-- =============================================
-- Education 模块 — 统一幂等表 回滚
-- Migration: 009 回滚
-- =============================================

DROP TABLE IF EXISTS education_idempotency;

-- Recreate the original split tables from 003 + 004 migrations if needed:
-- (restore from backup or re-run 003 and 004 DDL scripts)

-- Remove review_fingerprint column
ALTER TABLE education_practice_session
    DROP COLUMN IF EXISTS review_fingerprint;