Fix issues with the credits module by improving client-side debugging and database schema

Add client-side debugging scripts for JavaScript errors and unhandled promise rejections to aid in troubleshooting the credits module. Correct the production database schema for the 'avoirs' table by making 'invoice_reference' and 'amount' columns nullable, and include a test insertion to verify the fix.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 9fcf4b21-eb0c-4e53-a567-e2ce4a6ad869
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/9fcf4b21-eb0c-4e53-a567-e2ce4a6ad869/mpVybiP

debug_client_error.js

@@ -0,0 +1,45 @@
+// 🔍 DEBUG CLIENT-SIDE ERRORS
+// Ajoutez ce script dans la console de votre navigateur pour capturer les erreurs
+
+console.log('🔍 DEBUG AVOIRS - Initialisation...');
+
+// Intercepter les erreurs React
+window.addEventListener('error', (event) => {
+  console.error('🚨 ERREUR JAVASCRIPT:', {
+    message: event.message,
+    filename: event.filename,
+    lineno: event.lineno,
+    colno: event.colno,
+    error: event.error
+  });
+});
+
+// Intercepter les erreurs de Promise non gérées
+window.addEventListener('unhandledrejection', (event) => {
+  console.error('🚨 ERREUR PROMISE:', {
+    reason: event.reason,
+    promise: event.promise
+  });
+});
+
+// Tester l'accès direct à l'API
+fetch('/api/avoirs', { credentials: 'include' })
+  .then(response => response.json())
+  .then(data => {
+    console.log('✅ API TEST SUCCESS:', data);
+    console.log('📊 Nombre d\'avoirs:', data.length);
+    if (data.length > 0) {
+      console.log('📋 Premier avoir:', data[0]);
+      console.log('🔍 Structure:', {
+        hasInvoiceReference: data[0].invoiceReference !== undefined,
+        hasAmount: data[0].amount !== undefined,
+        invoiceRefType: typeof data[0].invoiceReference,
+        amountType: typeof data[0].amount
+      });
+    }
+  })
+  .catch(error => {
+    console.error('❌ API TEST ERROR:', error);
+  });
+
+console.log('🔍 DEBUG initialisé - surveillez les erreurs ci-dessus');