From 32a1885f0d4b9969552b8871809100e237ec13de Mon Sep 17 00:00:00 2001
From: Nexus Agent <agent@local>
Date: Fri, 12 Jun 2026 03:47:56 +0800
Subject: [PATCH] =?UTF-8?q?feat(watch):=20=E7=9B=91=E6=B5=8B=E6=A7=BD?=
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支持随时暂停/恢复实时监测并保留槽位；TTL 到期自动暂停不占删槽；修复到期竞态导致空槽与唯一约束冲突；探针 parse_error 与中文错误；移除失败 snackbar。
---
 ...6-11-watch-slot-monitoring-enhancements.md | 117 ++++++++++++++
 ...2026-06-12-watch-slot-monitoring-deploy.md |  67 ++++++++
 .../2026-06-11-watch-probe-parse-error-fix.md |  41 +++++
 ...2026-06-11-watch-slot-monitoring-toggle.md |  55 +++++++
 .../2026-06-12-watch-ttl-expiry-race-fix.md   |  35 ++++
 docs/reports/2026-06-12-watch-bug-patrol.md   |  40 +++++
 ...2026-06-12-watch-slot-monitoring-patrol.md | 100 ++++++++++++
 frontend/src/api/index.ts                     |   3 +
 .../watch/WatchProbeRecordsTable.vue          |  18 +--
 .../src/components/watch/WatchSlotCard.vue    |  73 ++++++++-
 .../src/components/watch/WatchSlotRow.vue     |  34 +++-
 frontend/src/composables/useWatchPins.ts      |  60 +++++--
 frontend/src/utils/watchFormat.ts             |  89 ++++++++++
 server/api/watch.py                           |  56 +++++++
 server/application/services/watch_service.py  | 141 +++++++++++++---
 server/background/watch_probe_runner.py       |  31 +++-
 server/domain/models/__init__.py              |  12 ++
 server/infrastructure/database/migrations.py  |   4 +
 server/infrastructure/database/watch_repo.py  | 151 +++++++++++++----
 server/infrastructure/ssh/remote_probe.py     | 147 ++++++++++++-----
 server/utils/watch_metrics.py                 |  16 ++
 server/utils/watch_probe_errors.py            |  61 +++++++
 server/utils/watch_state.py                   |  19 +++
 tests/test_watch_metrics.py                   |  17 ++
 tests/test_watch_pins.py                      | 153 ++++++++++++++++++
 tests/test_watch_probe_errors.py              |  23 +++
 26 files changed, 1437 insertions(+), 126 deletions(-)
 create mode 100644 docs/audit/2026-06-11-watch-slot-monitoring-enhancements.md
 create mode 100644 docs/audit/2026-06-12-watch-slot-monitoring-deploy.md
 create mode 100644 docs/changelog/2026-06-11-watch-probe-parse-error-fix.md
 create mode 100644 docs/changelog/2026-06-11-watch-slot-monitoring-toggle.md
 create mode 100644 docs/changelog/2026-06-12-watch-ttl-expiry-race-fix.md
 create mode 100644 docs/reports/2026-06-12-watch-bug-patrol.md
 create mode 100644 docs/reports/2026-06-12-watch-slot-monitoring-patrol.md
 create mode 100644 server/utils/watch_probe_errors.py
 create mode 100644 server/utils/watch_state.py
 create mode 100644 tests/test_watch_probe_errors.py

diff --git a/docs/audit/2026-06-11-watch-slot-monitoring-enhancements.md b/docs/audit/2026-06-11-watch-slot-monitoring-enhancements.md
new file mode 100644
index 00000000..b8d5306d
--- /dev/null
+++ b/docs/audit/2026-06-11-watch-slot-monitoring-enhancements.md
@@ -0,0 +1,117 @@
+# 审计 — 监测槽开关 / 8h·24h / 暂停占槽 / 探针中文错误
+
+**日期**：2026-06-11  
+**Changelog**:
+- `docs/changelog/2026-06-11-watch-slot-monitoring-toggle.md`
+- `docs/changelog/2026-06-11-watch-probe-parse-error-fix.md`
+
+## 范围（未提交工作区，+799 / −124 行）
+
+| 层级 | 文件 |
+|------|------|
+| 模型/迁移 | `server/domain/models/__init__.py`（`monitoring_enabled`、`ttl_hours`） |
+| | `server/infrastructure/database/migrations.py` |
+| Repository | `server/infrastructure/database/watch_repo.py` |
+| Service | `server/application/services/watch_service.py` |
+| API | `server/api/watch.py`（PATCH monitoring / ttl） |
+| 探针 | `server/background/watch_probe_runner.py` |
+| | `server/infrastructure/ssh/remote_probe.py` |
+| 工具 | `server/utils/watch_metrics.py` |
+| | `server/utils/watch_state.py`（**新增** Redis 清理） |
+| | `server/utils/watch_probe_errors.py`（**新增** 中文错误） |
+| 前端 | `frontend/src/composables/useWatchPins.ts` |
+| | `frontend/src/components/watch/WatchSlotCard.vue` |
+| | `frontend/src/components/watch/WatchSlotRow.vue` |
+| | `frontend/src/components/watch/WatchProbeRecordsTable.vue` |
+| | `frontend/src/utils/watchFormat.ts` |
+| | `frontend/src/api/index.ts`（`http.patch`） |
+| 测试 | `tests/test_watch_pins.py` |
+| | `tests/test_watch_metrics.py` |
+| | `tests/test_watch_probe_errors.py`（**新增**） |
+
+## 功能摘要
+
+1. **实时监测开关**：`monitoring_enabled`；关则停 5s 探针，槽位保留
+2. **8h / 24h**：`ttl_hours` + `PATCH /pins/{slot}/ttl`；默认 8h，显式切 24h
+3. **暂停永久占槽**：`monitoring_enabled=false` 时不参与 TTL 过期删除
+4. **时长到期**：自动暂停（等同关开关），结束 session，**不删 pin**
+5. **恢复 Agent 60s**：无活跃监测时清理 `watch:live/proc/last`；Agent 心跳逻辑未改
+6. **parse_error 修复**：Agent 有 CPU/内存时 SSH 失败不拖垮整轮；SSH 脚本加固
+7. **错误中文**：后端写入 + 前端 `formatProbeError` 兼容历史英文
+
+## Step 3 规则扫描
+
+| H | 规则 | 结论 |
+|---|------|------|
+| H1 | 鉴权 / IDOR | **PASS** — 新 PATCH 均 `get_current_admin`；repo 带 `admin_id` |
+| H2 | 无静默吞错 | **PASS** — 探针失败仍落库；Redis 清理失败会抛错（生产有 Redis） |
+| H3 | 无新密钥 | **PASS** |
+| H4 | CUD 审计 | **PASS** — `watch_pin_pause` / `watch_pin_resume` / `watch_pin_ttl` / remove |
+| H5 | 输入边界 | **PASS** — `Literal[8,24]`、`slot_index` 0–3 |
+| H6 | 迁移 | **PASS** — ALTER + duplicate column 容错 |
+| H7 | 产品风险 | **RISK 接受** — 4 槽均可永久暂停占用，需手动 X 释放（用户明确要求） |
+
+## 逐模块走读
+
+### 后端
+
+| 模块 | 结论 | 备注 |
+|------|------|------|
+| `watch_repo._pin_still_occupied` | PASS | 暂停不占 TTL；开启监测才看过期 |
+| `expire_due_pins` | PASS | 改为暂停 + end session，不 delete pin |
+| `set_monitoring_enabled` + `_ensure_open_session` | PASS | TTL 到期后再开自动新 session |
+| `_restore_idle_agent_watch` | PASS | 全局无监测才清 Redis |
+| `replace_slot` | PASS | 保留槽位原 `ttl_hours`（审查项已修） |
+| `probe_server_metrics` | PASS | Agent 基础指标优先；SSH 仅补 IO |
+| `watch_probe_error_zh` | PASS | 与前端映射一致 |
+
+### 前端
+
+| 模块 | 结论 | 备注 |
+|------|------|------|
+| `WatchSlotCard` | PASS | 开关 + 8h/24h + 暂停态 UI |
+| `tickCountdown` | PASS | 归零 `refreshPins`，不再误置 `empty` |
+| `formatProbeError` | PASS | 状态/错误/来源中文化 |
+| `WatchProbeRecordsTable` | PASS | 筛选器与列中文 |
+
+## 审计中发现并修复
+
+| 项 | 严重度 | 处理 |
+|----|--------|------|
+| `mock_watch_redis` 未 patch `watch_state.get_redis` | **P1** | 已修：`remove_slot` / `set_slot_monitoring` 单测 2 失败 → 19 passed |
+
+## 遗留建议（非阻塞）
+
+| 项 | 说明 |
+|----|------|
+| 设计文档 | 开关/暂停语义变更较大，建议补 `docs/design/specs/` 短文（当前仅 changelog） |
+| HTTP 集成测试 | PATCH monitoring/ttl 的 404/422 路径未覆盖 |
+| TTL 到期审计 | 后台 `expire_due_pins` 无 audit_log（可接受，session.end_reason=expired 可查） |
+| PATCH 404 语义 | 「槽位无效」与「槽位为空」均 404，与 POST 422 不一致 |
+
+## Closure
+
+| H | 判定 | 依据 |
+|---|------|------|
+| H1–H6 | **PASS** | 鉴权、审计、迁移、探针落库均符合铁律 |
+| H7 | **RISK 接受** | 用户要求暂停永久占槽 |
+
+## DoD
+
+- [x] `.venv/bin/pytest tests/test_watch_metrics.py tests/test_watch_pins.py tests/test_watch_probe_errors.py` — **19 passed**
+- [x] `cd frontend && npm run type-check`
+- [x] 审计修复：test fixture patch `watch_state.get_redis`
+- [ ] `bash scripts/local_verify.sh` / 门控 7 道（部署前）
+- [ ] 生产浏览器：开关暂停、24h 切换、到期自动暂停、中文错误展示
+
+## 验证命令
+
+```bash
+.venv/bin/pytest tests/test_watch_metrics.py tests/test_watch_pins.py tests/test_watch_probe_errors.py -q
+cd frontend && npm run type-check
+bash deploy/pre_deploy_check.sh
+```
+
+## 合并建议
+
+**Approve with notes** — 功能完整、测试绿、安全与审计达标；部署前跑门控 + 浏览器终验。遗留 HTTP 集成测试与设计文档可跟进 PR。
diff --git a/docs/audit/2026-06-12-watch-slot-monitoring-deploy.md b/docs/audit/2026-06-12-watch-slot-monitoring-deploy.md
new file mode 100644
index 00000000..7171117a
--- /dev/null
+++ b/docs/audit/2026-06-12-watch-slot-monitoring-deploy.md
@@ -0,0 +1,67 @@
+# 审计 — 监测槽开关 / TTL / 到期竞态 / 探针中文 / 移除提示
+
+**日期**：2026-06-12  
+**Changelog**:
+- `docs/changelog/2026-06-11-watch-slot-monitoring-toggle.md`
+- `docs/changelog/2026-06-11-watch-probe-parse-error-fix.md`
+- `docs/changelog/2026-06-12-watch-ttl-expiry-race-fix.md`
+
+## 范围（文件清单）
+
+| 层级 | 文件 |
+|------|------|
+| 模型/迁移 | `server/domain/models/__init__.py` |
+| | `server/infrastructure/database/migrations.py` |
+| Repository | `server/infrastructure/database/watch_repo.py` |
+| Service | `server/application/services/watch_service.py` |
+| API | `server/api/watch.py` |
+| 探针 | `server/background/watch_probe_runner.py` |
+| | `server/infrastructure/ssh/remote_probe.py` |
+| 工具 | `server/utils/watch_metrics.py` |
+| | `server/utils/watch_state.py` |
+| | `server/utils/watch_probe_errors.py` |
+| 前端 | `frontend/src/api/index.ts` |
+| | `frontend/src/composables/useWatchPins.ts` |
+| | `frontend/src/components/watch/WatchSlotCard.vue` |
+| | `frontend/src/components/watch/WatchSlotRow.vue` |
+| | `frontend/src/components/watch/WatchProbeRecordsTable.vue` |
+| | `frontend/src/utils/watchFormat.ts` |
+| 测试 | `tests/test_watch_pins.py` |
+| | `tests/test_watch_metrics.py` |
+| | `tests/test_watch_probe_errors.py` |
+
+## Step 3 规则扫描
+
+| H | 规则 | 结论 |
+|---|------|------|
+| H1 | 鉴权 / IDOR | PASS — PATCH/DELETE 均 `get_current_admin` + admin_id 隔离 |
+| H2 | 无静默吞错 | PASS — 探针失败落库；前端 remove/monitoring/ttl 均有 snackbar |
+| H3 | 无新密钥 | PASS |
+| H4 | CUD 审计 | PASS — pause/resume/ttl/remove |
+| H5 | 输入边界 | PASS — `Literal[8,24]`、slot 0–3 |
+| H6 | 迁移 | PASS — monitoring_enabled + ttl_hours ALTER |
+| H7 | TTL 竞态 | PASS — `_finalize_due_pins` 读/写路径同步到期 |
+
+## Closure
+
+| H | 判定 | 依据 |
+|---|------|------|
+| H1–H6 | PASS | 鉴权、审计、迁移、探针落库 |
+| H7 | PASS | 到期 ghost pin 不再显示空槽 |
+
+## DoD
+
+- [x] `pytest tests/test_watch_*.py` — 21 passed
+- [x] `npm run type-check`
+- [x] P0 TTL 竞态修复 + P2 onRemove snackbar
+- [ ] `bash deploy/pre_deploy_check.sh`
+- [ ] 生产浏览器终验
+
+## 验证命令
+
+```bash
+.venv/bin/pytest tests/test_watch_*.py -q
+cd frontend && npm run type-check
+bash scripts/local_verify.sh
+bash deploy/pre_deploy_check.sh
+```
diff --git a/docs/changelog/2026-06-11-watch-probe-parse-error-fix.md b/docs/changelog/2026-06-11-watch-probe-parse-error-fix.md
new file mode 100644
index 00000000..16e3ded0
--- /dev/null
+++ b/docs/changelog/2026-06-11-watch-probe-parse-error-fix.md
@@ -0,0 +1,41 @@
+# 监测槽 parse_error 修复
+
+**日期**: 2026-06-11
+
+## 摘要
+
+修复监测槽显示 `parse_error` 的常见路径：Agent 有心跳但缺 IO 时 SSH 补采失败导致整轮探针失败。
+
+## 根因
+
+- `redis_sample_has_io` 为 false 时强制走 SSH；SSH JSON 解析失败且无完整 Redis IO 时返回 `parse_error`
+- 已装 Agent 的机器通常有 CPU/内存心跳，不应因 SSH 失败而整轮失败
+- SSH 脚本在 `getloadavg`/`net_io_counters` 异常时可能无 JSON 输出
+
+## 修复
+
+- Agent 有 CPU/内存时优先用 Redis；SSH 仅补充 IO，SSH 失败仍显示 Agent 指标
+- SSH 探针脚本增加 try/except；JSON 解析支持行内 `{` 前缀噪声
+- 前端 `parse_error` 显示为「探针解析失败」，并展示 `metrics.error` 详情
+
+## 2026-06-11 补充：错误中文提示
+
+- 新增 `server/utils/watch_probe_errors.py`，新探针失败写入中文 `error`
+- 前端 `formatProbeError` / `probeStatusLabel` / `probeSourceLabel` 统一中文（含历史英文记录）
+- 监测历史探针记录表：状态筛选与错误列中文化
+
+## 涉及文件
+
+- `server/background/watch_probe_runner.py`
+- `server/utils/watch_metrics.py`
+- `server/infrastructure/ssh/remote_probe.py`
+- `frontend/src/utils/watchFormat.ts`
+- `frontend/src/components/watch/WatchSlotCard.vue`
+- `tests/test_watch_metrics.py`
+
+## 验证
+
+```bash
+pytest tests/test_watch_metrics.py -q
+cd frontend && npm run type-check
+```
diff --git a/docs/changelog/2026-06-11-watch-slot-monitoring-toggle.md b/docs/changelog/2026-06-11-watch-slot-monitoring-toggle.md
new file mode 100644
index 00000000..f167132d
--- /dev/null
+++ b/docs/changelog/2026-06-11-watch-slot-monitoring-toggle.md
@@ -0,0 +1,55 @@
+# 监测槽实时监测开关
+
+**日期**: 2026-06-11
+
+## 摘要
+
+为每台已固定监测槽的服务器增加「实时监测」开关。关闭后停止 5 秒探针与 WebSocket 推送，槽位仍保留同一台服务器，8 小时倒计时暂停；重新开启时重置 8 小时窗口。
+
+## 动机
+
+用户希望随时关闭某台服务器的实时监测，而不必等到 8 小时到期或点击删除释放槽位。
+
+## 涉及文件
+
+- `server/domain/models/__init__.py` — `WatchPin.monitoring_enabled`
+- `server/infrastructure/database/migrations.py` — 列迁移
+- `server/infrastructure/database/watch_repo.py` — 暂停/恢复、过期逻辑
+- `server/application/services/watch_service.py` — `set_slot_monitoring`、槽位 payload
+- `server/api/watch.py` — `PATCH /api/watch/pins/{slot_index}/monitoring`
+- `server/background/watch_probe_runner.py` — 仅探针已开启的 pin
+- `frontend/src/api/index.ts` — `http.patch`
+- `frontend/src/composables/useWatchPins.ts`
+- `frontend/src/components/watch/WatchSlotCard.vue`
+- `frontend/src/components/watch/WatchSlotRow.vue`
+- `tests/test_watch_pins.py`
+
+## 迁移 / 重启
+
+- 需 API 重启以执行 schema migration（`monitoring_enabled` 列）
+- 无需手动 SQL
+
+## 验证
+
+```bash
+pytest tests/test_watch_pins.py -q
+cd frontend && npm run type-check
+```
+
+- 仪表盘监测槽：开关关闭 → 卡片灰显、无实时指标；重新开启 → 恢复探针并重置倒计时
+- 时长切换：默认 8h；点击 24h → 重置为 24 小时窗口；暂停时切换时长保留偏好，开启后生效
+
+## 2026-06-11 补充：暂停永久占槽 + 恢复 Agent 60s
+
+- **暂停/时长到期**：不再删除 pin；`monitoring_enabled=false`，槽位永久保留直至手动移除或重新开启
+- **8h/24h 到期**：自动暂停（等同关开关），结束 session（`expired`），保留槽位
+- **恢复 Agent 模式**：当无任何槽位对该机开启 5s 监测时，清理 `watch:live/proc/last` Redis；子机 Agent 始终 60s 智能心跳（CPU 波动 >10% 或超阈值才上报），无需改 Agent 配置
+- **重新开启**：若 session 已结束则自动开新 session
+- **涉及**：`server/utils/watch_state.py`、`watch_repo.expire_due_pins`、`watch_service`、`watch_probe_runner`、前端 countdown 到期 refresh
+
+## 2026-06-11 补充：8h / 24h 时长选项
+
+- `watch_pins.ttl_hours` 列（默认 8，仅允许 8 或 24）
+- `PATCH /api/watch/pins/{slot_index}/ttl` — 切换时长；监测开启时同步重置 `expires_at`
+- `POST /api/watch/pins` 可选 `ttl_hours: 8 | 24`（默认 8）
+- 槽位卡片「8h / 24h」切换按钮，须显式点击才改为 24h
diff --git a/docs/changelog/2026-06-12-watch-ttl-expiry-race-fix.md b/docs/changelog/2026-06-12-watch-ttl-expiry-race-fix.md
new file mode 100644
index 00000000..14f0418a
--- /dev/null
+++ b/docs/changelog/2026-06-12-watch-ttl-expiry-race-fix.md
@@ -0,0 +1,35 @@
+# Changelog — 监测槽 TTL 到期竞态修复
+
+**日期**：2026-06-12
+
+## 摘要
+
+修复 TTL 到期与后台 `expire_due_pins`（5s 探针循环）之间的竞态窗口：槽位短暂显示为空、无法添加/移除、可能触发唯一约束冲突。
+
+## 动机
+
+`list_active_pins_for_admin` 在 `monitoring_enabled=true` 且 `expires_at<=now` 时排除 pin，但 DB 行仍在且 `monitoring_enabled` 仍为 true，直到探针循环执行 `expire_due_pins`。此窗口内 UI 显示空槽，但 `create_pin` 会因 `uq_watch_pins_admin_slot` 失败。
+
+## 变更
+
+- `WatchService._finalize_due_pins()`：在读/写路径同步到期 pin（暂停 + end session + 按需清 Redis）
+- 在 `list_slots`、`pin_server`、`replace_slot`、`remove_slot`、`set_slot_monitoring`、`set_slot_ttl` 入口调用
+- 新增单测：`test_watch_pin_ttl_expiry_list_syncs_before_display`、`test_watch_pin_ttl_expiry_pin_server_no_duplicate`
+- **P2**：`WatchSlotRow.onRemove` 失败时 snackbar 提示
+
+## 涉及文件
+
+- `server/application/services/watch_service.py`
+- `frontend/src/components/watch/WatchSlotRow.vue`
+- `tests/test_watch_pins.py`
+
+## 迁移 / 重启
+
+- 无需迁移
+- 需重启 API
+
+## 验证
+
+```bash
+.venv/bin/pytest tests/test_watch_pins.py -q
+```
diff --git a/docs/reports/2026-06-12-watch-bug-patrol.md b/docs/reports/2026-06-12-watch-bug-patrol.md
new file mode 100644
index 00000000..9096a58f
--- /dev/null
+++ b/docs/reports/2026-06-12-watch-bug-patrol.md
@@ -0,0 +1,40 @@
+# Bug 巡查 — 监测槽增强（2026-06-12）
+
+**范围**：工作区未提交的 watch 开关 / TTL / 探针修复  
+**方法**：代码走读 + 单测 + 竞态分析
+
+## 发现与处理
+
+| # | 严重度 | 问题 | 状态 |
+|---|--------|------|------|
+| 1 | **P0** | TTL 到期后 ~5s 内槽位显示「空」，但 DB ghost pin 仍在；添加服务器 → 唯一约束冲突；点 X 移除 → 404「槽位为空」 | **已修** — API 读/写路径同步 `_finalize_due_pins` |
+| 2 | P2 | `onRemove` 无 try/catch，API 失败时未提示 | 未修（低概率，可跟进） |
+| 3 | P3 | 暂停态仍可通过 `get_processes` 拉取进程（数据可能过期） | 设计可接受 |
+| 4 | — | Gate 7 被并行 Agent 提示改动阻塞 | 非 watch bug |
+
+## P0 根因
+
+```
+expires_at 已过
+  → list 查询 or_(paused, expires_at>now) 排除该行
+  → UI empty=true
+  → DB 仍有 monitoring_enabled=true 的行
+  → create_pin / pick 槽位 → IntegrityError
+```
+
+探针循环每 5s 才跑 `expire_due_pins`，此前无 API 侧兜底。
+
+## 修复
+
+`WatchService._finalize_due_pins()` 在 `list_slots` 及所有槽位变更 API 入口调用，与探针循环逻辑一致：暂停 pin、结束 session、无活跃监测时清 Redis。
+
+## 测试
+
+```text
+pytest tests/test_watch_pins.py → 7 passed
+pytest tests/test_watch_*.py   → 21 passed
+```
+
+## 未部署
+
+生产仍为旧版本；修复需部署后浏览器终验 TTL 归零场景。
diff --git a/docs/reports/2026-06-12-watch-slot-monitoring-patrol.md b/docs/reports/2026-06-12-watch-slot-monitoring-patrol.md
new file mode 100644
index 00000000..d07d4668
--- /dev/null
+++ b/docs/reports/2026-06-12-watch-slot-monitoring-patrol.md
@@ -0,0 +1,100 @@
+# 巡检 — 监测槽开关 / 8h·24h / 暂停占槽 / 探针修复
+
+**日期**：2026-06-12  
+**范围**：工作区未提交改动（监测槽增强 + parse_error 修复 + 中文错误）  
+**生产**：https://api.synaglobal.vip（**尚未部署本批改动**）
+
+## 进度条
+
+| 步骤 | 状态 |
+|------|------|
+| 实现 | ✅ 工作区完成 |
+| 本地验证 | ✅ L2b 26/26 + ruff |
+| 单测 | ✅ watch 23/23 |
+| 类型检查 | ✅ vue-tsc |
+| 门控 7/7 | ⚠️ 6/7（Gate 7 被 **Agent 提示** 并行改动阻塞，非 watch 本身） |
+| 部署 | ❌ 未执行 |
+| 生产健康 | ✅ `/health` → `ok` |
+| 浏览器终验 | ❌ 待部署后 |
+
+## 本地验证
+
+### 单测
+
+```text
+pytest tests/test_watch_*.py tests/test_watch_probe_errors.py
+→ 23 passed
+```
+
+### L2b API E2E（local_verify.sh）
+
+```text
+26/26 passed
+ruff F: All checks passed
+═══ All local checks passed ═══
+```
+
+### 前端
+
+```text
+npm run type-check → PASS
+```
+
+### 门控 pre_deploy_check.sh
+
+| Gate | 结果 |
+|------|------|
+| 1 Changelog | PASS（2026-06-12-server-agent-action-hint.md） |
+| 2 Audit | PASS（2026-06-12-files-watch-ui-fixes.md） |
+| 3 Test | PASS |
+| 4 Lint | PASS |
+| 5 Import | PASS |
+| 6 Security | PASS |
+| 7 Review | **BLOCK** — 以下文件有 diff 但未列入当日 audit |
+
+Gate 7 阻塞文件（**Agent 版本提示**，与监测槽无关）：
+
+- `frontend/src/components/servers/ServerAgentHint.vue`
+- `frontend/src/components/servers/ServerInlineDetail.vue`
+- `frontend/src/composables/servers/useServerFormDialog.ts`
+- `frontend/src/types/api.ts`
+- `server/api/servers.py`
+- `server/utils/agent_version.py`
+- `tests/test_agent_version.py`
+
+监测槽改动已有独立审计：`docs/audit/2026-06-11-watch-slot-monitoring-enhancements.md`。
+
+## 生产探针
+
+| 检查 | 结果 |
+|------|------|
+| `GET /health` | 200 `ok` |
+| `GET /app/` | 200 |
+| `GET /api/watch/pins`（无 JWT） | 401（预期） |
+| `PATCH /api/watch/pins/0/monitoring`（无 JWT） | 401（端点存在性需部署后带 JWT 终验） |
+
+**说明**：生产当前运行的是已部署版本；监测槽开关 / TTL PATCH / 中文错误 / parse_error 修复均在工作区，**线上行为未变**。
+
+## 功能验收清单（部署后浏览器终验）
+
+1. **开关暂停**：关实时监测 → 5s 探针停止，槽位仍占用，UI 显示暂停态
+2. **重新开启**：开开关 → 若 session 已结束则自动开新 session，探针恢复
+3. **8h / 24h**：默认 8h；点 24h 后 `expires_at` 延长；replace 槽位保留原 TTL
+4. **TTL 到期**：自动暂停（不删 pin），Agent 恢复 60s 智能心跳
+5. **parse_error**：Agent 有 CPU/内存时 SSH 失败不应整轮 parse_error
+6. **中文错误**：探针失败状态与错误列显示中文
+
+## 部署前待办
+
+1. **Gate 7**：为 Agent 提示改动补 audit，或与监测槽分两次提交/部署
+2. **迁移**：`watch_pins.monitoring_enabled` + `ttl_hours`（migrations.py 已含）
+3. **部署**：用户批准后 `bash deploy/deploy-production.sh`
+4. **前端构建**：Docker 内 vite build 或 `deploy/deploy-frontend.sh`
+
+## 本次巡检修复
+
+- 删除 `server/infrastructure/ssh/remote_probe.py` 未使用的 `import logging`（local_verify ruff F401）
+
+## 结论
+
+**代码质量就绪**（单测 + L2b + lint + 类型检查均通过）。**部署被 Gate 7 阻塞**（并行 Agent 提示改动缺 audit）。监测槽功能本身审计完备，建议与 Agent 提示改动解耦提交，或补全 audit 后一并部署。
diff --git a/frontend/src/api/index.ts b/frontend/src/api/index.ts
index f3b82185..47e9ab7e 100644
--- a/frontend/src/api/index.ts
+++ b/frontend/src/api/index.ts
@@ -296,6 +296,9 @@ export const http = {
   put: <T = any>(path: string, body?: unknown) =>
     api<T>(path, { method: 'PUT', body: body ? JSON.stringify(body) : undefined }),
 
+  patch: <T = any>(path: string, body?: unknown) =>
+    api<T>(path, { method: 'PATCH', body: body ? JSON.stringify(body) : undefined }),
+
   delete: <T = any>(path: string) =>
     api<T>(path, { method: 'DELETE' }),
 
diff --git a/frontend/src/components/watch/WatchProbeRecordsTable.vue b/frontend/src/components/watch/WatchProbeRecordsTable.vue
index 28f2afe9..893981fe 100644
--- a/frontend/src/components/watch/WatchProbeRecordsTable.vue
+++ b/frontend/src/components/watch/WatchProbeRecordsTable.vue
@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { ref, watch } from 'vue'
 import { http } from '@/api'
-import { formatBytesPerSec, probeStatusColor } from '@/utils/watchFormat'
+import { formatBytesPerSec, probeStatusColor, probeStatusLabel, formatProbeError, probeSourceLabel, PROBE_STATUS_FILTER_ITEMS } from '@/utils/watchFormat'
 
 export interface ProbeRecordRow {
   id: number
@@ -75,12 +75,7 @@ watch(
     <div class="d-flex align-center ga-2 mb-3">
       <v-select
         v-model="statusFilter"
-        :items="[
-          { title: '全部状态', value: null },
-          { title: 'ok', value: 'ok' },
-          { title: 'ssh_timeout', value: 'ssh_timeout' },
-          { title: 'no_cred', value: 'no_cred' },
-        ]"
+        :items="PROBE_STATUS_FILTER_ITEMS"
         item-title="title"
         item-value="value"
         label="探针状态"
@@ -105,14 +100,19 @@ watch(
     >
       <template #item.probe_status="{ item }">
         <v-chip size="x-small" :color="probeStatusColor(item.probe_status)" variant="tonal" label>
-          {{ item.probe_status }}
+          {{ probeStatusLabel(item.probe_status) }}
         </v-chip>
       </template>
+      <template #item.source="{ item }">{{ probeSourceLabel(item.source) }}</template>
       <template #item.net_up_bps="{ item }">{{ formatBytesPerSec(item.net_up_bps) }}</template>
       <template #item.net_down_bps="{ item }">{{ formatBytesPerSec(item.net_down_bps) }}</template>
       <template #item.duration_ms="{ item }">{{ item.duration_ms ?? '—' }} ms</template>
       <template #item.error="{ item }">
-        <span class="text-caption text-truncate d-inline-block" style="max-width: 200px">{{ item.error || '—' }}</span>
+        <span
+          class="text-caption text-truncate d-inline-block"
+          style="max-width: 200px"
+          :title="formatProbeError(item.error, item.probe_status)"
+        >{{ formatProbeError(item.error, item.probe_status) }}</span>
       </template>
     </v-data-table>
     <div class="d-flex justify-center align-center ga-2 mt-3">
diff --git a/frontend/src/components/watch/WatchSlotCard.vue b/frontend/src/components/watch/WatchSlotCard.vue
index c8c18131..9d3ba872 100644
--- a/frontend/src/components/watch/WatchSlotCard.vue
+++ b/frontend/src/components/watch/WatchSlotCard.vue
@@ -1,7 +1,7 @@
 <script setup lang="ts">
-import { ref } from 'vue'
+import { ref, computed } from 'vue'
 import type { WatchSlot } from '@/composables/useWatchPins'
-import { formatBytesPerSec, formatRemaining, probeStatusColor } from '@/utils/watchFormat'
+import { formatBytesPerSec, formatRemaining, probeStatusColor, probeStatusLabel, formatProbeError } from '@/utils/watchFormat'
 import WatchSparkline from '@/components/watch/WatchSparkline.vue'
 
 const props = defineProps<{
@@ -13,8 +13,13 @@ const emit = defineEmits<{
   processes: [slot: WatchSlot]
   history: [slot: WatchSlot]
   pick: [slotIndex: number]
+  monitoring: [slotIndex: number, enabled: boolean]
+  ttl: [slotIndex: number, hours: 8 | 24]
 }>()
 
+const monitoringOn = computed(() => props.slot.monitoring_enabled !== false)
+const slotTtl = computed(() => (props.slot.ttl_hours === 24 ? 24 : 8) as 8 | 24)
+
 const chartMetric = ref<'cpu_pct' | 'mem_pct' | 'disk_pct'>('cpu_pct')
 
 function pct(v: number | null | undefined) {
@@ -29,7 +34,10 @@ function pct(v: number | null | undefined) {
     border
     rounded="lg"
     class="watch-slot-card pa-3 watch-slot-card--filled"
-    :class="{ 'watch-slot-card--error': slot.metrics?.probe_status && slot.metrics.probe_status !== 'ok' }"
+    :class="{
+      'watch-slot-card--error': monitoringOn && slot.metrics?.probe_status && slot.metrics.probe_status !== 'ok',
+      'watch-slot-card--paused': !monitoringOn,
+    }"
     role="button"
     tabindex="0"
     @click="emit('history', slot)"
@@ -42,9 +50,38 @@ function pct(v: number | null | undefined) {
       <v-chip size="x-small" variant="tonal" color="info" label>
         槽 {{ slot.slot_index + 1 }}
       </v-chip>
+      <v-switch
+        :model-value="monitoringOn"
+        density="compact"
+        hide-details
+        color="primary"
+        class="watch-slot-switch ml-1"
+        @click.stop
+        @update:model-value="emit('monitoring', slot.slot_index, $event ?? false)"
+      />
       <v-btn icon="mdi-close" size="x-small" variant="text" @click="emit('remove', slot.slot_index)" />
     </div>
 
+    <div class="d-flex align-center mb-2 ga-1" @click.stop>
+      <span class="text-caption text-medium-emphasis mr-1">时长</span>
+      <v-btn-toggle
+        :model-value="slotTtl"
+        density="compact"
+        variant="outlined"
+        divided
+        mandatory
+        @update:model-value="emit('ttl', slot.slot_index, ($event ?? 8) as 8 | 24)"
+      >
+        <v-btn :value="8" size="x-small">8h</v-btn>
+        <v-btn :value="24" size="x-small">24h</v-btn>
+      </v-btn-toggle>
+    </div>
+
+    <div v-if="!monitoringOn" class="text-caption text-medium-emphasis mb-2" @click.stop>
+      实时监测已关闭 · 槽位保留 · Agent 恢复 60s 智能上报
+    </div>
+
+    <template v-if="monitoringOn">
     <div @click.stop>
     <v-chip
       v-if="slot.metrics?.probe_status"
@@ -54,7 +91,7 @@ function pct(v: number | null | undefined) {
       class="mb-2"
       label
     >
-      {{ slot.metrics.probe_status === 'ok' ? '正常' : slot.metrics.probe_status }}
+      {{ probeStatusLabel(slot.metrics.probe_status) }}
     </v-chip>
 
     <div class="d-flex justify-space-between text-caption mb-1">
@@ -80,18 +117,32 @@ function pct(v: number | null | undefined) {
 
     <WatchSparkline :points="slot.sparkline || []" :metric="chartMetric" />
 
-    <div v-if="slot.metrics?.error" class="text-caption text-error mt-1 text-truncate">
-      {{ slot.metrics.error }}
+    <div
+      v-if="slot.metrics?.error"
+      class="text-caption text-error mt-1 text-truncate"
+      :title="formatProbeError(slot.metrics.error, slot.metrics.probe_status)"
+    >
+      {{ formatProbeError(slot.metrics.error, slot.metrics.probe_status) }}
     </div>
 
     <div class="d-flex align-center justify-space-between mt-2">
-      <span class="text-caption text-medium-emphasis">剩余 {{ formatRemaining(slot.remaining_sec) }}</span>
+      <span class="text-caption text-medium-emphasis">
+        剩余 {{ formatRemaining(slot.remaining_sec) }} · {{ slotTtl }}h
+      </span>
       <div class="d-flex ga-1">
         <v-btn size="x-small" variant="text" @click.stop="emit('processes', slot)">进程</v-btn>
         <v-btn size="x-small" variant="text" @click.stop="emit('history', slot)">历史</v-btn>
       </div>
     </div>
     </div>
+    </template>
+
+    <div v-else class="d-flex align-center justify-space-between mt-2" @click.stop>
+      <span class="text-caption text-medium-emphasis">已暂停 · {{ slotTtl }}h</span>
+      <div class="d-flex ga-1">
+        <v-btn size="x-small" variant="text" @click.stop="emit('history', slot)">历史</v-btn>
+      </div>
+    </div>
   </v-card>
 
   <v-card
@@ -135,4 +186,12 @@ function pct(v: number | null | undefined) {
 .watch-slot-card--error {
   border-color: rgb(var(--v-theme-error)) !important;
 }
+.watch-slot-card--paused {
+  opacity: 0.72;
+  background: rgba(var(--v-theme-surface-variant), 0.15);
+}
+.watch-slot-switch {
+  flex: 0 0 auto;
+  transform: scale(0.85);
+}
 </style>
diff --git a/frontend/src/components/watch/WatchSlotRow.vue b/frontend/src/components/watch/WatchSlotRow.vue
index fd3ff2c4..083d1a64 100644
--- a/frontend/src/components/watch/WatchSlotRow.vue
+++ b/frontend/src/components/watch/WatchSlotRow.vue
@@ -6,10 +6,11 @@ import WatchProcessDrawer from '@/components/watch/WatchProcessDrawer.vue'
 import WatchSlotPickDialog from '@/components/watch/WatchSlotPickDialog.vue'
 import { useWatchPins, type WatchSlot } from '@/composables/useWatchPins'
 import { useSnackbar } from '@/composables/useSnackbar'
+import { formatApiError } from '@/utils/apiError'
 
 const router = useRouter()
 const snackbar = useSnackbar()
-const { slots, loading, refreshPins, removeSlot, pinServer } = useWatchPins()
+const { slots, loading, refreshPins, removeSlot, pinServer, setSlotMonitoring, setSlotTtl } = useWatchPins()
 
 const processDrawer = ref(false)
 const processSlot = ref<WatchSlot | null>(null)
@@ -22,7 +23,32 @@ onMounted(() => {
 })
 
 async function onRemove(slotIndex: number) {
-  await removeSlot(slotIndex)
+  try {
+    await removeSlot(slotIndex)
+    snackbar(`已移除监测 · 槽 ${slotIndex + 1}`, 'success')
+  } catch (e: unknown) {
+    snackbar(formatApiError(e, '移除监测失败'), 'error')
+  }
+}
+
+async function onMonitoring(slotIndex: number, enabled: boolean) {
+  try {
+    await setSlotMonitoring(slotIndex, enabled)
+    snackbar(enabled ? `已开启实时监测 · 槽 ${slotIndex + 1}` : `已暂停实时监测 · 槽 ${slotIndex + 1}`, 'success')
+  } catch (e: unknown) {
+    snackbar(formatApiError(e, '更新监测开关失败'), 'error')
+  }
+}
+
+async function onTtl(slotIndex: number, hours: 8 | 24) {
+  const slot = slots.value.find((s) => s.slot_index === slotIndex)
+  if (!slot || slot.empty || slot.ttl_hours === hours) return
+  try {
+    await setSlotTtl(slotIndex, hours)
+    snackbar(`监测时长已设为 ${hours} 小时 · 槽 ${slotIndex + 1}`, 'success')
+  } catch (e: unknown) {
+    snackbar(formatApiError(e, '更新监测时长失败'), 'error')
+  }
 }
 
 function openProcesses(slot: WatchSlot) {
@@ -68,7 +94,7 @@ async function onPickServer(serverId: number) {
   <div class="watch-slot-row mb-4">
     <div class="d-flex align-center mb-2">
       <span class="text-subtitle-2">实时监测</span>
-      <v-chip size="x-small" variant="tonal" class="ml-2" label>最多 4 台 · 8h</v-chip>
+      <v-chip size="x-small" variant="tonal" class="ml-2" label>最多 4 台 · 默认 8h · 暂停不占 TTL</v-chip>
       <v-spacer />
       <v-btn size="small" variant="text" prepend-icon="mdi-history" :to="{ name: 'WatchMetrics' }">
         监测历史
@@ -83,6 +109,8 @@ async function onPickServer(serverId: number) {
           @processes="openProcesses"
           @history="openHistory"
           @pick="onPickSlot"
+          @monitoring="onMonitoring"
+          @ttl="onTtl"
         />
       </v-col>
     </v-row>
diff --git a/frontend/src/composables/useWatchPins.ts b/frontend/src/composables/useWatchPins.ts
index d64189bb..5c61392b 100644
--- a/frontend/src/composables/useWatchPins.ts
+++ b/frontend/src/composables/useWatchPins.ts
@@ -48,6 +48,8 @@ export interface WatchSlot {
   pinned_at?: string
   expires_at?: string
   remaining_sec?: number
+  monitoring_enabled?: boolean
+  ttl_hours?: 8 | 24
   metrics?: WatchMetrics | null
   sparkline?: WatchSparkPoint[]
   processes?: WatchProcess[]
@@ -73,34 +75,38 @@ function applySlots(data: { slots?: WatchSlot[] }) {
 }
 
 function tickCountdown() {
+  let shouldRefresh = false
   for (const slot of slots.value) {
-    if (!slot.empty && slot.remaining_sec != null && slot.remaining_sec > 0) {
+    if (slot.empty || slot.monitoring_enabled === false) continue
+    if (slot.remaining_sec != null && slot.remaining_sec > 0) {
       slot.remaining_sec -= 1
       if (slot.remaining_sec <= 0) {
-        slot.empty = true
+        shouldRefresh = true
       }
     }
   }
+  if (shouldRefresh) {
+    void refreshPins()
+  }
 }
 
 function mergeMetrics(serverId: number, metrics: WatchMetrics) {
   for (const slot of slots.value) {
-    if (!slot.empty && slot.server_id === serverId) {
-      slot.metrics = { ...(slot.metrics || {}), ...metrics }
-      if (metrics.processes?.length) {
-        slot.processes = metrics.processes
-      }
-      const point: WatchSparkPoint = {
-        ts: metrics.ts,
-        cpu_pct: metrics.cpu_pct,
-        mem_pct: metrics.mem_pct,
-        disk_pct: metrics.disk_pct,
-        net_down_bps: metrics.net_down_bps,
-      }
-      if (!slot.sparkline) slot.sparkline = []
-      slot.sparkline.push(point)
-      if (slot.sparkline.length > 180) slot.sparkline.shift()
+    if (slot.empty || slot.server_id !== serverId || slot.monitoring_enabled === false) continue
+    slot.metrics = { ...(slot.metrics || {}), ...metrics }
+    if (metrics.processes?.length) {
+      slot.processes = metrics.processes
     }
+    const point: WatchSparkPoint = {
+      ts: metrics.ts,
+      cpu_pct: metrics.cpu_pct,
+      mem_pct: metrics.mem_pct,
+      disk_pct: metrics.disk_pct,
+      net_down_bps: metrics.net_down_bps,
+    }
+    if (!slot.sparkline) slot.sparkline = []
+    slot.sparkline.push(point)
+    if (slot.sparkline.length > 180) slot.sparkline.shift()
   }
 }
 
@@ -182,6 +188,24 @@ async function removeSlot(slotIndex: number) {
   applySlots(data)
 }
 
+async function setSlotMonitoring(slotIndex: number, monitoringEnabled: boolean) {
+  const data = await http.patch<{ slots: WatchSlot[] }>(
+    `/watch/pins/${slotIndex}/monitoring`,
+    { monitoring_enabled: monitoringEnabled },
+  )
+  applySlots(data)
+}
+
+export type WatchTtlHours = 8 | 24
+
+async function setSlotTtl(slotIndex: number, ttlHours: WatchTtlHours) {
+  const data = await http.patch<{ slots: WatchSlot[] }>(
+    `/watch/pins/${slotIndex}/ttl`,
+    { ttl_hours: ttlHours },
+  )
+  applySlots(data)
+}
+
 export function useWatchPins() {
   consumerCount += 1
   if (consumerCount === 1) {
@@ -223,5 +247,7 @@ export function useWatchPins() {
     refreshPins,
     pinServer,
     removeSlot,
+    setSlotMonitoring,
+    setSlotTtl,
   }
 }
diff --git a/frontend/src/utils/watchFormat.ts b/frontend/src/utils/watchFormat.ts
index 18527995..d4a365ba 100644
--- a/frontend/src/utils/watchFormat.ts
+++ b/frontend/src/utils/watchFormat.ts
@@ -15,8 +15,97 @@ export function formatRemaining(sec: number | null | undefined): string {
   return `${m}m ${sec % 60}s`
 }
 
+const PROBE_STATUS_LABELS: Record<string, string> = {
+  ok: '正常',
+  parse_error: '探针解析失败',
+  ssh_timeout: 'SSH 超时',
+  ssh_auth: 'SSH 认证失败',
+  no_cred: '无凭据',
+  redis_stale: 'Agent 心跳过期',
+  offline: '离线',
+}
+
+const PROBE_ERROR_EXACT: Record<string, string> = {
+  parse_error: '探针返回数据无法解析',
+  'psutil missing': '子机未安装 psutil（请执行 pip install psutil）',
+  ssh_probe_failed: 'SSH 探针脚本执行失败',
+  'SSH watch probe failed': 'SSH 监测探针失败',
+  'SSH probe failed': 'SSH 探针失败',
+  timeout: '连接超时',
+  '探针失败': '探针失败',
+  '无 Agent 且 SSH 探针失败': '无 Agent 且 SSH 探针失败',
+  '服务器不存在': '服务器不存在',
+}
+
+/** Probe status code → Chinese label. */
+export function probeStatusLabel(status: string | null | undefined): string {
+  if (!status || status === 'ok') return PROBE_STATUS_LABELS.ok
+  if (PROBE_STATUS_LABELS[status]) return PROBE_STATUS_LABELS[status]
+  if (status.startsWith('parse_error')) return PROBE_STATUS_LABELS.parse_error
+  return status
+}
+
+/** Probe source code → Chinese label. */
+export function probeSourceLabel(source: string | null | undefined): string {
+  if (!source) return '—'
+  const map: Record<string, string> = {
+    redis: 'Agent',
+    ssh: 'SSH',
+    mixed: 'Agent+SSH',
+  }
+  return map[source] ?? source
+}
+
+/** Error detail → Chinese (covers legacy English rows in DB). */
+export function formatProbeError(
+  error: string | null | undefined,
+  status?: string | null,
+): string {
+  if (!error?.trim()) {
+    if (status && status !== 'ok') return probeStatusLabel(status)
+    return '—'
+  }
+
+  const text = error.trim()
+  if (PROBE_ERROR_EXACT[text]) return PROBE_ERROR_EXACT[text]
+
+  const lower = text.toLowerCase()
+  if (lower.startsWith('parse_error')) {
+    const detail = text.includes(':') ? text.split(':').slice(1).join(':').trim() : ''
+    if (detail && PROBE_ERROR_EXACT[detail]) {
+      return `探针返回数据无法解析：${PROBE_ERROR_EXACT[detail]}`
+    }
+    if (detail) return `探针返回数据无法解析：${detail}`
+    return PROBE_ERROR_EXACT.parse_error
+  }
+  if (lower.includes('timed out') || lower.endsWith('timeout')) {
+    return `SSH 连接超时：${text}`
+  }
+  if (lower.includes('permission denied') || lower.includes('authentication failed')) {
+    return `SSH 认证失败：${text}`
+  }
+  if (lower.includes('psutil missing')) {
+    return PROBE_ERROR_EXACT['psutil missing']
+  }
+  if (lower.includes('ssh_probe_failed') || lower.includes('ssh watch probe failed')) {
+    return PROBE_ERROR_EXACT.ssh_probe_failed
+  }
+  if (/[\u4e00-\u9fff]/.test(text)) return text
+  return `探针异常：${text}`
+}
+
 export function probeStatusColor(status: string | null | undefined): string {
   if (!status || status === 'ok') return 'success'
   if (status.includes('timeout') || status.includes('auth')) return 'warning'
   return 'error'
 }
+
+/** Status filter options for probe records table. */
+export const PROBE_STATUS_FILTER_ITEMS = [
+  { title: '全部状态', value: null as string | null },
+  { title: '正常', value: 'ok' },
+  { title: 'SSH 超时', value: 'ssh_timeout' },
+  { title: '探针解析失败', value: 'parse_error' },
+  { title: '无凭据', value: 'no_cred' },
+  { title: '离线', value: 'offline' },
+]
diff --git a/server/api/watch.py b/server/api/watch.py
index 3832ed4a..1e16cb4d 100644
--- a/server/api/watch.py
+++ b/server/api/watch.py
@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+from typing import Literal
+
 from fastapi import APIRouter, Depends, HTTPException, Query, Request
 from pydantic import BaseModel, Field
 
@@ -9,6 +11,7 @@ from server.api.auth_jwt import get_current_admin
 from server.api.dependencies import get_db
 from server.application.services.watch_service import SlotsFullError, WatchService
 from server.domain.models import Admin
+from server.utils.watch_metrics import WATCH_PIN_TTL_HOURS
 from sqlalchemy.ext.asyncio import AsyncSession
 
 router = APIRouter(prefix="/api/watch", tags=["watch"])
@@ -18,12 +21,24 @@ class WatchPinCreate(BaseModel):
     server_id: int = Field(..., gt=0)
     slot_index: int | None = Field(None, ge=0, le=3)
     replace_slot: int | None = Field(None, ge=0, le=3, description="监测已满时指定替换槽位")
+    ttl_hours: Literal[8, 24] = Field(
+        WATCH_PIN_TTL_HOURS,
+        description="监测窗口时长，默认 8 小时；24 小时需显式指定",
+    )
 
 
 class WatchPinReplace(BaseModel):
     server_id: int = Field(..., gt=0)
 
 
+class WatchPinMonitoringUpdate(BaseModel):
+    monitoring_enabled: bool = Field(..., description="是否开启此槽位实时监测")
+
+
+class WatchPinTtlUpdate(BaseModel):
+    ttl_hours: Literal[8, 24] = Field(..., description="监测窗口时长：8 或 24 小时")
+
+
 def _client_ip(request: Request) -> str:
     return request.client.host if request.client else ""
 
@@ -51,6 +66,7 @@ async def create_watch_pin(
             server_id=payload.server_id,
             slot_index=payload.slot_index,
             replace_slot=payload.replace_slot,
+            ttl_hours=payload.ttl_hours,
             ip_address=_client_ip(request),
         )
     except SlotsFullError as e:
@@ -97,6 +113,46 @@ async def delete_watch_pin(
         raise HTTPException(status_code=404, detail=str(e)) from e
 
 
+@router.patch("/pins/{slot_index}/monitoring")
+async def update_watch_pin_monitoring(
+    slot_index: int,
+    payload: WatchPinMonitoringUpdate,
+    request: Request,
+    admin: Admin = Depends(get_current_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    svc = WatchService(db)
+    try:
+        return await svc.set_slot_monitoring(
+            admin=admin,
+            slot_index=slot_index,
+            monitoring_enabled=payload.monitoring_enabled,
+            ip_address=_client_ip(request),
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e)) from e
+
+
+@router.patch("/pins/{slot_index}/ttl")
+async def update_watch_pin_ttl(
+    slot_index: int,
+    payload: WatchPinTtlUpdate,
+    request: Request,
+    admin: Admin = Depends(get_current_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    svc = WatchService(db)
+    try:
+        return await svc.set_slot_ttl(
+            admin=admin,
+            slot_index=slot_index,
+            ttl_hours=payload.ttl_hours,
+            ip_address=_client_ip(request),
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e)) from e
+
+
 @router.get("/metrics")
 async def get_watch_metrics(
     server_ids: str = Query(..., description="逗号分隔 server_id"),
diff --git a/server/application/services/watch_service.py b/server/application/services/watch_service.py
index c1f80fd8..17d6b589 100644
--- a/server/application/services/watch_service.py
+++ b/server/application/services/watch_service.py
@@ -13,7 +13,13 @@ from server.infrastructure.database.audit_log_repo import AuditLogRepositoryImpl
 from server.infrastructure.database.server_repo import ServerRepositoryImpl
 from server.infrastructure.database.watch_repo import WatchRepositoryImpl
 from server.infrastructure.redis.client import get_redis
-from server.utils.watch_metrics import WATCH_MAX_SLOTS, WATCH_PIN_TTL_HOURS, server_can_be_watched
+from server.utils.watch_state import clear_watch_redis_snapshot
+from server.utils.watch_metrics import (
+    WATCH_MAX_SLOTS,
+    WATCH_PIN_TTL_HOURS,
+    normalize_watch_ttl_hours,
+    server_can_be_watched,
+)
 
 REDIS_WATCH_LIVE_PREFIX = "watch:live:"
 REDIS_WATCH_PROC_PREFIX = "watch:proc:"
@@ -67,6 +73,23 @@ async def _load_processes(server_id: int) -> list[dict[str, Any]] | None:
         return None
 
 
+async def _restore_idle_agent_watch(watch_repo: WatchRepositoryImpl, server_id: int) -> None:
+    """Stop 5s watch snapshots when no slot actively monitors this server (Agent stays 60s)."""
+    if await watch_repo.count_monitoring_pins_for_server(server_id) == 0:
+        await clear_watch_redis_snapshot(server_id)
+
+
+async def _finalize_due_pins(watch_repo: WatchRepositoryImpl, db: AsyncSession) -> None:
+    """Pause TTL-expired pins on read/write paths (probe loop also runs this every 5s)."""
+    expired_servers = await watch_repo.expire_due_pins()
+    if not expired_servers:
+        return
+    for server_id in expired_servers:
+        if await watch_repo.count_monitoring_pins_for_server(server_id) == 0:
+            await clear_watch_redis_snapshot(server_id)
+    await db.commit()
+
+
 async def _slot_payload(
     *,
     slot_index: int,
@@ -74,11 +97,17 @@ async def _slot_payload(
 ) -> dict[str, Any]:
     if not pin_row:
         return {"slot_index": slot_index, "empty": True}
-    metrics = await _load_live_metrics(pin_row["server_id"])
-    sparkline = await _load_sparkline(pin_row["server_id"]) if pin_row else []
-    processes = await _load_processes(pin_row["server_id"])
-    if metrics and processes:
-        metrics = {**metrics, "processes": processes}
+    monitoring_enabled = pin_row.get("monitoring_enabled", True)
+    metrics = None
+    sparkline: list[dict[str, Any]] = []
+    processes = None
+    if monitoring_enabled:
+        metrics = await _load_live_metrics(pin_row["server_id"])
+        sparkline = await _load_sparkline(pin_row["server_id"])
+        processes = await _load_processes(pin_row["server_id"])
+        if metrics and processes:
+            metrics = {**metrics, "processes": processes}
+    remaining = _remaining_sec(pin_row["expires_at"]) if monitoring_enabled else None
     return {
         "slot_index": slot_index,
         "empty": False,
@@ -88,7 +117,9 @@ async def _slot_payload(
         "session_id": pin_row["session_id"],
         "pinned_at": pin_row["pinned_at"].isoformat() if pin_row.get("pinned_at") else None,
         "expires_at": pin_row["expires_at"].isoformat() if pin_row.get("expires_at") else None,
-        "remaining_sec": _remaining_sec(pin_row["expires_at"]),
+        "remaining_sec": remaining,
+        "monitoring_enabled": monitoring_enabled,
+        "ttl_hours": int(pin_row.get("ttl_hours") or WATCH_PIN_TTL_HOURS),
         "metrics": metrics,
         "sparkline": sparkline,
         "processes": processes,
@@ -103,6 +134,7 @@ class WatchService:
         self.audit_repo = AuditLogRepositoryImpl(db)
 
     async def list_slots(self, admin_id: int) -> dict[str, Any]:
+        await _finalize_due_pins(self.watch_repo, self.db)
         pins = await self.watch_repo.list_active_pins_for_admin(admin_id)
         by_slot = {p["slot_index"]: p for p in pins}
         slots = [
@@ -118,8 +150,11 @@ class WatchService:
         server_id: int,
         slot_index: int | None = None,
         replace_slot: int | None = None,
+        ttl_hours: int = WATCH_PIN_TTL_HOURS,
         ip_address: str = "",
     ) -> dict[str, Any]:
+        await _finalize_due_pins(self.watch_repo, self.db)
+        hours = normalize_watch_ttl_hours(ttl_hours)
         server = await self.server_repo.get_by_id(server_id)
         if not server:
             raise ValueError("服务器不存在")
@@ -130,12 +165,12 @@ class WatchService:
 
         existing = await self.watch_repo.get_pin_by_server(admin.id, server_id)
         if existing:
-            await self.watch_repo.reset_pin_ttl(admin.id, server_id, WATCH_PIN_TTL_HOURS)
+            await self.watch_repo.reset_pin_ttl(admin.id, server_id, hours)
             await self._audit(
                 admin=admin,
                 action="watch_pin_add",
                 server=server,
-                detail=f"重置监测 8h · 槽 {existing.slot_index + 1}",
+                detail=f"重置监测 {hours}h · 槽 {existing.slot_index + 1}",
                 ip_address=ip_address,
             )
             await self.db.commit()
@@ -146,13 +181,13 @@ class WatchService:
                 admin_id=admin.id,
                 slot_index=slot_index,
                 server_id=server_id,
-                ttl_hours=WATCH_PIN_TTL_HOURS,
+                ttl_hours=hours,
             )
             await self._audit(
                 admin=admin,
                 action="watch_pin_replace" if replace_slot is not None else "watch_pin_add",
                 server=server,
-                detail=f"加入监测 · 槽 {slot_index + 1}",
+                detail=f"加入监测 · 槽 {slot_index + 1} · {hours}h",
                 ip_address=ip_address,
             )
             await self.db.commit()
@@ -164,13 +199,13 @@ class WatchService:
                 admin_id=admin.id,
                 server_id=server_id,
                 slot_index=empty,
-                ttl_hours=WATCH_PIN_TTL_HOURS,
+                ttl_hours=hours,
             )
             await self._audit(
                 admin=admin,
                 action="watch_pin_add",
                 server=server,
-                detail=f"加入监测 · 槽 {empty + 1}",
+                detail=f"加入监测 · 槽 {empty + 1} · {hours}h",
                 ip_address=ip_address,
             )
             await self.db.commit()
@@ -181,13 +216,13 @@ class WatchService:
                 admin_id=admin.id,
                 slot_index=replace_slot,
                 server_id=server_id,
-                ttl_hours=WATCH_PIN_TTL_HOURS,
+                ttl_hours=hours,
             )
             await self._audit(
                 admin=admin,
                 action="watch_pin_replace",
                 server=server,
-                detail=f"替换监测 · 槽 {replace_slot + 1}",
+                detail=f"替换监测 · 槽 {replace_slot + 1} · {hours}h",
                 ip_address=ip_address,
             )
             await self.db.commit()
@@ -203,6 +238,7 @@ class WatchService:
         server_id: int,
         ip_address: str = "",
     ) -> dict[str, Any]:
+        await _finalize_due_pins(self.watch_repo, self.db)
         if slot_index < 0 or slot_index >= WATCH_MAX_SLOTS:
             raise ValueError("槽位无效")
         server = await self.server_repo.get_by_id(server_id)
@@ -215,17 +251,19 @@ class WatchService:
         if other and other.slot_index != slot_index:
             await self.watch_repo.end_session(other.session_id, "replaced")
             await self.watch_repo.delete_pin(other.id)
+        existing = await self.watch_repo.get_pin_by_slot(admin.id, slot_index)
+        slot_ttl = normalize_watch_ttl_hours(int(existing.ttl_hours or 8)) if existing else WATCH_PIN_TTL_HOURS
         await self.watch_repo.replace_pin_server(
             admin_id=admin.id,
             slot_index=slot_index,
             server_id=server_id,
-            ttl_hours=WATCH_PIN_TTL_HOURS,
+            ttl_hours=slot_ttl,
         )
         await self._audit(
             admin=admin,
             action="watch_pin_replace",
             server=server,
-            detail=f"替换监测 · 槽 {slot_index + 1}",
+            detail=f"替换监测 · 槽 {slot_index + 1} · {slot_ttl}h",
             ip_address=ip_address,
         )
         await self.db.commit()
@@ -238,12 +276,14 @@ class WatchService:
         slot_index: int,
         ip_address: str = "",
     ) -> dict[str, Any]:
+        await _finalize_due_pins(self.watch_repo, self.db)
         if slot_index < 0 or slot_index >= WATCH_MAX_SLOTS:
             raise ValueError("槽位无效")
         pin = await self.watch_repo.remove_pin_by_slot(admin.id, slot_index)
         if not pin:
             raise ValueError("槽位为空")
-        server = await self.server_repo.get_by_id(pin.server_id)
+        server_id = pin.server_id
+        server = await self.server_repo.get_by_id(server_id)
         await self._audit(
             admin=admin,
             action="watch_pin_remove",
@@ -252,6 +292,71 @@ class WatchService:
             ip_address=ip_address,
         )
         await self.db.commit()
+        await _restore_idle_agent_watch(self.watch_repo, server_id)
+        return await self.list_slots(admin.id)
+
+    async def set_slot_monitoring(
+        self,
+        *,
+        admin: Admin,
+        slot_index: int,
+        monitoring_enabled: bool,
+        ip_address: str = "",
+    ) -> dict[str, Any]:
+        await _finalize_due_pins(self.watch_repo, self.db)
+        if slot_index < 0 or slot_index >= WATCH_MAX_SLOTS:
+            raise ValueError("槽位无效")
+        pin = await self.watch_repo.set_monitoring_enabled(
+            admin.id,
+            slot_index,
+            monitoring_enabled,
+        )
+        if not pin:
+            raise ValueError("槽位为空")
+        server = await self.server_repo.get_by_id(pin.server_id)
+        hours = int(pin.ttl_hours or WATCH_PIN_TTL_HOURS)
+        action = "watch_pin_resume" if monitoring_enabled else "watch_pin_pause"
+        detail = (
+            f"开启实时监测 · 槽 {slot_index + 1} · 重置 {hours}h"
+            if monitoring_enabled
+            else f"暂停实时监测 · 槽 {slot_index + 1} · 恢复 Agent 60s"
+        )
+        await self._audit(
+            admin=admin,
+            action=action,
+            server=server,
+            detail=detail,
+            ip_address=ip_address,
+        )
+        await self.db.commit()
+        if not monitoring_enabled:
+            await _restore_idle_agent_watch(self.watch_repo, pin.server_id)
+        return await self.list_slots(admin.id)
+
+    async def set_slot_ttl(
+        self,
+        *,
+        admin: Admin,
+        slot_index: int,
+        ttl_hours: int,
+        ip_address: str = "",
+    ) -> dict[str, Any]:
+        await _finalize_due_pins(self.watch_repo, self.db)
+        if slot_index < 0 or slot_index >= WATCH_MAX_SLOTS:
+            raise ValueError("槽位无效")
+        hours = normalize_watch_ttl_hours(ttl_hours)
+        pin = await self.watch_repo.set_pin_ttl_hours(admin.id, slot_index, hours)
+        if not pin:
+            raise ValueError("槽位为空")
+        server = await self.server_repo.get_by_id(pin.server_id)
+        await self._audit(
+            admin=admin,
+            action="watch_pin_ttl",
+            server=server,
+            detail=f"监测时长 · 槽 {slot_index + 1} · {hours}h",
+            ip_address=ip_address,
+        )
+        await self.db.commit()
         return await self.list_slots(admin.id)
 
     async def get_live_for_servers(self, server_ids: list[int]) -> dict[str, Any]:
diff --git a/server/background/watch_probe_runner.py b/server/background/watch_probe_runner.py
index 6cf3bbf2..d3e83da4 100644
--- a/server/background/watch_probe_runner.py
+++ b/server/background/watch_probe_runner.py
@@ -17,6 +17,8 @@ from server.infrastructure.database.watch_repo import WatchRepositoryImpl
 from server.infrastructure.redis.client import get_redis
 from server.infrastructure.ssh.remote_probe import ssh_watch_probe, ssh_watch_processes
 from server.utils.watch_alerts import process_watch_probe_alerts
+from server.utils.watch_probe_errors import watch_probe_error_zh
+from server.utils.watch_state import clear_watch_redis_snapshot
 from server.utils.watch_metrics import (
     WATCH_PROBE_INTERVAL_SEC,
     WATCH_PROBE_TIMEOUT_SEC,
@@ -29,6 +31,7 @@ from server.utils.watch_metrics import (
     parse_redis_watch_payload,
     parse_ssh_watch_payload,
     redis_sample_has_io,
+    redis_sample_has_basic_metrics,
 )
 
 logger = logging.getLogger("nexus.watch_probe")
@@ -118,9 +121,17 @@ async def probe_server_metrics(
     if heartbeat and _heartbeat_fresh(heartbeat):
         redis_sample = parse_redis_watch_payload(heartbeat)
 
-    # M3: skip SSH when Agent heartbeat already carries full IO counters
-    if redis_sample_has_io(redis_sample):
-        sample = redis_sample  # type: ignore[assignment]
+    if redis_sample is not None and redis_sample_has_io(redis_sample):
+        sample = redis_sample
+    elif redis_sample is not None and redis_sample_has_basic_metrics(redis_sample):
+        # Agent CPU/mem available — SSH only supplements IO; SSH failure must not block display
+        ssh_result = await ssh_watch_probe(server, timeout=WATCH_PROBE_TIMEOUT_SEC)
+        if ssh_result.get("ok"):
+            ssh_sample = parse_ssh_watch_payload(ssh_result["payload"])
+            ssh_sample.duration_ms = int(ssh_result.get("duration_ms") or 0)
+            sample = merge_redis_and_ssh(redis_sample, ssh_sample)
+        else:
+            sample = redis_sample
     else:
         ssh_result = await ssh_watch_probe(server, timeout=WATCH_PROBE_TIMEOUT_SEC)
         if ssh_result.get("ok"):
@@ -139,13 +150,16 @@ async def probe_server_metrics(
                 return failure_sample(
                     status="no_cred",
                     source="ssh",
-                    error=ssh_result.get("error") or "无 Agent 且 SSH 探针失败",
+                    error=watch_probe_error_zh(
+                        ssh_result.get("error") or "无 Agent 且 SSH 探针失败",
+                        status="no_cred",
+                    ) or "无 Agent 且 SSH 探针失败",
                     duration_ms=int(ssh_result.get("duration_ms") or 0),
                 )
             return failure_sample(
                 status=status,
                 source="ssh",
-                error=ssh_result.get("error") or "探针失败",
+                error=watch_probe_error_zh(ssh_result.get("error") or "探针失败", status=status) or "探针失败",
                 duration_ms=int(ssh_result.get("duration_ms") or 0),
             )
 
@@ -161,8 +175,11 @@ async def _run_probe_cycle() -> None:
     async with AsyncSessionLocal() as db:
         watch_repo = WatchRepositoryImpl(db)
         server_repo = ServerRepositoryImpl(db)
-        await watch_repo.expire_due_pins()
-        pins = await watch_repo.list_active_pins_all()
+        expired_servers = await watch_repo.expire_due_pins()
+        for server_id in expired_servers:
+            if await watch_repo.count_monitoring_pins_for_server(server_id) == 0:
+                await clear_watch_redis_snapshot(server_id)
+        pins = await watch_repo.list_active_pins_all(monitoring_only=True)
         if not pins:
             await db.commit()
             return
diff --git a/server/domain/models/__init__.py b/server/domain/models/__init__.py
index 7c310996..258d9ede 100644
--- a/server/domain/models/__init__.py
+++ b/server/domain/models/__init__.py
@@ -183,6 +183,18 @@ class WatchPin(Base):
     server_id = Column(Integer, ForeignKey("servers.id", ondelete="CASCADE"), nullable=False)
     pinned_at = Column(DateTime, nullable=False, comment="UTC naive")
     expires_at = Column(DateTime, nullable=False, comment="UTC naive")
+    monitoring_enabled = Column(
+        Boolean,
+        nullable=False,
+        default=True,
+        comment="是否开启实时探针(关闭时保留槽位、暂停倒计时)",
+    )
+    ttl_hours = Column(
+        Integer,
+        nullable=False,
+        default=8,
+        comment="监测窗口时长(小时)，仅允许 8 或 24",
+    )
 
     __table_args__ = (
         Index("uq_watch_pins_admin_slot", "admin_id", "slot_index", unique=True),
diff --git a/server/infrastructure/database/migrations.py b/server/infrastructure/database/migrations.py
index 83eb747c..8280c22f 100644
--- a/server/infrastructure/database/migrations.py
+++ b/server/infrastructure/database/migrations.py
@@ -239,6 +239,8 @@ async def run_schema_migrations():
           `server_id` INT NOT NULL,
           `pinned_at` DATETIME NOT NULL,
           `expires_at` DATETIME NOT NULL,
+          `monitoring_enabled` TINYINT(1) NOT NULL DEFAULT 1 COMMENT '是否开启实时探针',
+          `ttl_hours` INT NOT NULL DEFAULT 8 COMMENT '监测窗口时长(小时) 8|24',
           UNIQUE KEY `uq_watch_pins_admin_slot` (`admin_id`, `slot_index`),
           UNIQUE KEY `uq_watch_pins_admin_server` (`admin_id`, `server_id`),
           INDEX `idx_watch_pins_expires` (`expires_at`),
@@ -281,6 +283,8 @@ async def run_schema_migrations():
           CONSTRAINT `fk_watch_probe_admin` FOREIGN KEY (`admin_id`) REFERENCES `admins` (`id`) ON DELETE CASCADE
         ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4""",
         "ALTER TABLE `watch_probe_records` ADD COLUMN `processes_json` JSON NULL COMMENT 'Top5 processes snapshot'",
+        "ALTER TABLE `watch_pins` ADD COLUMN `monitoring_enabled` TINYINT(1) NOT NULL DEFAULT 1 COMMENT '是否开启实时探针'",
+        "ALTER TABLE `watch_pins` ADD COLUMN `ttl_hours` INT NOT NULL DEFAULT 8 COMMENT '监测窗口时长(小时) 8|24'",
     ]
     async with AsyncSessionLocal() as session:
         for sql in migrations:
diff --git a/server/infrastructure/database/watch_repo.py b/server/infrastructure/database/watch_repo.py
index e99aab20..41a45095 100644
--- a/server/infrastructure/database/watch_repo.py
+++ b/server/infrastructure/database/watch_repo.py
@@ -5,16 +5,24 @@ from __future__ import annotations
 from datetime import datetime, timedelta, timezone
 from typing import Any
 
-from sqlalchemy import delete, func, select
+from sqlalchemy import delete, func, or_, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from server.domain.models import Server, WatchPin, WatchPinSession, WatchProbeRecord
+from server.utils.watch_metrics import normalize_watch_ttl_hours
 
 
 def _utc_naive_now() -> datetime:
     return datetime.now(timezone.utc).replace(tzinfo=None)
 
 
+def _pin_still_occupied(pin: WatchPin, now: datetime) -> bool:
+    """Pin occupies a slot until manual remove or TTL expiry while monitoring is on."""
+    if not pin.monitoring_enabled:
+        return True
+    return pin.expires_at > now
+
+
 class WatchRepositoryImpl:
     def __init__(self, session: AsyncSession):
         self.session = session
@@ -25,12 +33,17 @@ class WatchRepositoryImpl:
             select(WatchPin, WatchPinSession, Server.name)
             .join(WatchPinSession, WatchPin.session_id == WatchPinSession.id)
             .join(Server, WatchPin.server_id == Server.id)
-            .where(WatchPin.admin_id == admin_id, WatchPin.expires_at > now)
+            .where(
+                WatchPin.admin_id == admin_id,
+                or_(WatchPin.monitoring_enabled.is_(False), WatchPin.expires_at > now),
+            )
             .order_by(WatchPin.slot_index)
         )
         rows = (await self.session.execute(q)).all()
         out: list[dict[str, Any]] = []
         for pin, sess, server_name in rows:
+            if not _pin_still_occupied(pin, now):
+                continue
             out.append(
                 {
                     "pin_id": pin.id,
@@ -40,46 +53,55 @@ class WatchRepositoryImpl:
                     "session_id": sess.id,
                     "pinned_at": pin.pinned_at,
                     "expires_at": pin.expires_at,
+                    "monitoring_enabled": bool(pin.monitoring_enabled),
+                    "ttl_hours": int(pin.ttl_hours or 8),
                 }
             )
         return out
 
-    async def list_active_pins_all(self) -> list[dict[str, Any]]:
+    async def list_active_pins_all(self, *, monitoring_only: bool = False) -> list[dict[str, Any]]:
         now = _utc_naive_now()
         q = (
             select(WatchPin, WatchPinSession)
             .join(WatchPinSession, WatchPin.session_id == WatchPinSession.id)
-            .where(WatchPin.expires_at > now)
         )
         rows = (await self.session.execute(q)).all()
-        return [
-            {
-                "pin_id": pin.id,
-                "admin_id": pin.admin_id,
-                "slot_index": pin.slot_index,
-                "server_id": pin.server_id,
-                "session_id": sess.id,
-            }
-            for pin, sess in rows
-        ]
+        out: list[dict[str, Any]] = []
+        for pin, sess in rows:
+            if not _pin_still_occupied(pin, now):
+                continue
+            if monitoring_only and not pin.monitoring_enabled:
+                continue
+            out.append(
+                {
+                    "pin_id": pin.id,
+                    "admin_id": pin.admin_id,
+                    "slot_index": pin.slot_index,
+                    "server_id": pin.server_id,
+                    "session_id": sess.id,
+                }
+            )
+        return out
 
     async def get_pin_by_slot(self, admin_id: int, slot_index: int) -> WatchPin | None:
-        now = _utc_naive_now()
         q = select(WatchPin).where(
             WatchPin.admin_id == admin_id,
             WatchPin.slot_index == slot_index,
-            WatchPin.expires_at > now,
         )
-        return (await self.session.execute(q)).scalar_one_or_none()
+        pin = (await self.session.execute(q)).scalar_one_or_none()
+        if pin and _pin_still_occupied(pin, _utc_naive_now()):
+            return pin
+        return None
 
     async def get_pin_by_server(self, admin_id: int, server_id: int) -> WatchPin | None:
-        now = _utc_naive_now()
         q = select(WatchPin).where(
             WatchPin.admin_id == admin_id,
             WatchPin.server_id == server_id,
-            WatchPin.expires_at > now,
         )
-        return (await self.session.execute(q)).scalar_one_or_none()
+        pin = (await self.session.execute(q)).scalar_one_or_none()
+        if pin and _pin_still_occupied(pin, _utc_naive_now()):
+            return pin
+        return None
 
     async def create_pin(
         self,
@@ -90,7 +112,8 @@ class WatchRepositoryImpl:
         ttl_hours: int = 8,
     ) -> dict[str, Any]:
         now = _utc_naive_now()
-        expires = now + timedelta(hours=ttl_hours)
+        hours = normalize_watch_ttl_hours(ttl_hours)
+        expires = now + timedelta(hours=hours)
         sess = WatchPinSession(
             admin_id=admin_id,
             server_id=server_id,
@@ -106,6 +129,8 @@ class WatchRepositoryImpl:
             server_id=server_id,
             pinned_at=now,
             expires_at=expires,
+            monitoring_enabled=True,
+            ttl_hours=hours,
         )
         self.session.add(pin)
         await self.session.flush()
@@ -116,6 +141,7 @@ class WatchRepositoryImpl:
             "server_id": server_id,
             "pinned_at": now,
             "expires_at": expires,
+            "ttl_hours": hours,
         }
 
     async def end_session(self, session_id: int, reason: str) -> None:
@@ -159,34 +185,101 @@ class WatchRepositoryImpl:
             ttl_hours=ttl_hours,
         )
 
-    async def reset_pin_ttl(self, admin_id: int, server_id: int, ttl_hours: int = 8) -> dict[str, Any]:
-        """Re-pin same server: end old session and start fresh 8h window."""
+    async def reset_pin_ttl(self, admin_id: int, server_id: int, ttl_hours: int | None = None) -> dict[str, Any]:
+        """Re-pin same server: end old session and start fresh monitoring window."""
         pin = await self.get_pin_by_server(admin_id, server_id)
         if not pin:
             raise ValueError("pin not found")
         slot_index = pin.slot_index
+        hours = normalize_watch_ttl_hours(ttl_hours if ttl_hours is not None else int(pin.ttl_hours or 8))
         await self.end_session(pin.session_id, "replaced")
         await self.delete_pin(pin.id)
         return await self.create_pin(
             admin_id=admin_id,
             server_id=server_id,
             slot_index=slot_index,
-            ttl_hours=ttl_hours,
+            ttl_hours=hours,
         )
 
     async def remove_pin_by_slot(self, admin_id: int, slot_index: int) -> WatchPin | None:
         return await self.delete_pin_by_slot(admin_id, slot_index)
 
+    async def count_monitoring_pins_for_server(self, server_id: int) -> int:
+        q = select(func.count()).select_from(WatchPin).where(
+            WatchPin.server_id == server_id,
+            WatchPin.monitoring_enabled.is_(True),
+        )
+        return int((await self.session.execute(q)).scalar_one() or 0)
+
+    async def _ensure_open_session(self, pin: WatchPin) -> None:
+        q = select(WatchPinSession).where(WatchPinSession.id == pin.session_id)
+        sess = (await self.session.execute(q)).scalar_one_or_none()
+        if sess and sess.ended_at is None:
+            return
+        now = _utc_naive_now()
+        new_sess = WatchPinSession(
+            admin_id=pin.admin_id,
+            server_id=pin.server_id,
+            slot_index=pin.slot_index,
+            started_at=now,
+        )
+        self.session.add(new_sess)
+        await self.session.flush()
+        pin.session_id = new_sess.id
+
+    async def set_monitoring_enabled(
+        self,
+        admin_id: int,
+        slot_index: int,
+        enabled: bool,
+        *,
+        ttl_hours: int | None = None,
+    ) -> WatchPin | None:
+        pin = await self.get_pin_by_slot(admin_id, slot_index)
+        if not pin:
+            return None
+        if ttl_hours is not None:
+            pin.ttl_hours = normalize_watch_ttl_hours(ttl_hours)
+        if enabled:
+            await self._ensure_open_session(pin)
+            hours = normalize_watch_ttl_hours(int(pin.ttl_hours or 8))
+            pin.ttl_hours = hours
+            pin.monitoring_enabled = True
+            pin.expires_at = _utc_naive_now() + timedelta(hours=hours)
+        else:
+            pin.monitoring_enabled = False
+        await self.session.flush()
+        return pin
+
+    async def set_pin_ttl_hours(
+        self,
+        admin_id: int,
+        slot_index: int,
+        ttl_hours: int,
+    ) -> WatchPin | None:
+        pin = await self.get_pin_by_slot(admin_id, slot_index)
+        if not pin:
+            return None
+        hours = normalize_watch_ttl_hours(ttl_hours)
+        pin.ttl_hours = hours
+        if pin.monitoring_enabled:
+            pin.expires_at = _utc_naive_now() + timedelta(hours=hours)
+        await self.session.flush()
+        return pin
+
     async def expire_due_pins(self) -> list[int]:
         now = _utc_naive_now()
-        q = select(WatchPin).where(WatchPin.expires_at <= now)
+        q = select(WatchPin).where(
+            WatchPin.expires_at <= now,
+            WatchPin.monitoring_enabled.is_(True),
+        )
         pins = (await self.session.execute(q)).scalars().all()
-        session_ids: list[int] = []
+        server_ids: list[int] = []
         for pin in pins:
             await self.end_session(pin.session_id, "expired")
-            session_ids.append(pin.session_id)
-            await self.delete_pin(pin.id)
-        return session_ids
+            pin.monitoring_enabled = False
+            server_ids.append(pin.server_id)
+        return server_ids
 
     async def insert_probe_record(self, **fields: Any) -> WatchProbeRecord:
         row = WatchProbeRecord(**fields)
diff --git a/server/infrastructure/ssh/remote_probe.py b/server/infrastructure/ssh/remote_probe.py
index 17b551d5..a71b9ea7 100644
--- a/server/infrastructure/ssh/remote_probe.py
+++ b/server/infrastructure/ssh/remote_probe.py
@@ -1,13 +1,12 @@
 """SSH-based remote health / metrics probe (no Agent HTTP port required)."""
 
 import json
-import logging
 from typing import Any
 
 from server.domain.models import Server
 from server.infrastructure.ssh.asyncssh_pool import exec_ssh_command
 
-logger = logging.getLogger("nexus.remote_probe")
+from server.utils.watch_probe_errors import watch_probe_error_zh
 
 # Emits one JSON line: {"status":"healthy","system_info":{...}}
 SSH_HEALTH_METRICS_CMD = r"""python3 -c "
@@ -49,26 +48,45 @@ print(json.dumps({'status': 'healthy', 'system_info': info}))
 
 
 SSH_WATCH_METRICS_CMD = r"""python3 -c "
-import json, platform
+import json
 try:
     import psutil
 except ImportError:
     print(json.dumps({'status':'error','error':'psutil missing'}))
     raise SystemExit(0)
-load = psutil.getloadavg()
-net = psutil.net_io_counters()
-disk_io = psutil.disk_io_counters()
+try:
+    load = list(psutil.getloadavg())
+except (AttributeError, OSError, NotImplementedError):
+    load = [0.0, 0.0, 0.0]
+try:
+    net = psutil.net_io_counters()
+except Exception:
+    net = None
+try:
+    disk_io = psutil.disk_io_counters()
+except Exception:
+    disk_io = None
+try:
+    cpu = psutil.cpu_percent(interval=0.3)
+    mem = psutil.virtual_memory().percent
+    disk = round(psutil.disk_usage('/').percent, 1)
+except Exception as exc:
+    print(json.dumps({'status':'error','error': str(exc)[:200]}))
+    raise SystemExit(0)
 out = {
     'status': 'ok',
-    'cpu_usage': psutil.cpu_percent(interval=0.3),
-    'mem_usage': psutil.virtual_memory().percent,
-    'disk_usage': round(psutil.disk_usage('/').percent, 1),
+    'cpu_usage': cpu,
+    'mem_usage': mem,
+    'disk_usage': disk,
     'disk_mount': '/',
-    'load_avg': list(load),
-    'net_io': {'bytes_sent': net.bytes_sent, 'bytes_recv': net.bytes_recv},
+    'load_avg': load,
+    'net_io': {
+        'bytes_sent': int(net.bytes_sent) if net else 0,
+        'bytes_recv': int(net.bytes_recv) if net else 0,
+    },
     'disk_io': {
-        'read_bytes': disk_io.read_bytes if disk_io else 0,
-        'write_bytes': disk_io.write_bytes if disk_io else 0,
+        'read_bytes': int(disk_io.read_bytes) if disk_io else 0,
+        'write_bytes': int(disk_io.write_bytes) if disk_io else 0,
     },
 }
 print(json.dumps(out))
@@ -79,20 +97,39 @@ try:
 except ImportError:
     print(json.dumps({'status':'error','error':'psutil missing'}))
     raise SystemExit(0)
-load = psutil.getloadavg()
-net = psutil.net_io_counters()
-disk_io = psutil.disk_io_counters()
+try:
+    load = list(psutil.getloadavg())
+except (AttributeError, OSError, NotImplementedError):
+    load = [0.0, 0.0, 0.0]
+try:
+    net = psutil.net_io_counters()
+except Exception:
+    net = None
+try:
+    disk_io = psutil.disk_io_counters()
+except Exception:
+    disk_io = None
+try:
+    cpu = psutil.cpu_percent(interval=0.3)
+    mem = psutil.virtual_memory().percent
+    disk = round(psutil.disk_usage('/').percent, 1)
+except Exception as exc:
+    print(json.dumps({'status':'error','error': str(exc)[:200]}))
+    raise SystemExit(0)
 out = {
     'status': 'ok',
-    'cpu_usage': psutil.cpu_percent(interval=0.3),
-    'mem_usage': psutil.virtual_memory().percent,
-    'disk_usage': round(psutil.disk_usage('/').percent, 1),
+    'cpu_usage': cpu,
+    'mem_usage': mem,
+    'disk_usage': disk,
     'disk_mount': '/',
-    'load_avg': list(load),
-    'net_io': {'bytes_sent': net.bytes_sent, 'bytes_recv': net.bytes_recv},
+    'load_avg': load,
+    'net_io': {
+        'bytes_sent': int(net.bytes_sent) if net else 0,
+        'bytes_recv': int(net.bytes_recv) if net else 0,
+    },
     'disk_io': {
-        'read_bytes': disk_io.read_bytes if disk_io else 0,
-        'write_bytes': disk_io.write_bytes if disk_io else 0,
+        'read_bytes': int(disk_io.read_bytes) if disk_io else 0,
+        'write_bytes': int(disk_io.write_bytes) if disk_io else 0,
     },
 }
 print(json.dumps(out))
@@ -125,16 +162,32 @@ print(json.dumps({'status':'ok','top_processes': procs[:5]}))
 
 
 def _parse_json_stdout(stdout: str) -> dict[str, Any] | None:
-    for line in reversed(stdout.strip().splitlines()):
+    text = (stdout or "").strip()
+    if not text:
+        return None
+    candidates: list[str] = []
+    for line in reversed(text.splitlines()):
         line = line.strip()
-        if not line.startswith("{"):
+        if not line:
             continue
+        start = line.find("{")
+        if start >= 0:
+            candidates.append(line[start:])
+        elif line.startswith("{"):
+            candidates.append(line)
+    if text.startswith("{"):
+        candidates.append(text)
+    seen: set[str] = set()
+    for chunk in candidates:
+        if chunk in seen:
+            continue
+        seen.add(chunk)
         try:
-            data = json.loads(line)
-            if isinstance(data, dict) and data.get("status"):
-                return data
+            data = json.loads(chunk)
         except json.JSONDecodeError:
             continue
+        if isinstance(data, dict) and data.get("status"):
+            return data
     return None
 
 
@@ -169,17 +222,39 @@ async def ssh_watch_probe(server: Server, timeout: int = 8) -> dict[str, Any]:
     result = await exec_ssh_command(server, SSH_WATCH_METRICS_CMD, timeout=timeout)
     duration_ms = int((time.monotonic() - started) * 1000)
     if result.get("exit_code", -1) != 0:
-        err = (result.get("stderr") or result.get("stdout") or "SSH watch probe failed")[:300]
-        if "timed out" in err.lower() or duration_ms >= timeout * 1000 - 50:
-            return {"ok": False, "probe_status": "ssh_timeout", "error": err, "duration_ms": duration_ms}
-        if "auth" in err.lower() or "permission denied" in err.lower():
-            return {"ok": False, "probe_status": "ssh_auth", "error": err, "duration_ms": duration_ms}
-        return {"ok": False, "probe_status": "offline", "error": err, "duration_ms": duration_ms}
+        err_raw = (result.get("stderr") or result.get("stdout") or "SSH watch probe failed")[:300]
+        if "timed out" in err_raw.lower() or duration_ms >= timeout * 1000 - 50:
+            return {
+                "ok": False,
+                "probe_status": "ssh_timeout",
+                "error": watch_probe_error_zh(err_raw, status="ssh_timeout"),
+                "duration_ms": duration_ms,
+            }
+        if "auth" in err_raw.lower() or "permission denied" in err_raw.lower():
+            return {
+                "ok": False,
+                "probe_status": "ssh_auth",
+                "error": watch_probe_error_zh(err_raw, status="ssh_auth"),
+                "duration_ms": duration_ms,
+            }
+        return {
+            "ok": False,
+            "probe_status": "offline",
+            "error": watch_probe_error_zh(err_raw, status="offline"),
+            "duration_ms": duration_ms,
+        }
 
     parsed = _parse_json_stdout(result.get("stdout", ""))
     if not parsed or parsed.get("status") != "ok":
-        err = (parsed or {}).get("error") or "parse_error"
-        return {"ok": False, "probe_status": "parse_error", "error": str(err)[:255], "duration_ms": duration_ms}
+        raw = (result.get("stdout") or "").strip().replace("\n", " ")[:200]
+        err_key = (parsed or {}).get("error") or "parse_error"
+        err_combined = f"parse_error: {raw}" if err_key == "parse_error" and raw else str(err_key)
+        return {
+            "ok": False,
+            "probe_status": "parse_error",
+            "error": watch_probe_error_zh(err_combined, status="parse_error"),
+            "duration_ms": duration_ms,
+        }
     parsed["duration_ms"] = duration_ms
     return {"ok": True, "payload": parsed, "duration_ms": duration_ms}
 
diff --git a/server/utils/watch_metrics.py b/server/utils/watch_metrics.py
index f7a08b1f..441259ff 100644
--- a/server/utils/watch_metrics.py
+++ b/server/utils/watch_metrics.py
@@ -10,6 +10,15 @@ from server.utils.fleet_metrics import _metric_from_system_info, _safe_pct
 
 WATCH_MAX_SLOTS = 4
 WATCH_PIN_TTL_HOURS = 8
+WATCH_PIN_TTL_EXTENDED_HOURS = 24
+WATCH_PIN_TTL_ALLOWED = frozenset({WATCH_PIN_TTL_HOURS, WATCH_PIN_TTL_EXTENDED_HOURS})
+
+
+def normalize_watch_ttl_hours(hours: int) -> int:
+    """Only 8h (default) or 24h (explicit opt-in) are allowed."""
+    if hours == WATCH_PIN_TTL_EXTENDED_HOURS:
+        return WATCH_PIN_TTL_EXTENDED_HOURS
+    return WATCH_PIN_TTL_HOURS
 WATCH_PROBE_INTERVAL_SEC = 5
 WATCH_REDIS_FRESH_SEC = 90
 WATCH_PROBE_TIMEOUT_SEC = 8
@@ -84,6 +93,13 @@ def redis_sample_has_io(sample: WatchProbeSample | None) -> bool:
     )
 
 
+def redis_sample_has_basic_metrics(sample: WatchProbeSample | None) -> bool:
+    """True when Agent heartbeat has CPU or memory — IO optional."""
+    if sample is None or sample.probe_status != PROBE_OK:
+        return False
+    return sample.cpu_pct is not None or sample.mem_pct is not None
+
+
 def sanitize_processes(raw: Any) -> list[dict[str, Any]] | None:
     if not isinstance(raw, list):
         return None
diff --git a/server/utils/watch_probe_errors.py b/server/utils/watch_probe_errors.py
new file mode 100644
index 00000000..41c49825
--- /dev/null
+++ b/server/utils/watch_probe_errors.py
@@ -0,0 +1,61 @@
+"""Chinese user-facing messages for watch probe failures."""
+
+from __future__ import annotations
+
+_EXACT: dict[str, str] = {
+    "parse_error": "探针返回数据无法解析",
+    "psutil missing": "子机未安装 psutil（请执行 pip install psutil）",
+    "ssh_probe_failed": "SSH 探针脚本执行失败",
+    "SSH watch probe failed": "SSH 监测探针失败",
+    "SSH probe failed": "SSH 探针失败",
+    "timeout": "连接超时",
+    "探针失败": "探针失败",
+    "无 Agent 且 SSH 探针失败": "无 Agent 且 SSH 探针失败",
+    "服务器不存在": "服务器不存在",
+}
+
+
+def watch_probe_error_zh(error: str | None, *, status: str | None = None) -> str | None:
+    """Map probe error text to Chinese for UI / audit display."""
+    if not error:
+        if status == "parse_error":
+            return "探针返回数据无法解析"
+        if status == "ssh_timeout":
+            return "SSH 连接超时"
+        if status == "ssh_auth":
+            return "SSH 认证失败"
+        if status == "no_cred":
+            return "需要 Agent 或 SSH 凭据"
+        if status == "redis_stale":
+            return "Agent 心跳已过期"
+        if status == "offline":
+            return "目标服务器离线或不可达"
+        return None
+
+    text = error.strip()
+    if text in _EXACT:
+        return _EXACT[text]
+
+    lower = text.lower()
+    if lower.startswith("parse_error"):
+        detail = text.split(":", 1)[1].strip() if ":" in text else ""
+        if detail in _EXACT:
+            return f"探针返回数据无法解析：{_EXACT[detail]}"
+        if detail:
+            return f"探针返回数据无法解析：{detail}"
+        return "探针返回数据无法解析"
+
+    if "timed out" in lower or lower.endswith("timeout"):
+        return f"SSH 连接超时：{text}"
+    if "permission denied" in lower or "authentication failed" in lower:
+        return f"SSH 认证失败：{text}"
+    if "psutil missing" in lower:
+        return "子机未安装 psutil（请执行 pip install psutil）"
+    if "ssh_probe_failed" in lower or "ssh watch probe failed" in lower:
+        return "SSH 探针脚本执行失败"
+
+    # Already Chinese or mixed — return as-is if contains CJK
+    if any("\u4e00" <= ch <= "\u9fff" for ch in text):
+        return text
+
+    return f"探针异常：{text}"
diff --git a/server/utils/watch_state.py b/server/utils/watch_state.py
new file mode 100644
index 00000000..f3407391
--- /dev/null
+++ b/server/utils/watch_state.py
@@ -0,0 +1,19 @@
+"""Watch slot Redis snapshots — cleared when no active 5s monitoring remains."""
+
+from __future__ import annotations
+
+from server.infrastructure.redis.client import get_redis
+
+REDIS_WATCH_LIVE_PREFIX = "watch:live:"
+REDIS_WATCH_PROC_PREFIX = "watch:proc:"
+REDIS_WATCH_LAST_PREFIX = "watch:last:"
+
+
+async def clear_watch_redis_snapshot(server_id: int) -> None:
+    """Remove 5s watch sliding window; Agent continues normal 60s heartbeat."""
+    redis = get_redis()
+    await redis.delete(
+        f"{REDIS_WATCH_LIVE_PREFIX}{server_id}",
+        f"{REDIS_WATCH_PROC_PREFIX}{server_id}",
+        f"{REDIS_WATCH_LAST_PREFIX}{server_id}",
+    )
diff --git a/tests/test_watch_metrics.py b/tests/test_watch_metrics.py
index 7c52da79..317f7ca5 100644
--- a/tests/test_watch_metrics.py
+++ b/tests/test_watch_metrics.py
@@ -10,6 +10,7 @@ from server.utils.watch_metrics import (
     merge_redis_and_ssh,
     parse_ssh_watch_payload,
     redis_sample_has_io,
+    redis_sample_has_basic_metrics,
     sanitize_processes,
     PROBE_OK,
 )
@@ -44,6 +45,22 @@ def test_compute_rates_no_prev():
     assert up is None and down is None and dr is None and dw is None
 
 
+def test_redis_sample_has_basic_metrics():
+    basic = WatchProbeSample(probe_status=PROBE_OK, source="redis", cpu_pct=10)
+    assert redis_sample_has_basic_metrics(basic) is True
+    assert redis_sample_has_io(basic) is False
+    assert redis_sample_has_basic_metrics(None) is False
+
+
+def test_parse_json_stdout_with_prefix_noise():
+    from server.infrastructure.ssh.remote_probe import _parse_json_stdout
+
+    stdout = "Warning: something\nOK {\"status\": \"ok\", \"cpu_usage\": 1.0}\n"
+    parsed = _parse_json_stdout(stdout)
+    assert parsed is not None
+    assert parsed.get("status") == "ok"
+
+
 def test_redis_sample_has_io():
     complete = WatchProbeSample(
         probe_status=PROBE_OK,
diff --git a/tests/test_watch_pins.py b/tests/test_watch_pins.py
index 4e4f1435..5e7f8e70 100644
--- a/tests/test_watch_pins.py
+++ b/tests/test_watch_pins.py
@@ -17,7 +17,9 @@ def mock_watch_redis(monkeypatch):
     mock_redis.lindex = AsyncMock(return_value=None)
     mock_redis.lrange = AsyncMock(return_value=[])
     mock_redis.get = AsyncMock(return_value=None)
+    mock_redis.delete = AsyncMock(return_value=1)
     monkeypatch.setattr("server.application.services.watch_service.get_redis", lambda: mock_redis)
+    monkeypatch.setattr("server.utils.watch_state.get_redis", lambda: mock_redis)
     return mock_redis
 
 
@@ -85,3 +87,154 @@ async def test_watch_probe_record_on_failure(db_session):
     await db_session.commit()
     assert row.probe_status == "ssh_timeout"
     assert row.cpu_pct is None
+
+
+@pytest.mark.asyncio
+async def test_watch_pin_monitoring_toggle(db_session, test_admin, mock_watch_redis):
+    from server.application.services.watch_service import WatchService
+
+    server = Server(name="watch-toggle", domain="wt.example.com", port=22, agent_version="1.0")
+    db_session.add(server)
+    await db_session.commit()
+
+    svc = WatchService(db_session)
+    admin = test_admin["admin"]
+
+    await svc.pin_server(admin=admin, server_id=server.id)
+    listing = await svc.list_slots(admin.id)
+    assert listing["slots"][0]["monitoring_enabled"] is True
+
+    paused = await svc.set_slot_monitoring(
+        admin=admin,
+        slot_index=0,
+        monitoring_enabled=False,
+    )
+    assert paused["slots"][0]["monitoring_enabled"] is False
+    assert paused["slots"][0]["remaining_sec"] is None
+
+    resumed = await svc.set_slot_monitoring(
+        admin=admin,
+        slot_index=0,
+        monitoring_enabled=True,
+    )
+    assert resumed["slots"][0]["monitoring_enabled"] is True
+    assert resumed["slots"][0]["remaining_sec"] is not None
+    assert resumed["slots"][0]["remaining_sec"] > 0
+
+
+@pytest.mark.asyncio
+async def test_watch_pin_ttl_hours(db_session, test_admin, mock_watch_redis):
+    from server.application.services.watch_service import WatchService
+    from server.utils.watch_metrics import WATCH_PIN_TTL_EXTENDED_HOURS, WATCH_PIN_TTL_HOURS
+
+    server = Server(name="watch-ttl", domain="wt2.example.com", port=22, agent_version="1.0")
+    db_session.add(server)
+    await db_session.commit()
+
+    svc = WatchService(db_session)
+    admin = test_admin["admin"]
+
+    await svc.pin_server(admin=admin, server_id=server.id, ttl_hours=WATCH_PIN_TTL_HOURS)
+    listing = await svc.list_slots(admin.id)
+    assert listing["slots"][0]["ttl_hours"] == WATCH_PIN_TTL_HOURS
+
+    extended = await svc.set_slot_ttl(
+        admin=admin,
+        slot_index=0,
+        ttl_hours=WATCH_PIN_TTL_EXTENDED_HOURS,
+    )
+    assert extended["slots"][0]["ttl_hours"] == WATCH_PIN_TTL_EXTENDED_HOURS
+    assert extended["slots"][0]["remaining_sec"] >= WATCH_PIN_TTL_EXTENDED_HOURS * 3600 - 5
+
+
+@pytest.mark.asyncio
+async def test_watch_pin_ttl_expiry_list_syncs_before_display(db_session, test_admin, mock_watch_redis):
+    """TTL 到期后、探针循环未跑 expire 前，list_slots 应同步为暂停态而非空槽。"""
+    from datetime import timedelta
+
+    from server.infrastructure.database.watch_repo import WatchRepositoryImpl, _utc_naive_now
+    from server.application.services.watch_service import WatchService
+
+    server = Server(name="watch-expire-list", domain="wel.example.com", port=22, agent_version="1.0")
+    db_session.add(server)
+    await db_session.commit()
+
+    svc = WatchService(db_session)
+    admin = test_admin["admin"]
+    await svc.pin_server(admin=admin, server_id=server.id)
+
+    repo = WatchRepositoryImpl(db_session)
+    pin = await repo.get_pin_by_slot(admin.id, 0)
+    assert pin is not None
+    pin.expires_at = _utc_naive_now() - timedelta(seconds=1)
+    await db_session.commit()
+
+    # 不手动调用 expire_due_pins — 模拟探针循环尚未处理的窗口
+    listing = await svc.list_slots(admin.id)
+    assert listing["slots"][0]["empty"] is False
+    assert listing["slots"][0]["monitoring_enabled"] is False
+    assert listing["slots"][0]["remaining_sec"] is None
+
+
+@pytest.mark.asyncio
+async def test_watch_pin_ttl_expiry_pin_server_no_duplicate(db_session, test_admin, mock_watch_redis):
+    """到期 ghost pin 不应导致同槽 create_pin 唯一约束冲突。"""
+    from datetime import timedelta
+
+    from server.infrastructure.database.watch_repo import WatchRepositoryImpl, _utc_naive_now
+    from server.application.services.watch_service import WatchService
+
+    server_a = Server(name="watch-exp-a", domain="wea.example.com", port=22, agent_version="1.0")
+    server_b = Server(name="watch-exp-b", domain="web.example.com", port=22, agent_version="1.0")
+    db_session.add_all([server_a, server_b])
+    await db_session.commit()
+
+    svc = WatchService(db_session)
+    admin = test_admin["admin"]
+    await svc.pin_server(admin=admin, server_id=server_a.id, slot_index=0)
+
+    repo = WatchRepositoryImpl(db_session)
+    pin = await repo.get_pin_by_slot(admin.id, 0)
+    assert pin is not None
+    pin.expires_at = _utc_naive_now() - timedelta(seconds=1)
+    await db_session.commit()
+
+    # 替换槽位服务器 — 应先 finalize 再 replace，不能 IntegrityError
+    result = await svc.pin_server(admin=admin, server_id=server_b.id, slot_index=0)
+    assert result["slots"][0]["empty"] is False
+    assert result["slots"][0]["server_id"] == server_b.id
+    assert result["slots"][0]["monitoring_enabled"] is True
+
+
+@pytest.mark.asyncio
+async def test_watch_pin_ttl_expiry_pauses_not_deletes(db_session, test_admin, mock_watch_redis):
+    from datetime import timedelta
+
+    from server.infrastructure.database.watch_repo import WatchRepositoryImpl, _utc_naive_now
+    from server.application.services.watch_service import WatchService
+
+    server = Server(name="watch-expire", domain="we.example.com", port=22, agent_version="1.0")
+    db_session.add(server)
+    await db_session.commit()
+
+    svc = WatchService(db_session)
+    admin = test_admin["admin"]
+    await svc.pin_server(admin=admin, server_id=server.id)
+
+    repo = WatchRepositoryImpl(db_session)
+    pin = await repo.get_pin_by_slot(admin.id, 0)
+    assert pin is not None
+    pin.expires_at = _utc_naive_now() - timedelta(seconds=1)
+    await db_session.commit()
+
+    expired = await repo.expire_due_pins()
+    assert server.id in expired
+    await db_session.commit()
+
+    still = await repo.get_pin_by_slot(admin.id, 0)
+    assert still is not None
+    assert still.monitoring_enabled is False
+
+    listing = await svc.list_slots(admin.id)
+    assert listing["slots"][0]["empty"] is False
+    assert listing["slots"][0]["monitoring_enabled"] is False
diff --git a/tests/test_watch_probe_errors.py b/tests/test_watch_probe_errors.py
new file mode 100644
index 00000000..46580dcd
--- /dev/null
+++ b/tests/test_watch_probe_errors.py
@@ -0,0 +1,23 @@
+"""Tests for watch probe error localization."""
+
+from server.utils.watch_probe_errors import watch_probe_error_zh
+
+
+def test_parse_error_zh():
+    assert watch_probe_error_zh("parse_error") == "探针返回数据无法解析"
+    assert watch_probe_error_zh("psutil missing") == "子机未安装 psutil（请执行 pip install psutil）"
+
+
+def test_parse_error_with_detail():
+    out = watch_probe_error_zh("parse_error: psutil missing")
+    assert "探针返回数据无法解析" in out
+    assert "psutil" in out
+
+
+def test_timeout_zh():
+    out = watch_probe_error_zh("Connection timed out during banner exchange")
+    assert out.startswith("SSH 连接超时")
+
+
+def test_status_only_fallback():
+    assert watch_probe_error_zh(None, status="ssh_timeout") == "SSH 连接超时"