Optimize validation for large datasets

**Problem**
When working with store, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

Start by locating the validation and store-related error-handling entry points in the repository. Review how current errors are produced and identify which details are missing for large datasets. Done means the relevant failures emit more descriptive messages and existing validation behavior remains intact.

Written by the indexing model from the issue text.