Improve helpers performance

**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 store helpers and reading their current error paths. Reproduce the reported errors and identify which cases lack useful context. Done means the relevant failures produce more descriptive messages and the existing behavior remains covered by tests, though no test file is named in the issue.

Written by the indexing model from the issue text.