diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@
 requests
 setuptools
 xmltodict
+iso8601
diff --git a/swh/lister/bitbucket/lister.py b/swh/lister/bitbucket/lister.py
--- a/swh/lister/bitbucket/lister.py
+++ b/swh/lister/bitbucket/lister.py
@@ -3,11 +3,16 @@
 # See top-level LICENSE file for more information
 
 from urllib import parse
+import logging
+import iso8601
 
 from swh.lister.bitbucket.models import BitBucketModel
 from swh.lister.core.indexing_lister import SWHIndexingHttpLister
 
 
+logger = logging.getLogger(__name__)
+
+
 class BitBucketLister(SWHIndexingHttpLister):
     PATH_TEMPLATE = '/repositories?after=%s'
     MODEL = BitBucketModel
@@ -37,4 +42,32 @@
         return [self.get_model_from_repo(repo) for repo in repos]
 
     def request_uri(self, identifier):
+        if isinstance(identifier, list):
+            raise Exception(identifier)
         return super().request_uri(identifier or '1970-01-01')
+
+    def is_within_bounds(self, inner, lower=None, upper=None):
+        # values are expected to be str dates
+        try:
+            inner = iso8601.parse_date(inner)
+            if lower:
+                lower = iso8601.parse_date(lower)
+            if upper:
+                upper = iso8601.parse_date(upper)
+            if lower is None and upper is None:
+                return True
+            elif lower is None:
+                ret = inner <= upper
+            elif upper is None:
+                ret = inner >= lower
+            else:
+                ret = lower <= inner <= upper
+        except Exception as e:
+            logger.error(str(e) + ': %s, %s, %s' %
+                         (('inner=%s%s' % (type(inner), inner)),
+                          ('lower=%s%s' % (type(lower), lower)),
+                          ('upper=%s%s' % (type(upper), upper)))
+                         )
+            raise
+
+        return ret
diff --git a/swh/lister/core/indexing_lister.py b/swh/lister/core/indexing_lister.py
--- a/swh/lister/core/indexing_lister.py
+++ b/swh/lister/core/indexing_lister.py
@@ -112,6 +112,8 @@
             # indexable column from the ith row
             index = self.db_session.query(self.MODEL.indexable) \
                       .order_by(self.MODEL.indexable).offset(i).first()
+            if index:
+                index = index[0]
             if index is not None and prev_index is not None:
                 partitions.append((prev_index, index))
             prev_index = index
diff --git a/swh/lister/core/lister_base.py b/swh/lister/core/lister_base.py
--- a/swh/lister/core/lister_base.py
+++ b/swh/lister/core/lister_base.py
@@ -200,11 +200,11 @@
 
             self.string_pattern_check(inner, lower, upper)
         except Exception as e:
-            logging.error(str(e) + ': %s, %s, %s' %
-                          (('inner=%s%s' % (type(inner), inner)),
+            logger.error(str(e) + ': %s, %s, %s' %
+                         (('inner=%s%s' % (type(inner), inner)),
                           ('lower=%s%s' % (type(lower), lower)),
                           ('upper=%s%s' % (type(upper), upper)))
-                          )
+                         )
             raise
 
         return ret
@@ -249,7 +249,7 @@
 
     def __init__(self, override_config=None):
         self.backoff = self.INITIAL_BACKOFF
-        logging.debug('Loading config from %s' % self.CONFIG_BASE_FILENAME)
+        logger.debug('Loading config from %s' % self.CONFIG_BASE_FILENAME)
         self.config = self.parse_config_file(
             base_filename=self.CONFIG_BASE_FILENAME,
             additional_configs=[self.ADDITIONAL_CONFIG]
@@ -297,7 +297,7 @@
                 r = self.transport_request(identifier)
             except FetchError:
                 # network-level connection error, try again
-                logging.warning(
+                logger.warning(
                     'connection error on %s: sleep for %d seconds' %
                     (identifier, self.CONN_SLEEP))
                 time.sleep(self.CONN_SLEEP)
@@ -310,7 +310,7 @@
             # detect throttling
             must_retry, delay = self.transport_quota_check(r)
             if must_retry:
-                logging.warning(
+                logger.warning(
                     'rate limited on %s: sleep for %f seconds' %
                     (identifier, delay))
                 time.sleep(delay)
@@ -320,7 +320,7 @@
             retries_left -= 1
 
         if not retries_left:
-            logging.warning(
+            logger.warning(
                 'giving up on %s: max retries exceeded' % identifier)
 
         return r
@@ -438,7 +438,7 @@
                                re.escape(a))
             if (isinstance(b, str) and (re.match(a_pattern, b) is None)
                or isinstance(c, str) and (re.match(a_pattern, c) is None)):
-                logging.debug(a_pattern)
+                logger.debug(a_pattern)
                 raise TypeError('incomparable string patterns detected')
 
     def inject_repo_data_into_db(self, models_list):
diff --git a/swh/lister/core/lister_transports.py b/swh/lister/core/lister_transports.py
--- a/swh/lister/core/lister_transports.py
+++ b/swh/lister/core/lister_transports.py
@@ -7,6 +7,7 @@
 from datetime import datetime
 from email.utils import parsedate
 from pprint import pformat
+import logging
 
 import requests
 import xmltodict
@@ -20,6 +21,9 @@
 from .lister_base import FetchError
 
 
+logger = logging.getLogger(__name__)
+
+
 class SWHListerHttpTransport(abc.ABC):
     """Use the Requests library for making Lister endpoint requests.
 
@@ -114,6 +118,7 @@
             else:
                 response = self.session.get(path, **params)
         except requests.exceptions.ConnectionError as e:
+            logger.warning('Failed to fetch %s: %s', path, e)
             raise FetchError(e)
         else:
             if response.status_code not in self.EXPECTED_STATUS_CODES: