Fix missing rollback.

crawlers/mooncrawl/mooncrawl/moonworm_crawler/historical_crawler.py

@@ -127,7 +127,7 @@ def historical_crawler(
             start_block = batch_end_block - 1
             failed_count = 0
         except Exception as e:
-
+            db_session.rollback()
             logger.error(f"Internal error: {e}")
             logger.exception(e)
             failed_count += 1