> Sorry for not stating this earlier. It's possible for me to have ~20GB of > logs in one day. So, per day rotation is not the best option here. And
may be checking/modifying (in postgresql.conf): client_min_messages log_min_messages log_error_verbosity log_min_error_statement end "debug_print_xxx" lines too
looks like you turned a debug logging on and didn't switched it off.