Add user preferences

config/sql/users.sql

@@ -9,6 +9,7 @@ CREATE TABLE public.users
     notifications text[] COLLATE pg_catalog."default",
     subscriptions text[] COLLATE pg_catalog."default",
     email text COLLATE pg_catalog."default" NOT NULL,
+    preferences text COLLAGE pg_catalog."default",
     CONSTRAINT users_email_key UNIQUE (email),
     CONSTRAINT users_id_key UNIQUE (id)
 )