Linting

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

participation/models.py

@@ -8,7 +8,7 @@ from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.validators import MaxValueValidator, MinValueValidator, RegexValidator
 from django.db import models
-from django.db.models import F, Index, Q
+from django.db.models import Index
 from django.urls import reverse_lazy
 from django.utils import timezone
 from django.utils.crypto import get_random_string