Handle edge cases in caching

**Feature request**
It would be great to have timeout for store.

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

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

No files or tests are named. Start by locating the cache store implementation and configuration handling, then trace how stored values are created and read. Done means the requested timeout behavior and the default-false enable_timeout option are defined clearly and covered by relevant tests.

Written by the indexing model from the issue text.