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?
{
    LOCK(cs_wallet); 
    if (nWalletVersion >= nVersion)
        return;
    
    if (fExplicit && nVersion > nWalletMaxVersion)
            nVersion = FEATURE_LATEST;
    nWalletVersion = nVersion;
    if (nVersion > nWalletMaxVersion)
        nWalletMaxVersion = nVersion;
    {
        WalletBatch* batch = batch_in ? batch_in : new WalletBatch(*database);
        if (nWalletVersion > 40000)
            batch->WriteMinVersion(nWalletVersion);
        if (!batch_in)
            delete batch;
    }
}
bool CWallet::SetMaxVersion(int nVersion)
{
    LOCK(cs_wallet); 
    
    if (nWalletVersion > nVersion)
        return false;
    nWalletMaxVersion = nVersion;
    return true;
}
std::set<uint256> CWallet::GetConflicts(const uint256& txid) const