Logging improvements and rehashing

Hello

It would be very nice to create a way to log only bad queries, which's
resulted in an error. This way a higher loglevel wouldn't be necessary.

one other thing,
by sending a SIGHUP to the postmaster it reinits it's config files. Now
i've made some store functions in C, and it would be very nice, if
postgres had re-opened these modules somehow. after overwriting the module
with the fresh-compiled version, the first query always crashed the
backend.

Bye,

Gergely Czuczy
mailto: phoemix(at)harmless(dot)hu
PGP: http://phoemix.harmless.hu/phoemix.pgp

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