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;

migrations/0012_requirement_artifacts.up.sql

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+-- 统一三阶段产物表：planning/prototyping/auditing 各自独立版本序列。
+-- source_message_id 仅作"产物派生自哪条 chat 消息"的追溯，手填产物为 NULL。
+CREATE TABLE requirement_artifacts (
+  id                UUID PRIMARY KEY,
+  requirement_id    UUID NOT NULL REFERENCES requirements(id) ON DELETE CASCADE,
+  phase             TEXT NOT NULL CHECK (phase IN ('planning','prototyping','auditing')),
+  version           INT  NOT NULL,
+  content           TEXT NOT NULL,
+  note              TEXT NOT NULL DEFAULT '',
+  source_message_id BIGINT REFERENCES messages(id) ON DELETE SET NULL,
+  created_by        UUID NOT NULL REFERENCES users(id) ON DELETE RESTRICT,
+  created_at        TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE (requirement_id, phase, version)
+);
+CREATE INDEX idx_requirement_artifacts_req_phase ON requirement_artifacts(requirement_id, phase);
+
+-- 旧 prototype 数据迁移（保留原 id/version/created_at）后下线旧表。
+INSERT INTO requirement_artifacts
+  (id, requirement_id, phase, version, content, note, source_message_id, created_by, created_at)
+SELECT id, requirement_id, 'prototyping', version, content, note, NULL, created_by, created_at
+FROM requirement_prototypes;
+DROP TABLE requirement_prototypes;
+
+-- 会话挂载 requirement（新列在表末尾，满足 sqlc 列序约定）。
+ALTER TABLE conversations ADD COLUMN requirement_id UUID REFERENCES requirements(id);
+CREATE INDEX conversations_requirement_idx ON conversations(requirement_id) WHERE requirement_id IS NOT NULL;