原型阶段

migrations/0011_requirement_prototype.down.sql

@@ -0,0 +1,6 @@
+DROP TABLE IF EXISTS requirement_prototypes;
+-- 回滚前把 prototyping 行归并到 planning，否则重建不含 prototyping 的 CHECK 会失败。
+UPDATE requirements SET phase = 'planning' WHERE phase = 'prototyping';
+ALTER TABLE requirements DROP CONSTRAINT requirements_phase_check;
+ALTER TABLE requirements ADD CONSTRAINT requirements_phase_check
+  CHECK (phase IN ('planning','auditing','implementing','reviewing','done'));

migrations/0011_requirement_prototype.up.sql

@@ -0,0 +1,15 @@
+ALTER TABLE requirements DROP CONSTRAINT requirements_phase_check;
+ALTER TABLE requirements ADD CONSTRAINT requirements_phase_check
+  CHECK (phase IN ('planning','prototyping','auditing','implementing','reviewing','done'));
+
+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);