Work on cryptokeys

sql/0008.sql

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+ALTER TABLE public.node ADD crypto_key_id int4 NULL;
+ALTER TABLE public.node ADD CONSTRAINT crypto_key_fk FOREIGN KEY (crypto_key_id) REFERENCES public.crypto_key(id) ON DELETE RESTRICT ON UPDATE RESTRICT;

sql/0009.sql

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+CREATE SEQUENCE aes_ccm_counter AS int8 INCREMENT BY 1 NO CYCLE;

sql/0010.sql

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+ALTER TABLE public.crypto_key ADD CONSTRAINT crypto_user_description_un UNIQUE (user_id, description);