diff --git a/scripts/pb-add-dn-batches.py b/scripts/pb-add-dn-batches.py
index 98cfbf7..a440144 100755
--- a/scripts/pb-add-dn-batches.py
+++ b/scripts/pb-add-dn-batches.py
@@ -133,6 +133,19 @@ def main():
         {"name": "page_to", "type": "number", "required": False},
     ])
 
+    # Repair the standard system date fields on both new collections
+    # if they were created before this script knew to include them. The
+    # `create_collection` path only fires for from-scratch creates;
+    # add_fields is the path that heals an existing live collection.
+    add_fields(token, "dn_batches", [
+        {"name": "created", "type": "date", "required": False, "onCreate": True},
+        {"name": "updated", "type": "date", "required": False, "onCreate": True, "onUpdate": True},
+    ])
+    add_fields(token, "dn_batch_notes", [
+        {"name": "created", "type": "date", "required": False, "onCreate": True},
+        {"name": "updated", "type": "date", "required": False, "onCreate": True, "onUpdate": True},
+    ])
+
 
 if __name__ == "__main__":
     main()