**_{_{}} Keep schema commit from deleting NULL-generation artifacts**

[BigSimmo]

Keep schema commit from deleting NULL-generation artifacts

The migration function has the replacement-exists guard, but the schema snapshot still deletes any artifact row whose typed index_generation_id is NULL. Fresh schema rebuilds will therefore drop rows written by the current workers, which still populate the generation in metadata for artifact tables like document_images, immediately removing images and other enrichment artifacts during commit_document_index_generation.

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Originally posted by @chatgpt-codex-connector[bot] in #134 (comment)