A run_artifact row is keyed by the message the bytes left on, and that was also the only name it could answer with — so an `@run:` reference resolved through the row was the same bytes under a name its producer never chose. The row now records the file name beside the message name; rows written before the column answer as they always did. The fallback also checks the bytes are still in the store, which the bare digest spelling beside it has always done. A missing blob now fails at submit rather than in the middle of the run that wanted it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Generic single-database configuration.