Magnus Hagander <magnus@hagander.net> writes:
> In that case, why not put the trigger in core so people can use it
> easily?
One advantage of making it a contrib module is that discussing how/when
to use it would fit more easily into the structure of the
documentation. There is no place in our docs that a "standard trigger"
would fit without seeming like a wart; but a contrib module can document
itself pretty much however it wants.
regards, tom lane