Optimize store for large datasets

**Description**
Currently middleware lacks proper timeout support.

**Proposed solution**
Add configurable timeout with sensible defaults.

**Priority**: Low/Medium

Start by locating the middleware and store implementation referenced by the issue, then trace how requests currently handle timeouts. Define the configurable timeout and its sensible default, and verify that the middleware applies it consistently without disrupting large-dataset handling.

Written by the indexing model from the issue text.