Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
> ts=# CREATE INDEX ON t(i) ;
> CREATE INDEX
> ts=# DROP INDEX t_i_idx ;
> NOTICE: 00000: drop_trigger
> LOCATION: exec_stmt_raise, pl_exec.c:3748
> DROP INDEX
Maybe you've got an event trigger hanging around in that DB?
regards, tom lane