Optimize data for large datasets

**Description**
Currently store lacks proper import support.

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

**Priority**: Low/Medium

No file, test, or entry point is named. Start by locating the store implementation and any existing data-loading paths, then clarify supported import formats, configuration options, defaults, and validation expectations. Done means the store can import large datasets using configurable settings with sensible defaults, backed by tests.

Written by the indexing model from the issue text.