Forum OpenACS Q&A: TclCLIPS
CLIPS was intended was as a toolkit for building expert systems, and unfortunately, nothing I saw in the docs or FAQ mentioned integration with RDBMSs like Postgres. (There has definitely been research work into that sort of thing elsewhere, though.) It is also unclear how applicable CLIPS would be to non expert system production systems, like Jerry's large scale automated online exchange that started off this thread. Question 24 in the CLIPS FAQ, "Can CLIPS be used for real time applications?", implies that it may not scale to such demanding service loads, but mentions only the underlying Rete algorithm itself as a possibly bottleneck, so perhaps updating CLIPS to use newer algorithms like LEAPS would address any such problems.