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?
if (!AddToWalletIfInvolvingMe(ptx, pindex, posInBlock, update_tx))
        return; 
    
    
    
    MarkInputsDirty(ptx);
}
void CWallet::TransactionAddedToMempool(const CTransactionRef& ptx) {
    LOCK2(cs_main, cs_wallet);
    SyncTransaction(ptx);
    auto it = mapWallet.find(ptx->GetHash());
    if (it != mapWallet.end()) {
        it->second.fInMempool = true;
    }
}
void CWallet::TransactionRemovedFromMempool(const CTransactionRef &ptx) {