Fix: Update is_moderator function

supabase/migrations/20250928234051_47e9ad4e-e44a-4707-94ab-0431b7ab8a41.sql

@@ -0,0 +1,14 @@
+-- Update is_moderator function to include superusers
+CREATE OR REPLACE FUNCTION public.is_moderator(_user_id uuid)
+ RETURNS boolean
+ LANGUAGE sql
+ STABLE SECURITY DEFINER
+ SET search_path TO 'public'
+AS $function$
+  SELECT EXISTS (
+    SELECT 1
+    FROM public.user_roles
+    WHERE user_id = _user_id
+      AND role IN ('moderator', 'admin', 'superuser')
+  )
+$function$;