diff --git a/swh/vault/backend.py b/swh/vault/backend.py
index 3009cdd..8712302 100644
--- a/swh/vault/backend.py
+++ b/swh/vault/backend.py
@@ -5,6 +5,7 @@
 
 import collections
 from email.mime.text import MIMEText
+import logging
 import smtplib
 from typing import Any, Dict, List, Optional, Tuple
 
@@ -22,6 +23,9 @@ from swh.vault.cookers import COOKER_TYPES, get_cooker_cls
 from swh.vault.exc import NotFoundExc
 from swh.vault.interface import ObjectId
 
+# logging.basicConfig(level=logging.DEBUG)
+logger = logging.getLogger(__name__)
+
 cooking_task_name = "swh.vault.cooking_tasks.SWHCookingTask"
 
 NOTIF_EMAIL_FROM = '"Software Heritage Vault" ' "<bot@softwareheritage.org>"
@@ -74,6 +78,9 @@ class VaultBackend:
     """
 
     def __init__(self, **config):
+        logging.basicConfig(level=logging.DEBUG)
+        logger.debug("TEST debug")
+        logger.error("TEST error")
         self.config = config
         self.cache = VaultCache(**config["cache"])
         self.scheduler = get_scheduler(**config["scheduler"])
@@ -372,6 +379,7 @@ class VaultBackend:
         self, obj_type: str, obj_id: ObjectId, raise_notfound=True, db=None, cur=None
     ):
         """Retrieve a bundle from the cache"""
+        logger.debug("fetch")
         hex_id, obj_id = self._compute_ids(obj_id)
         available = self.is_available(obj_type, obj_id, cur=cur)
         if not available: