fix contract

app/routes/main.py

@@ -1,4 +1,4 @@
-from flask import Blueprint, render_template, jsonify, redirect, url_for, session, request
+from flask import Blueprint, render_template, jsonify, redirect, url_for, session, request, flash
 from flask_login import login_required, current_user
 from app.models.reservation import Reservation
 from app.models.classroom import Classroom
@@ -112,7 +112,7 @@ def dashboard_stats_api():
 @login_required
 def genetic_optimizer():
     """Serve the genetic algorithm optimization interface"""
-    if current_user.role not in ['admin', 'teacher']:
+    if current_user.role not in ['ADMIN']:
         flash('You do not have permission to access the optimization tool.', 'danger')
         return redirect(url_for('main.dashboard'))