' category of transactions."},
                                {RPCResult::Type::BOOL, "abandoned", true, "'true' if the transaction has been abandoned (inputs are respendable). Only available for the \n"
                                     "'send' category of transactions."},
                            }},
                        }},
                        {RPCResult::Type::STR_HEX, "hex", "Raw data for transaction"},
                        {RPCResult::Type::OBJ, "decoded", true, "The decoded transaction (only present when `verbose` is passed)",
                        {
                            {RPCResult::Type::ELISION, "", "Equivalent to the RPC decoderawtransaction method, or the RPC getrawtransaction method when `verbose` is passed."},
                        }},
                    })
                },
                RPCExamples{
                    HelpExampleCli("gettransaction", "\"1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d\"")
            + HelpExampleCli("gettransaction", "\"1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d\" true")
            + HelpExampleCli("gettransaction", "\"1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d\" false true")
            + HelpExampleRpc("gettransaction", "\"1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d\"")
                },
        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
    const std::shared_ptr<const CWallet> pwallet = GetWalletForJSONRPCRequest(request);
    if (!pwallet) return NullUniValue;