diff --git a/supabase/migrations/20251017225027_167ad8ec-6fd6-488a-9b02-fc690aee69a2.sql b/supabase/migrations/20251017225027_167ad8ec-6fd6-488a-9b02-fc690aee69a2.sql
new file mode 100644
index 00000000..c5bd80d5
--- /dev/null
+++ b/supabase/migrations/20251017225027_167ad8ec-6fd6-488a-9b02-fc690aee69a2.sql
@@ -0,0 +1,24 @@
+-- Add 'timeline_event' to submission_items item_type constraint
+ALTER TABLE public.submission_items 
+DROP CONSTRAINT IF EXISTS submission_items_item_type_check;
+
+ALTER TABLE public.submission_items 
+ADD CONSTRAINT submission_items_item_type_check 
+CHECK (item_type IN (
+  'park',
+  'ride',
+  'review',
+  'photo',
+  'ride_model',
+  'manufacturer',
+  'operator',
+  'designer',
+  'property_owner',
+  'photo_edit',
+  'photo_delete',
+  'milestone',
+  'timeline_event'
+));
+
+COMMENT ON CONSTRAINT submission_items_item_type_check ON public.submission_items IS 
+'Allowed item types: entities (park, ride, etc.), special ops (photo_edit, photo_delete), and events (milestone, timeline_event)';
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