fix: PostgreSQL insert compatibility issues

- Fix event creation failing with 'not iterable' error
- Add .returning('id') to insert queries for PostgreSQL
- Handle both PostgreSQL (returns objects) and SQLite (returns IDs)
- Add missing fields to email_queue insert

This fixes the 500 error when creating new events in production.

backend/src/routes/adminCategories.js

@@ -77,12 +77,14 @@ router.post('/', adminAuth, [
     }
     
     // Create category
-    const [categoryId] = await db('photo_categories').insert({
+    const insertResult = await db('photo_categories').insert({
       name,
       slug: categorySlug,
       is_global,
       event_id: is_global ? null : event_id
-    });
+    }).returning('id');
+    
+    const categoryId = insertResult[0]?.id || insertResult[0];
     
     const category = await db('photo_categories').where('id', categoryId).first();
     

backend/src/routes/adminEvents.js

@@ -92,7 +92,7 @@ router.post('/', adminAuth, [
     await fs.mkdir(path.join(eventPath, 'individual'), { recursive: true });
     
     // Insert into database
-    const [eventId] = await db('events').insert({
+    const insertResult = await db('events').insert({
       slug,
       event_type,
       event_name,
@@ -108,7 +108,10 @@ router.post('/', adminAuth, [
       created_at: new Date().toISOString(),
       allow_user_uploads,
       upload_category_id
-    });
+    }).returning('id');
+    
+    // Handle both PostgreSQL (returns array of objects) and SQLite (returns array of IDs)
+    const eventId = insertResult[0]?.id || insertResult[0];
     
     // Log activity
     await logActivity('event_created', 
@@ -133,7 +136,9 @@ router.post('/', adminAuth, [
         gallery_password: password,
         expiry_date: await formatDate(expires_at, emailLang),
         welcome_message: welcome_message || ''
-      })
+      }),
+      status: 'pending',
+      created_at: new Date()
       // scheduled_at will use default value
     });