In the log I see things like:

    2017-09-13 03:54:33 init message: Rescanning...
    2017-09-13 03:54:33 Rescanning last 68616 blocks (from block 416339)...
    2017-09-13 03:54:40 AddToWallet xxxxx  update
    2017-09-13 03:55:33 Still rescanning. At block 418849. Progress=0.549138

I would be interested to see the wallet file name on each of these log lines.

Would there be any interest in merging such a PR?
else if (strType == "destdata")
        {
            std::string strAddress, strKey, strValue;
            ssKey >> strAddress;
            ssKey >> strKey;
            ssValue >> strValue;
            pwallet->LoadDestData(DecodeDestination(strAddress), strKey, strValue);
        }
        else if (strType == "hdchain")
        {
            CHDChain chain;
            ssValue >> chain;
            pwallet->SetHDChain(chain, true);
        } else if (strType == "flags") {
            uint64_t flags;
            ssValue >> flags;
            if (!pwallet->SetWalletFlags(flags, true)) {
                strErr = "Error reading wallet database: Unknown non-tolerable wallet flags found";
                return false;
            }
        } else if (strType != "bestblock" && strType != "bestblock_nomerkle") {
            wss.m_unknown_records++;
        }
    } catch (...)
    {
        return false;
    }
    return true;
}
bool WalletBatch::IsKeyType(const std::string& strType)