Approve timeline integration plan

src/lib/entitySubmissionHelpers.ts

@@ -1081,3 +1081,52 @@ export async function submitTimelineEventUpdate(
     submissionId: submission.id,
   };
 }
+
+/**
+ * Delete a timeline event (only pending/own events)
+ * @param eventId - Timeline event ID
+ * @param userId - Current user ID
+ * @throws Error if event not found or cannot be deleted
+ */
+export async function deleteTimelineEvent(
+  eventId: string,
+  userId: string
+): Promise<void> {
+  // First verify the event exists and user has permission
+  const { data: event, error: fetchError } = await supabase
+    .from('entity_timeline_events')
+    .select('created_by, approved_by')
+    .eq('id', eventId)
+    .single();
+
+  if (fetchError) {
+    console.error('Error fetching timeline event:', fetchError);
+    throw new Error('Timeline event not found');
+  }
+
+  if (!event) {
+    throw new Error('Timeline event not found');
+  }
+
+  // Only allow deletion of own unapproved events
+  if (event.created_by !== userId) {
+    throw new Error('You can only delete your own timeline events');
+  }
+
+  if (event.approved_by !== null) {
+    throw new Error('Cannot delete approved timeline events');
+  }
+
+  // Delete the event
+  const { error: deleteError } = await supabase
+    .from('entity_timeline_events')
+    .delete()
+    .eq('id', eventId);
+
+  if (deleteError) {
+    console.error('Error deleting timeline event:', deleteError);
+    throw new Error('Failed to delete timeline event');
+  }
+
+  console.log('✅ Timeline event deleted:', eventId);
+}