fix(audit): centraliser l'horloge UTC

app/models/availability/base.py

@@ -1,8 +1,7 @@
 """Abstract base class for availability models (PlayerDisponibility + CoachAvailability)."""
 
-from datetime import datetime
-
 from app.extensions import db
+from app.time_utils import utc_now_naive
 
 
 class BaseAvailability(db.Model):
@@ -13,5 +12,5 @@ class BaseAvailability(db.Model):
     day_of_week = db.Column(db.Integer, nullable=False)
     start_time = db.Column(db.Time, nullable=False)
     end_time = db.Column(db.Time, nullable=False)
-    created_at = db.Column(db.DateTime, default=datetime.utcnow)
-    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    created_at = db.Column(db.DateTime, default=utc_now_naive)
+    updated_at = db.Column(db.DateTime, default=utc_now_naive, onupdate=utc_now_naive)