Server: Categorize functions

Redis/Service functions declared as STATIC to avoid unneded calls
but it's really questionable if they trully are

server/extension/sql/30_admin0.sql

@@ -32,7 +32,7 @@ RETURNS Geometry AS $$
       raise Exception('Error trying to geocode admin0 polygon')
     finally:
       quota_service.increment_total_service_use()
-$$ LANGUAGE plpythonu;
+$$ LANGUAGE plpythonu STABLE PARALLEL RESTRICTED;
 
 
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@@ -52,4 +52,4 @@ RETURNS Geometry AS $$
 
     RETURN ret;
   END
-$$ LANGUAGE plpgsql;
+$$ LANGUAGE plpgsql STABLE PARALLEL SAFE;