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When pg_log_userqueries.log_superusers = on the extension log queries executed by bgworkers like powa with a trace like:

2017-12-20 09:19:13 CET [5956]: [4098802-1] user=,db=,client= LOG:  USERQUERIES SELECT powa_take_snapshot()

I guess that pg_log_userqueries might not log queries when the user or db is not set.

The title says it all. It would be interesting to be able to send the logs directly to a remote server, as this extension is interesting for forensics.

pg_log_userqueries use log level NOTICE by default, that mean that if you don't set log_min_message to notice nothing will be logged. You either need to change this default log level or write some information about that in documentation.

The current version allows to filter queries by, for example, username.
It might be useful to filter using negations, in this case since users can be added to the database at anytime.
Updating the filter each time is cumbersome and error prone.

A second argument is that, regex.h doesn't support look ahead / look behind.
The only way is to use this kind of horror : "^([^m])|(m[^a])|(ma[^c])" to filter out "mac".

You might need to add the following line at top of pg_log_userqueries.c

#include <time.h>

Regards