Improve api 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 and API error-handling entry points; the issue names no files, tests, or commands to run. Clarify which errors need richer messages and define the expected wording and tests before considering the work done.

Written by the indexing model from the issue text.