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#65 的 device 迁移链与 comparison_token_cols 都从 ceb286289426 分叉成双 head,alembic upgrade head 报 Multiple head revisions;加 merge 迁移 4dc2af7ebe74 合并(空 DDL 仅接链)。 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>