diff --git a/api/v2/user_service.go b/api/v2/user_service.go
index ae1d9483..1e65af5b 100644
--- a/api/v2/user_service.go
+++ b/api/v2/user_service.go
@@ -162,8 +162,8 @@ func (s *UserService) ListUserAccessTokens(ctx context.Context, request *apiv2pb
 	}
 
 	// Sort by issued time in descending order.
-	slices.SortFunc(accessTokens, func(i, j *apiv2pb.UserAccessToken) bool {
-		return i.IssuedAt.Seconds > j.IssuedAt.Seconds
+	slices.SortFunc(accessTokens, func(i, j *apiv2pb.UserAccessToken) int {
+		return int(i.IssuedAt.Seconds - j.IssuedAt.Seconds)
 	})
 	response := &apiv2pb.ListUserAccessTokensResponse{
 		AccessTokens: accessTokens,
diff --git a/proto/store/activity.proto b/proto/store/activity.proto
new file mode 100644
index 00000000..1e4ab177
--- /dev/null
+++ b/proto/store/activity.proto
@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package memos.store;
+
+option go_package = "gen/store";
+
+message ActivityMemoCommentCreatePayload {
+  int32 memo_id = 1;
+  int32 user_id = 2;
+  int32 
+}