I'm sorry, it wasn't clear from my earlier post that the triggers are
dependent on a function provided by the extension.
So when you do CREATE EXTENSION foo, it creates foo_somefunc() that
RETURNS TRIGGER. Later, a trigger is created (somehow; in this case it
is by some other function in the extension, but it could be by the user
directly as well) that executes this function.
But that's only a partial answer to the questions raised here, and I'll
return to the drawing board and draw up a more complete explanation.
Thanks for reading.
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