(IMPORTANT) Errors epic: Make provider log optional on Evaluation Results

[andresgutgon]

What?

This is key in enabling error tracing in our evaluation results and document logs.

Warning

Errors can happen. But we still want to track the story of that failure in the same way. So we want to create failed evaluation results records with an error attached to it.

TODO

• Make provider_log_id field optional on evaluation_results
• Make sure evaluation results without provider logs are not used for agreggations
• Make sure evaluation results without resultable relation are used for aggregations