新增打手撤单审核

apps/backend/src/db/migrations/043_worker_cancel_requests.sql

@@ -0,0 +1,32 @@
+-- 打手撤单申请：提交后由客服审核，审核通过才执行撤单与处罚。
+
+ALTER TABLE worker_users
+  ADD COLUMN IF NOT EXISTS level_penalty_accepted_count INTEGER NOT NULL DEFAULT 0;
+
+CREATE TABLE IF NOT EXISTS worker_order_cancel_requests (
+  id BIGSERIAL PRIMARY KEY,
+  work_order_id BIGINT NOT NULL REFERENCES work_orders(id) ON DELETE CASCADE,
+  work_order_share_id BIGINT REFERENCES work_order_shares(id) ON DELETE SET NULL,
+  worker_id BIGINT NOT NULL REFERENCES worker_users(id) ON DELETE CASCADE,
+  reason TEXT NOT NULL DEFAULT '',
+  status TEXT NOT NULL DEFAULT 'pending',
+  review_note TEXT NOT NULL DEFAULT '',
+  reviewed_by TEXT NOT NULL DEFAULT '',
+  level_before_id BIGINT REFERENCES worker_levels(id) ON DELETE SET NULL,
+  created_at TIMESTAMPTZ NOT NULL,
+  reviewed_at TIMESTAMPTZ,
+  updated_at TIMESTAMPTZ NOT NULL
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_worker_cancel_requests_pending_target
+  ON worker_order_cancel_requests (work_order_id, worker_id, COALESCE(work_order_share_id, 0))
+  WHERE status = 'pending';
+
+CREATE INDEX IF NOT EXISTS idx_worker_cancel_requests_worker_created
+  ON worker_order_cancel_requests (worker_id, created_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_worker_cancel_requests_status_created
+  ON worker_order_cancel_requests (status, created_at DESC);
+
+COMMENT ON COLUMN worker_users.level_penalty_accepted_count IS '撤单处罚扣减的有效验收次数，不删除真实历史订单';
+COMMENT ON TABLE worker_order_cancel_requests IS '打手发起、客服审核的撤单申请';