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::make_pair(std::string("pool"), nPool), keypool);
}
bool WalletBatch::ErasePool(int64_t nPool)
{
    return EraseIC(std::make_pair(std::string("pool"), nPool));
}
bool WalletBatch::WriteMinVersion(int nVersion)
{
    return WriteIC(std::string("minversion"), nVersion);
}
bool WalletBatch::ReadAccount(const std::string& strAccount, CAccount& account)
{
    account.SetNull();
    return m_batch.Read(std::make_pair(std::string("acc"), strAccount), account);
}
bool WalletBatch::WriteAccount(const std::string& strAccount, const CAccount& account)
{
    return WriteIC(std::make_pair(std::string("acc"), strAccount), account);
}
bool WalletBatch::EraseAccount(const std::string& strAccount)
{
    return EraseIC(std::make_pair(std::string("acc"), strAccount));
}
bool WalletBatch::WriteAccountingEntry(const uint64_t nAccEntryNum, const CAccountingEntry& acentry)
{
    return WriteIC(std::make_pair(std::string("acentry"), std::make_pair(acentry.strAccount, nAccEntryNum)), acentry);
}
CAmount WalletBatch::GetAccountCreditDebit(const std::string& strAccount)