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- revision '007_role_sys' → '007_role_system' - 008 的 down_revision 写的是 '007_role_system',但 007 实际是 '007_role_sys' - alembic upgrade head 报 KeyError: '007_role_system' - DB alembic_version 已记 007_role_system,改 007 对齐最干净 Co-Authored-By: Claude <noreply@anthropic.com>