diff --git a/align_data/db/models.py b/align_data/db/models.py
index e79da23..ce7e41d 100644
--- a/align_data/db/models.py
+++ b/align_data/db/models.py
@@ -14,7 +14,6 @@
     Enum,
     ForeignKey,
     String,
-    Boolean,
     Text,
     func,
     event,
diff --git a/align_data/embeddings/pinecone/update_pinecone.py b/align_data/embeddings/pinecone/update_pinecone.py
index 4e6ac03..6fa1064 100644
--- a/align_data/embeddings/pinecone/update_pinecone.py
+++ b/align_data/embeddings/pinecone/update_pinecone.py
@@ -76,7 +76,8 @@ def save_batch(self, session: Session, batch: List[Any]):
             session.rollback()
 
     def batch_entries(self, article_stream: Generator[Article, None, None]) -> Iterator[List[Article]]:
-        while batch := tuple(islice(article_stream, self.batch_size)):
+        items = iter(article_stream)
+        while batch := tuple(islice(items, self.batch_size)):
             yield list(batch)
 
 
@@ -104,7 +105,8 @@ def process_batch(self, batch: List[Tuple[Article, PineconeEntry | None]]):
     def batch_entries(
         self, article_stream: Generator[Article, None, None]
     ) -> Iterator[List[Tuple[Article, PineconeEntry | None]]]:
-        while batch := tuple(islice(article_stream, self.batch_size)):
+        items = iter(article_stream)
+        while batch := tuple(islice(items, self.batch_size)):
             yield [(article, self._make_pinecone_entry(article)) for article in batch]
 
     def _make_pinecone_entry(self, article: Article) -> PineconeEntry | None:
@@ -165,7 +167,7 @@ def _articles_by_id(self, session, ids: List[str], _force_update: bool):
 
     def process_batch(self, batch: List[Article]):
         self.pinecone_db.delete_entries([a.id for a in batch])
-        logger.info('removing batch %s', len(batch))
+        logger.info('removing batch of %s items', len(batch))
         for article in batch:
             article.pinecone_status = PineconeStatus.absent
         return batch