23 lines
936 B
SQL
23 lines
936 B
SQL
-- =============================================
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-- Education 模块 — 收藏夹 DDL Rollback
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-- Migration: 007
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-- =============================================
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-- IMPORTANT: This is a documentation-only rollback.
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-- No DROP/ALTER/DELETE statements are executed. The favorite
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-- table is provenance-safe: it only accumulates user preference
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-- data. Dropping this table would lose student favorites with
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-- no recovery path.
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--
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-- What this migration created:
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-- - education_favorite (new table)
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--
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-- Manual rollback requires:
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-- 1. Verified database backup before rollback
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-- 2. Operator approval (DBA sign-off)
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-- 3. Provenance of all favorite records preserved (exported)
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-- 4. Soft-delete via deleted = b'1' before any hard drop
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--
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-- These tables are NOT deleted by this script. Favorite history is
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-- retained; if deletion is required by external policy, consult
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-- the DBA for a verified rollback procedure.
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