feat(education): project and review wrong questions

sql/mysql/education/005-education-wrong-question-rollback.sql

@@ -0,0 +1,25 @@
+-- =============================================
+-- Education 模块 — 错题本 DDL Rollback
+-- Migration: 005
+-- =============================================
+-- IMPORTANT: This is a documentation-only rollback.
+--   No DROP/ALTER/DELETE statements are executed. The wrong_question
+--   table is provenance-safe: it only accumulates data and mastering
+--   is a status flag. Dropping these tables would lose student error
+--   history with no recovery path.
+--
+-- What this migration created:
+--   - education_wrong_question            (new table)
+--   - education_wrong_question_idempotency (new table)
+--   - education_practice_report_detail.options (new column)
+--   - education_practice_session.review_fingerprint (new column)
+--
+-- Manual rollback requires:
+--   1. Verified database backup before rollback
+--   2. Operator approval (DBA sign-off)
+--   3. Provenance of all wrong-question records preserved (exported)
+--   4. Soft-delete via deleted = b'1' before any hard drop
+--
+-- These tables are NOT deleted by this script. Wrong history is
+-- retained; if deletion is required by external policy, consult
+-- the DBA for a verified rollback procedure.