diff --git a/src/components/timeline/TimelineEventEditorDialog.tsx b/src/components/timeline/TimelineEventEditorDialog.tsx
index d63cef60..9135b20f 100644
--- a/src/components/timeline/TimelineEventEditorDialog.tsx
+++ b/src/components/timeline/TimelineEventEditorDialog.tsx
@@ -48,6 +48,7 @@ const timelineEventSchema = z.object({
     'owner_change',
     'location_change',
     'status_change',
+    'opening',
     'closure',
     'reopening',
     'renovation',
@@ -205,20 +206,21 @@ export function TimelineEventEditorDialog({
                         <SelectValue placeholder="Select event type" />
                       </SelectTrigger>
                     </FormControl>
-                    <SelectContent>
-                      <SelectItem value="name_change">Name Change</SelectItem>
-                      <SelectItem value="operator_change">Operator Change</SelectItem>
-                      <SelectItem value="owner_change">Ownership Change</SelectItem>
-                      <SelectItem value="location_change">Relocation</SelectItem>
-                      <SelectItem value="status_change">Status Change</SelectItem>
-                      <SelectItem value="closure">Closure</SelectItem>
-                      <SelectItem value="reopening">Reopening</SelectItem>
-                      <SelectItem value="renovation">Renovation</SelectItem>
-                      <SelectItem value="expansion">Expansion</SelectItem>
-                      <SelectItem value="acquisition">Acquisition</SelectItem>
-                      <SelectItem value="milestone">Milestone</SelectItem>
-                      <SelectItem value="other">Other</SelectItem>
-                    </SelectContent>
+                  <SelectContent>
+                    <SelectItem value="name_change">Name Change</SelectItem>
+                    <SelectItem value="operator_change">Operator Change</SelectItem>
+                    <SelectItem value="owner_change">Ownership Change</SelectItem>
+                    <SelectItem value="location_change">Relocation</SelectItem>
+                    <SelectItem value="status_change">Status Change</SelectItem>
+                    <SelectItem value="opening">Opening</SelectItem>
+                    <SelectItem value="closure">Closure</SelectItem>
+                    <SelectItem value="reopening">Reopening</SelectItem>
+                    <SelectItem value="renovation">Renovation</SelectItem>
+                    <SelectItem value="expansion">Expansion</SelectItem>
+                    <SelectItem value="acquisition">Acquisition</SelectItem>
+                    <SelectItem value="milestone">Milestone</SelectItem>
+                    <SelectItem value="other">Other</SelectItem>
+                  </SelectContent>
                   </Select>
                   <FormMessage />
                 </FormItem>
diff --git a/src/types/timeline.ts b/src/types/timeline.ts
index fbe23c1c..86e405a0 100644
--- a/src/types/timeline.ts
+++ b/src/types/timeline.ts
@@ -11,6 +11,7 @@ export type TimelineEventType =
   | 'owner_change'
   | 'location_change'
   | 'status_change'
+  | 'opening'
   | 'closure'
   | 'reopening'
   | 'renovation'
diff --git a/supabase/migrations/20251015193124_78cdb5b0-4100-4d78-b338-14e508a6df3b.sql b/supabase/migrations/20251015193124_78cdb5b0-4100-4d78-b338-14e508a6df3b.sql
new file mode 100644
index 00000000..ffc2dc37
--- /dev/null
+++ b/supabase/migrations/20251015193124_78cdb5b0-4100-4d78-b338-14e508a6df3b.sql
@@ -0,0 +1,21 @@
+-- Add 'opening' to timeline event types
+ALTER TABLE public.entity_timeline_events 
+DROP CONSTRAINT entity_timeline_events_event_type_check;
+
+ALTER TABLE public.entity_timeline_events 
+ADD CONSTRAINT entity_timeline_events_event_type_check 
+CHECK (event_type IN (
+  'name_change',
+  'operator_change',
+  'owner_change',
+  'location_change',
+  'status_change',
+  'opening',
+  'closure',
+  'reopening',
+  'renovation',
+  'expansion',
+  'acquisition',
+  'milestone',
+  'other'
+));
\ No newline at end of file