The old autotags worked child -> parent (adding child_id pulled in parent_id,
per tfm__add_file_to_tag_recursive). The new tag_rules model is "when_tag
applied -> then_tag follows", so child must map to when_tag and parent to
then_tag. The transform had it reversed, so migrated rules never fired —
adding a tag added only itself.
Map child_id -> when_tag_id, parent_id -> then_tag_id. Verified on a scratch DB.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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