fix: complete email template and CMS page fixes for production

- Fix email templates list endpoint to handle both schema variations
- Add migration for default CMS pages with language-specific columns
- Create debug script to identify 500 error causes
- Update CMS migration to use correct column names (title_en/de, content_en/de)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/scripts/debug-500-errors.js

@@ -0,0 +1,92 @@
+require('dotenv').config();
+const { db } = require('../src/database/db');
+
+async function debugEndpoints() {
+  console.log('Debugging 500 errors...\n');
+  
+  try {
+    // Test email templates query
+    console.log('1. Testing email templates query:');
+    try {
+      const templates = await db('email_templates')
+        .select('*')
+        .orderBy('template_key');
+      
+      console.log(`Found ${templates.length} templates`);
+      if (templates.length > 0) {
+        console.log('First template columns:', Object.keys(templates[0]));
+        console.log('Template keys:', templates.map(t => t.template_key));
+      }
+    } catch (error) {
+      console.error('Email templates query failed:', error.message);
+      console.error('Error code:', error.code);
+    }
+    
+    // Test notifications query
+    console.log('\n2. Testing notifications query:');
+    try {
+      const notifications = await db('activity_logs')
+        .select(
+          'activity_logs.*',
+          'events.event_name'
+        )
+        .leftJoin('events', 'activity_logs.event_id', 'events.id')
+        .whereNull('activity_logs.read_at')
+        .orderBy('activity_logs.created_at', 'desc')
+        .limit(5);
+      
+      console.log(`Found ${notifications.length} unread notifications`);
+    } catch (error) {
+      console.error('Notifications query failed:', error.message);
+      console.error('Error code:', error.code);
+      
+      // Check if it's a column issue
+      if (error.message.includes('column')) {
+        console.log('\nChecking activity_logs columns:');
+        const columns = await db('activity_logs').columnInfo();
+        console.log('Columns:', Object.keys(columns));
+      }
+    }
+    
+    // Test specific template query
+    console.log('\n3. Testing specific template query (gallery_created):');
+    try {
+      const template = await db('email_templates')
+        .where('template_key', 'gallery_created')
+        .first();
+      
+      if (template) {
+        console.log('Template found:', template.template_key);
+        console.log('Has subject_en?', template.subject_en !== undefined);
+        console.log('Has subject?', template.subject !== undefined);
+      } else {
+        console.log('Template not found');
+      }
+    } catch (error) {
+      console.error('Template query failed:', error.message);
+    }
+    
+    // Check CMS pages
+    console.log('\n4. Checking CMS pages:');
+    try {
+      const pages = await db('cms_pages')
+        .select('slug', 'title', 'is_published')
+        .orderBy('slug');
+      
+      console.log(`Found ${pages.length} CMS pages:`);
+      pages.forEach(page => {
+        console.log(`  - ${page.slug}: ${page.title} (published: ${page.is_published})`);
+      });
+    } catch (error) {
+      console.error('CMS pages query failed:', error.message);
+    }
+    
+  } catch (error) {
+    console.error('General error:', error);
+  } finally {
+    await db.destroy();
+    process.exit(0);
+  }
+}
+
+debugEndpoints();