-- Phase 4 deferred assessment columns. Do not DROP. Do not add passed/grade.
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ALTER TABLE `ai_task_step`
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ADD COLUMN `expected_text` TEXT NULL COMMENT '范读原文（txt 契约，非 SD 路径）' AFTER `prompt_text`,
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ADD COLUMN `metrics` JSON NULL COMMENT '定量指标 [{method,value}]' AFTER `audio_id`,
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ADD COLUMN `assessed_at` BIGINT NULL COMMENT '后评估完成 epoch ms' AFTER `metrics`;
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