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+# DIAGNOSTIC PRODUCTION - Erreurs 500 Annonces
+
+## Script de test à exécuter sur votre serveur
+
+### 1. Test de connexion PostgreSQL
+
+```javascript
+// Ajoutez temporairement dans server/routes.ts après la ligne 50
+app.get('/api/debug/db-connection', async (req, res) => {
+  try {
+    console.log('🔍 Testing PostgreSQL connection...');
+    const result = await db.select().from(dashboardMessages).limit(1);
+    console.log('✅ DB Connection OK, sample result:', result);
+    res.json({ status: 'ok', connection: 'success', sampleData: result });
+  } catch (error) {
+    console.error('❌ DB Connection Error:', error);
+    res.status(500).json({ status: 'error', error: error.message });
+  }
+});
+```
+
+### 2. Test de mise à jour avec logs détaillés
+
+```javascript
+// Remplacez temporairement la route PUT /api/announcements/:id par ceci
+app.put('/api/announcements/:id', isAuthenticated, async (req: any, res) => {
+  console.log('🔍 [DEBUG] Starting announcement update process');
+  console.log('🔍 [DEBUG] Request params:', req.params);
+  console.log('🔍 [DEBUG] Request body:', req.body);
+  console.log('🔍 [DEBUG] User:', req.user);
+  
+  try {
+    const userId = req.user.claims ? req.user.claims.sub : req.user.id;
+    console.log('🔍 [DEBUG] Extracted userId:', userId);
+    
+    const user = await storage.getUserWithGroups(userId);
+    console.log('🔍 [DEBUG] User found:', user ? 'YES' : 'NO');
+    if (user) {
+      console.log('🔍 [DEBUG] User details:', { id: user.id, username: user.username, role: user.role });
+    }
+
+    if (!user) {
+      console.error('❌ [DEBUG] User not found');
+      return res.status(404).json({ message: "User not found" });
+    }
+
+    if (user.role !== 'admin') {
+      console.error('❌ [DEBUG] Access denied - user role:', user.role);
+      return res.status(403).json({ message: "Only administrators can edit announcements" });
+    }
+
+    const id = parseInt(req.params.id);
+    console.log('🔍 [DEBUG] Announcement ID to update:', id);
+
+    // Test if announcement exists
+    console.log('🔍 [DEBUG] Checking if announcement exists...');
+    const existingAnnouncement = await storage.getAnnouncement(id);
+    console.log('🔍 [DEBUG] Existing announcement:', existingAnnouncement ? 'FOUND' : 'NOT FOUND');
+    if (existingAnnouncement) {
+      console.log('🔍 [DEBUG] Existing announcement details:', {
+        id: existingAnnouncement.id,
+        title: existingAnnouncement.title,
+        createdBy: existingAnnouncement.createdBy
+      });
+    }
+
+    if (!existingAnnouncement) {
+      console.error('❌ [DEBUG] Announcement not found:', id);
+      return res.status(404).json({ message: "Announcement not found" });
+    }
+
+    console.log('🔍 [DEBUG] Validating request data...');
+    const announcementData = insertAnnouncementSchema.partial().parse(req.body);
+    console.log('🔍 [DEBUG] Validated data:', announcementData);
+
+    console.log('🔍 [DEBUG] Calling storage.updateAnnouncement...');
+    const updatedAnnouncement = await storage.updateAnnouncement(id, announcementData);
+    console.log('✅ [DEBUG] Update successful:', updatedAnnouncement);
+    
+    res.json(updatedAnnouncement);
+  } catch (error) {
+    console.error('❌ [DEBUG] Error in update process:', error);
+    console.error('❌ [DEBUG] Error stack:', error.stack);
+    
+    if (error instanceof z.ZodError) {
+      console.error('❌ [DEBUG] Validation errors:', error.errors);
+      return res.status(400).json({ message: "Validation error", errors: error.errors });
+    }
+    
+    res.status(500).json({ 
+      message: "Failed to update announcement",
+      error: error.message,
+      debug: true
+    });
+  }
+});
+```
+
+### 3. Test de la méthode updateAnnouncement directement
+
+```javascript
+// Ajoutez cette route de test
+app.post('/api/debug/test-update', isAuthenticated, async (req: any, res) => {
+  try {
+    console.log('🔍 [DEBUG] Direct update test');
+    
+    // Test direct sur la base de données
+    const testResult = await db
+      .update(dashboardMessages)
+      .set({ title: 'Test Update ' + new Date().toISOString() })
+      .where(eq(dashboardMessages.id, 1))
+      .returning();
+      
+    console.log('✅ [DEBUG] Direct DB update result:', testResult);
+    res.json({ status: 'success', result: testResult });
+  } catch (error) {
+    console.error('❌ [DEBUG] Direct update error:', error);
+    res.status(500).json({ status: 'error', error: error.message });
+  }
+});
+```
+
+## Instructions d'utilisation
+
+1. **Ajoutez ces routes de debug** à votre serveur de production
+2. **Redémarrez le serveur**
+3. **Testez dans l'ordre** :
+   - GET `/api/debug/db-connection`
+   - POST `/api/debug/test-update`
+   - PUT `/api/announcements/1` avec les nouveaux logs
+4. **Envoyez-moi les logs complets** de ces tests
+
+## Vérifications supplémentaires
+
+### Vérifiez que les tables existent :
+```sql
+SELECT table_name FROM information_schema.tables 
+WHERE table_schema = 'public' AND table_name = 'dashboard_messages';
+
+SELECT column_name, data_type FROM information_schema.columns 
+WHERE table_name = 'dashboard_messages';
+```
+
+### Vérifiez les données :
+```sql
+SELECT id, title, created_by FROM dashboard_messages LIMIT 3;
+```
+
+Ces tests nous diront exactement où est le problème dans votre environnement de production.
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