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Procédure pour activer module `pgcrypto`

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[Install]
WantedBy=multi-user.target
~~~

### Activer module `pgcrypto`

Dans le *shell* `psql` :

~~~
hostname=# drop extension pgcrypto;
hostname=# create extension pgcrypto;
~~~

Pour vérifier :

~~~
hostname=# select pg_get_functiondef(to_regproc('gen_random_uuid'));
pg_get_functiondef
-----------------------------------------------------------
CREATE OR REPLACE FUNCTION public.gen_random_uuid() +
RETURNS uuid +
LANGUAGE c +
PARALLEL SAFE +
AS '$libdir/pgcrypto', $function$pg_random_uuid$function$+

(1 row)
~~~

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