Optimize config for large datasets

**Problem**
When working with services, 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 configuration handling and service error paths, then clarify which large-dataset configuration and error messages are in scope. Done means the requested configuration works for large datasets and the affected errors provide the agreed diagnostic detail.

Written by the indexing model from the issue text.