主流程

migrations/0012_requirement_artifacts.down.sql

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+DROP INDEX IF EXISTS conversations_requirement_idx;
+ALTER TABLE conversations DROP COLUMN IF EXISTS requirement_id;
+
+-- 还原 0011 的 requirement_prototypes；仅回迁 phase='prototyping' 行，
+-- planning/auditing 产物在回滚时丢弃（旧 schema 无处安放）。
+CREATE TABLE requirement_prototypes (
+  id             UUID PRIMARY KEY,
+  requirement_id UUID NOT NULL REFERENCES requirements(id) ON DELETE CASCADE,
+  version        INT  NOT NULL,
+  content        TEXT NOT NULL,
+  note           TEXT NOT NULL DEFAULT '',
+  created_by     UUID NOT NULL REFERENCES users(id) ON DELETE RESTRICT,
+  created_at     TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE (requirement_id, version)
+);
+CREATE INDEX idx_requirement_prototypes_req ON requirement_prototypes(requirement_id);
+INSERT INTO requirement_prototypes (id, requirement_id, version, content, note, created_by, created_at)
+SELECT id, requirement_id, version, content, note, created_by, created_at
+FROM requirement_artifacts WHERE phase = 'prototyping';
+DROP TABLE requirement_artifacts;