msp: log when deleting stale msp accounts

portail_citoyen/apps/msp/models.py

@@ -1,5 +1,8 @@
 import requests
 import json
+import logging
+
+logger = logging.getLogger(__name__)
 
 from django.db import models
 from django.contrib.auth import get_user_model
@@ -29,6 +32,8 @@ class MspAccount(models.Model):
         new_token = response.json()
         if 'error' in new_token:
             if new_token['error'] == 'invalid_grant':
+                logger.warning('obsolete token %r, deleting MspAccount %r', self.token,
+                        self.agc)
                 self.delete()
                 return False
             return True