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?
{
    return WriteIC(std::string("hdchain"), chain);
}
bool WalletBatch::WriteWalletFlags(const uint64_t flags)
{
    return WriteIC(std::string("flags"), flags);
}
bool WalletBatch::TxnBegin()
{
    return m_batch.TxnBegin();
}
bool WalletBatch::TxnCommit()
{
    return m_batch.TxnCommit();
}
bool WalletBatch::TxnAbort()
{
    return m_batch.TxnAbort();
}
bool WalletBatch::ReadVersion(int& nVersion)
{
    return m_batch.ReadVersion(nVersion);
}
bool WalletBatch::WriteVersion(int nVersion)
{
    return m_batch.WriteVersion(nVersion);
}