Add thanks note and use uuid_nil()

content/posts/2024-03-07-upsert-uuids-with-sqlc.md

@@ -82,7 +82,7 @@ So how do we perform upserts that account for the zero-value of our types? I've
 CREATE OR REPLACE FUNCTION public.uuid_if_empty(id uuid) RETURNS uuid 
     LANGUAGE plpgsql
     AS $$BEGIN 
-        IF id = '00000000-0000-0000-0000-000000000000' THEN
+        IF id = uuid_nil() THEN 
             RETURN uuid_generate_v4();
         ELSE 
             RETURN id;
@@ -90,6 +90,8 @@ CREATE OR REPLACE FUNCTION public.uuid_if_empty(id uuid) RETURNS uuid
     END$$;
 ```
 
+> Thanks to [mariusor](https://lobste.rs/~mariusor) on lobste.rs for notifying me about `uuid_nil()`
+
 Now in our upsert statement, we use our new function instead of the raw value passed in
 
 ```sql