Add unit tests for store

**Feature request**
It would be great to have filtering for types.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_filtering` with default `false`.

Start by locating the store implementation and its existing unit tests. Read how configuration options are defined and how stored types are handled; done means adding coverage for type filtering and confirming that enable_filtering defaults to false.

Written by the indexing model from the issue text.