Refactor routes for better readability

**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 route handling and store-related error paths mentioned in the issue, then read how their current messages are produced. Define the needed descriptive messages from the existing behavior and verify that the updated errors improve debugging without changing unrelated behavior.

Written by the indexing model from the issue text.