Mariel Cherkassky <mariel(dot)cherkassky(at)gmail(dot)com> writes:
> I'm trying to insert a few values into a foreign table via sqllite_fdw and
> my postgresql database crushes :
> ...
> any idea how can I investigate if the problem in the wrapper or in the
> database ?
Get a stack trace:
https://wiki.postgresql.org/wiki/Generating_a_stack_trace_of_a_PostgreSQL_backend
If the trace shows that the failure occurred in code of the wrapper,
I'd definitely blame the wrapper. If sqllite_fdw is nowhere to be seen
anywhere in the trace, then it's more debatable.
regards, tom lane