Improve data performance

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

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

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

The issue names no files, tests, or entry points. Start by locating the API error-handling path and reviewing its existing messages; done means the relevant errors provide more descriptive debugging context and the affected behavior is covered by appropriate tests.

Written by the indexing model from the issue text.