diff --git a/vulnerabilities/data_source.py b/vulnerabilities/data_source.py
index 05928a460..ca68d1b83 100644
--- a/vulnerabilities/data_source.py
+++ b/vulnerabilities/data_source.py
@@ -75,7 +75,7 @@ class InvalidConfigurationError(Exception):
 
 @dataclasses.dataclass
 class DataSourceConfiguration:
-    batch_size: int
+    pass
 
 
 class DataSource(ContextManager):
@@ -105,8 +105,9 @@ def __init__(
         :param config: Optional dictionary with subclass-specific configuration
         """
         config = config or {}
+        self.batch_size = batch_size
         try:
-            self.config = self.__class__.CONFIG_CLASS(batch_size, **config)
+            self.config = self.__class__.CONFIG_CLASS(**config)
             # These really should be declared in DataSourceConfiguration above but that would
             # prevent DataSource subclasses from declaring mandatory parameters (i.e. positional
             # arguments)
@@ -183,7 +184,7 @@ def batch_advisories(self, advisories: List[Advisory]) -> Set[Advisory]:
         advisories = advisories[:]  # copy the list as we are mutating it in the loop below
 
         while advisories:
-            b, advisories = advisories[:self.config.batch_size], advisories[self.config.batch_size:]
+            b, advisories = advisories[:self.batch_size], advisories[self.batch_size:]
             yield set(b)
 
 
diff --git a/vulnerabilities/import_runner.py b/vulnerabilities/import_runner.py
index c8176d1b5..9b049fd3d 100644
--- a/vulnerabilities/import_runner.py
+++ b/vulnerabilities/import_runner.py
@@ -21,6 +21,7 @@
 #  VulnerableCode is a free software code scanning tool from nexB Inc. and others.
 #  Visit https://github.com/nexB/vulnerablecode/ for support and download.
 
+import dataclasses
 import datetime
 import logging
 from typing import Dict
@@ -77,6 +78,7 @@ def run(self, cutoff_date: datetime.datetime = None) -> None:
             _process_updated_advisories(data_source)
 
         self.importer.last_run = datetime.datetime.now(tz=datetime.timezone.utc)
+        self.importer.data_source_cfg = dataclasses.asdict(data_source.config)
         self.importer.save()
 
         logger.debug(f'Successfully finished import for {self.importer.name}.')
diff --git a/vulnerabilities/importers/rust.py b/vulnerabilities/importers/rust.py
index 6c085a899..dc5ac2e42 100644
--- a/vulnerabilities/importers/rust.py
+++ b/vulnerabilities/importers/rust.py
@@ -64,7 +64,7 @@ def _load_advisories(self, files) -> Set[Advisory]:
         files = [f for f in files if not f.endswith('-0000.toml')]  # skip temporary files
 
         while files:
-            batch, files = files[:self.config.batch_size], files[self.config.batch_size:]
+            batch, files = files[:self.batch_size], files[self.batch_size:]
 
             advisories = set()
 
diff --git a/vulnerabilities/tests/test_import_runner.py b/vulnerabilities/tests/test_import_runner.py
index 44b1dd897..ce5572c8b 100644
--- a/vulnerabilities/tests/test_import_runner.py
+++ b/vulnerabilities/tests/test_import_runner.py
@@ -46,7 +46,7 @@ def updated_advisories(self):
 
     def _yield_advisories(self, advisories):
         while advisories:
-            b, advisories = advisories[:self.config.batch_size], advisories[self.config.batch_size:]
+            b, advisories = advisories[:self.batch_size], advisories[self.batch_size:]
             yield b