clean: clean python code

app.py

@@ -1,7 +1,7 @@
 import os
-import logging
 from flask import Flask, render_template
-from models import db, Assessment, Student, ClassGroup
+from models import db, ClassGroup
+from repositories import AssessmentRepository, StudentRepository
 from commands import init_db, create_large_test_data
 from app_config_classes import config
 from app_config import config_manager
@@ -52,9 +52,12 @@ def create_app(config_name=None):
     @app.route('/')
     def index():
         try:
-            recent_assessments = Assessment.query.order_by(Assessment.date.desc()).limit(5).all()
-            total_students = Student.query.count()
-            total_assessments = Assessment.query.count()
+            assessment_repo = AssessmentRepository()
+            student_repo = StudentRepository()
+            
+            recent_assessments = assessment_repo.find_recent(5)
+            total_students = student_repo.model_class.query.count()  # Keeping simple count
+            total_assessments = assessment_repo.model_class.query.count()  # Keeping simple count
             total_classes = ClassGroup.query.count()
             return render_template('index.html', 
                                  recent_assessments=recent_assessments,
@@ -78,10 +81,8 @@ def create_app(config_name=None):
     def students():
         try:
             # Optimisation: utiliser joinedload pour éviter les requêtes N+1
-            from sqlalchemy.orm import joinedload
-            students = Student.query.options(joinedload(Student.class_group)).order_by(
-                ClassGroup.name, Student.last_name, Student.first_name
-            ).join(ClassGroup).all()
+            student_repo = StudentRepository()
+            students = student_repo.find_all_with_class_ordered()
             return render_template('students.html', students=students)
         except Exception as e:
             app.logger.error(f'Erreur lors du chargement des étudiants: {e}')