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 == "pool")
        {
            int64_t nIndex;
            ssKey >> nIndex;
            CKeyPool keypool;
            ssValue >> keypool;
            pwallet->LoadKeyPool(nIndex, keypool);
        }
        else if (strType == "version")
        {
            ssValue >> wss.nFileVersion;
            if (wss.nFileVersion == 10300)
                wss.nFileVersion = 300;
        }
        else if (strType == "cscript")
        {
            uint160 hash;
            ssKey >> hash;
            CScript script;
            ssValue >> script;
            if (!pwallet->LoadCScript(script))
            {
                strErr = "Error reading wallet database: LoadCScript failed";
                return false;
            }
        }
        else if (strType == "orderposnext")
        {
            ssValue >> pwallet->nOrderPosNext;
        }