How well the POI is working?



Is the database this one  \nis\data\nis4.h2.db ?
Are there any scripts/tools available for changing the database format to something more readable, eg. a textfile ?    ... haven't yet studied NEM APIs :)

Do you mean in general? That would kill the performance and is therfore not possible.
If you just want to be able to read whats in the db, there are tools for that.


yes, only read that db (offline)

Yes, you should consider the net output to an account.


For example, if you send 1000 NEM and receive 900 NEM, then the net outflow is (output-input=)100. That should give you a better metric.