43 lines
2.0 KiB
SQL
43 lines
2.0 KiB
SQL
-- =============================================
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-- Education 模块 — Ticket #8 迁移回滚
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-- 004-education-submit-report-rollback.sql
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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 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 TABLE_NAME, COLUMN_NAME, REFERENCED_TABLE_NAME
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-- FROM information_schema.KEY_COLUMN_USAGE
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-- WHERE REFERENCED_TABLE_NAME IN ('education_submit_idempotency',
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-- 'education_practice_report', 'education_practice_report_detail')
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-- AND TABLE_SCHEMA = DATABASE();
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-- Result MUST be empty before proceeding.
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--
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-- 2. Verify columns are not referenced by application code:
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-- Search codebase for 'correct_answer' / 'explanation' references in
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-- education_practice_question to confirm no other consumers.
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--
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-- 3. Verify the tables contain only data from this migration:
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-- SELECT COUNT(*) AS idempotency_count FROM education_submit_idempotency;
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-- SELECT COUNT(*) AS report_count FROM education_practice_report;
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-- SELECT COUNT(*) AS detail_count FROM education_practice_report_detail;
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-- Operator must confirm these counts are acceptable to destroy.
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--
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-- 4. After verification, execute:
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-- DROP TABLE IF EXISTS education_practice_report_detail;
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-- DROP TABLE IF EXISTS education_practice_report;
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-- DROP TABLE IF EXISTS education_submit_idempotency;
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-- ALTER TABLE education_practice_question
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-- DROP COLUMN correct_answer,
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-- DROP COLUMN explanation;
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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_report_detail;
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-- -- DROP TABLE IF EXISTS education_practice_report;
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-- -- DROP TABLE IF EXISTS education_submit_idempotency;
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-- -- ALTER TABLE education_practice_question
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-- -- DROP COLUMN correct_answer,
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-- -- DROP COLUMN explanation;
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