From d147228d83e5eadf1901771a5fe26b927a5faad1 Mon Sep 17 00:00:00 2001
From: Andy Salnikov <salnikov@slac.stanford.edu>
Date: Tue, 17 Oct 2023 11:55:34 -0700
Subject: [PATCH] Use slots flag with datastore records dataclasses

---
 python/lsst/daf/butler/datastore/stored_file_info.py   | 4 +---
 python/lsst/daf/butler/datastores/inMemoryDatastore.py | 4 +---
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/python/lsst/daf/butler/datastore/stored_file_info.py b/python/lsst/daf/butler/datastore/stored_file_info.py
index 40ed1d663c..f00cbe4a87 100644
--- a/python/lsst/daf/butler/datastore/stored_file_info.py
+++ b/python/lsst/daf/butler/datastore/stored_file_info.py
@@ -170,12 +170,10 @@ def from_records(
         return [klass.from_record(record) for record in records]
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class StoredFileInfo(StoredDatastoreItemInfo):
     """Datastore-private metadata associated with a Datastore file."""
 
-    __slots__ = {"formatter", "path", "storageClass", "component", "checksum", "file_size"}
-
     storageClassFactory = StorageClassFactory()
 
     def __init__(
diff --git a/python/lsst/daf/butler/datastores/inMemoryDatastore.py b/python/lsst/daf/butler/datastores/inMemoryDatastore.py
index 66ec3cf938..6aa9474e0d 100644
--- a/python/lsst/daf/butler/datastores/inMemoryDatastore.py
+++ b/python/lsst/daf/butler/datastores/inMemoryDatastore.py
@@ -54,14 +54,12 @@
 log = logging.getLogger(__name__)
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class StoredMemoryItemInfo(StoredDatastoreItemInfo):
     """Internal InMemoryDatastore Metadata associated with a stored
     DatasetRef.
     """
 
-    __slots__ = {"timestamp", "storageClass", "parentID"}
-
     timestamp: float
     """Unix timestamp indicating the time the dataset was stored."""