Update app.py

app.py

@@ -109,29 +109,35 @@ def load_last_7_days_stats():
         return pd.DataFrame()
 
 def load_dashboard_summary():
-    """Charge uniquement les métriques pour le dashboard (requête légère)"""
+    """Charge les métriques pour le dashboard (robuste à toutes versions SQLAlchemy)"""
     engine = get_db_connection()
     query = text("""
         SELECT 
             COUNT(*) as total_transactions,
-            SUM(CASE WHEN pred_is_fraud = 1 THEN 1 ELSE 0 END) as total_frauds,
-            SUM(CASE WHEN pred_is_fraud = 0 THEN 1 ELSE 0 END) as total_no_frauds,
-            SUM(CASE WHEN pred_is_fraud = 1 THEN amt ELSE 0 END) as total_fraud_amount
-        FROM fraud_predictions
+            COALESCE(SUM(CASE WHEN pred_is_fraud = 1 THEN 1 ELSE 0 END), 0) as total_frauds,
+            COALESCE(SUM(CASE WHEN pred_is_fraud = 0 THEN 1 ELSE 0 END), 0) as total_no_frauds,
+            COALESCE(SUM(CASE WHEN pred_is_fraud = 1 THEN amt ELSE 0 END), 0) as total_fraud_amount
+        FROM fraud_predictions;
     """)
-    
+
     try:
         with engine.connect() as conn:
-            result = conn.execute(query).fetchone()
+            result = conn.execute(query).mappings().first()  # ✅ renvoie un dict directement
+
+        if not result:
+            return {'total_frauds': 0, 'total_no_frauds': 0, 'total_fraud_amount': 0}
+
         return {
-            'total_frauds': result[1] or 0,
-            'total_no_frauds': result[2] or 0,
-            'total_fraud_amount': result[3] or 0
+            'total_frauds': result.get('total_frauds', 0),
+            'total_no_frauds': result.get('total_no_frauds', 0),
+            'total_fraud_amount': result.get('total_fraud_amount', 0)
         }
+
     except Exception as e:
         st.error(f"❌ Erreur lors du chargement du résumé: {e}")
         return {'total_frauds': 0, 'total_no_frauds': 0, 'total_fraud_amount': 0}
 
+
 # ========================== PAGE: DASHBOARD ==========================
 def page_dashboard():
     st.title("🕵🏻 Fraud Detection Dashboard")