Update app.py

app.py

@@ -13,7 +13,8 @@ from database.db_manager import DatabaseManager
 from database.db_operations import adicionar_lote_questoes
 
 def main():
-    db = DatabaseManager()
+from database.db_manager import DatabaseManager
+    self.db = DatabaseManager()
     
     # Carrega questões do arquivo JSON
     with open('data/questoes_revalida.json', 'r', encoding='utf-8') as f: