33 lines
1.6 KiB
SQL
33 lines
1.6 KiB
SQL
-- =============================================
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-- Education 模块 — 练习会话与题目快照回滚
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-- Ticket #6 / Migration 002
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-- =============================================
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--
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-- WARNING: This file contains NO executable SQL.
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-- Destructive rollback (DROP TABLE) requires manual operator verification.
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--
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-- Manual rollback procedure (operator must execute):
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-- 1. Verify no other tables depend on these tables:
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-- SELECT tc.table_name, kcu.column_name, ccu.table_name AS referenced_table
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-- FROM information_schema.table_constraints tc
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-- JOIN information_schema.key_column_usage kcu
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-- ON tc.constraint_name = kcu.constraint_name
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-- JOIN information_schema.constraint_column_usage ccu
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-- ON tc.constraint_name = ccu.constraint_name
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-- WHERE tc.constraint_type = 'FOREIGN KEY'
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-- AND ccu.table_name IN ('education_practice_session', 'education_practice_question');
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-- Result MUST be empty before proceeding.
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--
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-- 2. Verify the tables contain only data from this migration:
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-- SELECT COUNT(*) AS session_count FROM education_practice_session;
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-- SELECT COUNT(*) AS question_count FROM education_practice_question;
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-- Operator must confirm these counts are acceptable to destroy.
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--
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-- 3. After verification, execute:
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-- DROP TABLE IF EXISTS education_practice_question;
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-- DROP TABLE IF EXISTS education_practice_session;
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--
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-- DO NOT uncomment or execute the lines below without operator verification.
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-- -- DROP TABLE IF EXISTS education_practice_question;
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-- -- DROP TABLE IF EXISTS education_practice_session;
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