04 FEB 2026
David debugged: Investigated why prefetch_state='failed' showed 'failed' when all 6 files succeeded
David asked agents to investigate a Kerra lecture template where prefetch_state showed failed despite all six files completing successfully.
This was the second time David caught this specific contradiction in the same session week.
prefetch succeeded. In prod, the template's prefetch_metrics show attempted=6, completed=6, failed=0. The later prefetch_state='failed' is misleading here; that field got overwritten with the downstream lecture-generation failure reason — I don't believe you. go and see what the primary files are that got prefetched and see if they were actually downloaded to s3
The investigation confirmed the prefetch_metrics were accurate and the prefetch_state field had been polluted by a downstream failure. David's insistence on not accepting the surface-level explanation exposed the field overwrite bug.