diff --git a/docs/BUG_HISTORY.md b/docs/BUG_HISTORY.md
index 69257fe0..e7118981 100644
--- a/docs/BUG_HISTORY.md
+++ b/docs/BUG_HISTORY.md
@@ -329,3 +329,19 @@
 - 相关记录：BUG-009、BUG-017
 - 复发自：无
 - 修复版本：待提交
+
+## BUG-019 | 原问题交接租约过期后永久显示处理中
+
+- 状态：resolved
+- 首次发现：2026-07-22
+- 最近更新：2026-07-22
+- 影响面：生时校正范围终态、跨设备/失败重试、durable 原问题 handoff
+- 用户现象：一次继续咨询在输出前失败后，刷新仍无法重试，接口返回“原问题状态已经变化”。
+- 触发条件：handoff 处于 `claimed` 或 `executing`，两分钟租约已经过期，客户端重新加载交接。
+- 根因：数据库 projection 只看持久化 state，把过期租约仍投影为 `in_progress`；客户端因此不会发起 claim，而执行 RPC 又正确拒绝过期租约，形成永久卡死。
+- 修复：projection 将已过期的 `claimed`/`executing` 租约投影为 `pending`，复用既有加锁 claim RPC 原子接管；未过期租约仍保持 `in_progress`，双设备隔离不变。
+- 验证：迁移契约测试锁定过期租约恢复语义；生产制造过期 claim 后重新加载、claim、执行模型咨询和 settle。
+- 防复发：所有租约型状态的读取投影必须同时解释 lease deadline，不允许只依赖枚举 state。
+- 相关记录：BUG-017、BUG-018
+- 复发自：无
+- 修复版本：待提交
diff --git a/frontend/supabase/migrations/20260722120000_recover_expired_rectification_handoff.sql b/frontend/supabase/migrations/20260722120000_recover_expired_rectification_handoff.sql
new file mode 100644
index 00000000..62b5d02f
--- /dev/null
+++ b/frontend/supabase/migrations/20260722120000_recover_expired_rectification_handoff.sql
@@ -0,0 +1,36 @@
+begin;
+
+create or replace function public.conversational_rectification_handoff_projection(
+  p_user_id uuid,
+  p_case_id uuid
+)
+returns jsonb
+language sql
+stable
+security definer
+set search_path = ''
+as $$
+  select pg_catalog.jsonb_build_object(
+    'caseId', h.case_id,
+    'turnVersion', c.turn_version,
+    'question', h.question,
+    'questionFingerprint', h.question_fingerprint,
+    'requestId', h.request_id,
+    'status', case
+      when h.state = 'pending' then 'pending'
+      when h.state in ('claimed', 'executing')
+        and h.lease_expires_at <= pg_catalog.now() then 'pending'
+      when h.state in ('claimed', 'executing') then 'in_progress'
+      else 'consumed'
+    end,
+    'turn', public.conversational_rectification_case_projection(
+      p_user_id, p_case_id
+    ) -> 'latest_turn'
+  )
+  from public.birth_time_rectification_question_handoffs h
+  join public.birth_time_rectification_cases c
+    on c.id = h.case_id and c.user_id = h.user_id
+  where h.case_id = p_case_id and h.user_id = p_user_id;
+$$;
+
+commit;
diff --git a/frontend/tests/rectification-handoff-service.test.ts b/frontend/tests/rectification-handoff-service.test.ts
index 7f738943..5dea6bbc 100644
--- a/frontend/tests/rectification-handoff-service.test.ts
+++ b/frontend/tests/rectification-handoff-service.test.ts
@@ -201,3 +201,16 @@ test("migration keeps claim, billing recovery, settlement and ACL inside locked
     assert.match(sql, new RegExp(`grant execute on function public\\.${functionName}\\([\\s\\S]*?to service_role`, "i"));
   }
 });
+
+test("expired handoff leases project as pending so another device can reclaim them", () => {
+  const sql = readFileSync(new URL(
+    "../supabase/migrations/20260722120000_recover_expired_rectification_handoff.sql",
+    import.meta.url,
+  ), "utf8");
+
+  assert.match(
+    sql,
+    /h\.state in \('claimed', 'executing'\)[\s\S]*h\.lease_expires_at <= pg_catalog\.now\(\)[\s\S]*then 'pending'/i,
+  );
+  assert.match(sql, /create or replace function public\.conversational_rectification_handoff_projection/i);
+});