fix(audit): centraliser l'horloge UTC

app/models/contract.py

@@ -1,8 +1,7 @@
 """Contract documents for players to sign."""
 
-from datetime import datetime
-
 from app.extensions import db
+from app.time_utils import utc_now_naive
 
 
 class Contract(db.Model):
@@ -23,7 +22,7 @@ class Contract(db.Model):
 
     status = db.Column(db.String(20), default='pending')
     notes = db.Column(db.Text, nullable=True)
-    uploaded_at = db.Column(db.DateTime, default=datetime.utcnow)
+    uploaded_at = db.Column(db.DateTime, default=utc_now_naive)
     signed_at = db.Column(db.DateTime, nullable=True)
 
     player = db.relationship('User', foreign_keys=[player_id], backref='contracts')