Hi Maxim, I guess this is not explained that well, but the service-extension snippet is supposed to go under the (extensions ...) field of a <service-type> record. If you want to extend this in your system config, you want (simple-service ...) instead, with e.g.
--8<---------------cut here---------------start------------->8---
(simple-service 'alice-role postgresql-role-service-type
(postgresql-role
(name "alice")
(create-database? #t)))
--8<---------------cut here---------------end--------------->8---
Best,
--
Josselin Poiret
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