diff --git a/README.md b/README.md
index 74ea994..9b537c5 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # cleanup-smartcam-data 部署说明
 
-![cleanup-smartcam-data 自动清理策略](assets/cleanup-smartcam-data-flow.svg)
+![cleanup-smartcam-data 自动清理策略](assets/cleanup-smartcam-data-flow.png)
 
 ## 文件结构
 
@@ -8,8 +8,8 @@
 cleanup-smartcam-data/
 ├── README.md
 ├── assets/
-│   ├── cleanup-smartcam-data-flow.svg
-│   └── cleanup-smartcam-data-flow.png（旧版兼容文件）
+│   ├── cleanup-smartcam-data-flow.svg（旧版源文件）
+│   └── cleanup-smartcam-data-flow.png（当前流程图）
 ├── bin/
 │   └── cleanup-smartcam-data
 ├── systemd/
@@ -72,7 +72,7 @@ sudo ./scripts/install.sh
 
 - 开机2分钟后首次检查；
 - 之后每60分钟检查一次；
-- `/userdata` 空闲低于10GiB时开始安全清理；
+- 每次定时检查都会安全清理已确认上传成功的数据，不以空闲空间阈值作为清理条件；
 - 只清理 `processed_files.log` 中确认成功、且超过60分钟的数据；
 - 同时删除同一任务的：
 
@@ -83,10 +83,9 @@ sudo ./scripts/install.sh
 ```
 
 - 超过60分钟的0字节 raw，如果未被进程占用，也会按上述三件套删除；
-- 空闲低于5GiB时暂停采集，Producer继续上传；
+- 空闲低于3GiB时暂停整个 `smart_camera` 进程（持续检测、录像和识别一起暂停），Producer继续上传，并输出 CRITICAL 告警；
 - 暂停期间每2分钟检查一次；
-- 空闲恢复到10GiB后自动恢复采集，并停止2分钟检查；
-- 空闲低于3GiB时输出 CRITICAL 告警；
+- 清理使空闲恢复到5GiB后自动恢复 `smart_camera`；程序重新持续检测，达到鸟类确认门控后再录像和识别，并停止2分钟快速检查；
 - 无法读取成功记录时不删除数据。
 
 ## 验证
diff --git a/assets/cleanup-smartcam-data-flow.png b/assets/cleanup-smartcam-data-flow.png
index f5e6047..17649e3 100644
Binary files a/assets/cleanup-smartcam-data-flow.png and b/assets/cleanup-smartcam-data-flow.png differ
diff --git a/bin/cleanup-smartcam-data b/bin/cleanup-smartcam-data
index 426fe35..a5026bb 100755
--- a/bin/cleanup-smartcam-data
+++ b/bin/cleanup-smartcam-data
@@ -9,10 +9,10 @@ STATE_DIR="/var/lib/cleanup-smartcam-data"
 PAUSED_STATE="${STATE_DIR}/capture-paused"
 LOCK_FILE="/run/cleanup-smartcam-data.lock"
 
-# Start deleting confirmed bundles below 10 GiB, pause capture below 5 GiB,
-# raise a critical alert below 3 GiB, and resume after recovery to 10 GiB.
-CLEAN_TARGET_BYTES="${CLEAN_TARGET_BYTES:-10737418240}"
-PAUSE_BELOW_BYTES="${PAUSE_BELOW_BYTES:-5368709120}"
+# Delete confirmed bundles on every scheduled run. Pause capture and raise a
+# critical alert below 3 GiB, and resume after recovery to 5 GiB.
+RESUME_TARGET_BYTES="${RESUME_TARGET_BYTES:-5368709120}"
+PAUSE_BELOW_BYTES="${PAUSE_BELOW_BYTES:-3221225472}"
 CRITICAL_BELOW_BYTES="${CRITICAL_BELOW_BYTES:-3221225472}"
 MIN_FILE_AGE_MINUTES="${MIN_FILE_AGE_MINUTES:-60}"
 SAFE_WINDOW_SECONDS="${SAFE_WINDOW_SECONDS:-10}"
@@ -110,7 +110,7 @@ pause_capture() {
   kill -STOP "$pid"
   printf 'pid=%s\npaused_at=%s\n' "$pid" "$(date --iso-8601=seconds)" > "$PAUSED_STATE"
   start_fast_resume_checks
-  alert CRITICAL "capture paused at free=$(human_bytes "$free_bytes"); SFTP/Kafka uploader remains running; automatic resume target=$(human_bytes "$CLEAN_TARGET_BYTES")"
+  alert CRITICAL "capture paused at free=$(human_bytes "$free_bytes"); SFTP/Kafka uploader remains running; automatic resume target=$(human_bytes "$RESUME_TARGET_BYTES")"
 }
 
 resume_capture_if_ready() {
@@ -130,13 +130,13 @@ resume_capture_if_ready() {
     stop_fast_resume_checks
     return 0
   fi
-  if [[ "$free_bytes" -ge "$CLEAN_TARGET_BYTES" ]]; then
+  if [[ "$free_bytes" -ge "$RESUME_TARGET_BYTES" ]]; then
     kill -CONT "$pid"
     rm -f "$PAUSED_STATE"
     stop_fast_resume_checks
     alert RECOVERED "free space reached $(human_bytes "$free_bytes"); capture resumed automatically"
   else
-    log WARNING "capture remains paused: free=$(human_bytes "$free_bytes"), resume target=$(human_bytes "$CLEAN_TARGET_BYTES")"
+    log WARNING "capture remains paused: free=$(human_bytes "$free_bytes"), resume target=$(human_bytes "$RESUME_TARGET_BYTES")"
   fi
 }
 
@@ -170,7 +170,7 @@ build_safe_bundles() {
 }
 
 delete_safe_bundles() {
-  local bundles="$1" free_bytes deleted_count=0 deleted_bytes=0 record base path size
+  local bundles="$1" deleted_count=0 deleted_bytes=0 record base path size
   while IFS= read -r record; do
     base="${record#* }"
     for path in \
@@ -187,10 +187,6 @@ delete_safe_bundles() {
         log ERROR "failed to delete confirmed file: ${path}"
       fi
     done
-    free_bytes="$(available_bytes)"
-    if [[ "$free_bytes" -ge "$CLEAN_TARGET_BYTES" ]]; then
-      break
-    fi
   done < "$bundles"
   log INFO "safe cleanup result: deleted=${deleted_count} files bytes=${deleted_bytes} free=$(human_bytes "$(available_bytes)")"
 }
@@ -232,25 +228,30 @@ main() {
   local free_bytes processed bundles
   delete_stale_zero_bundles
   free_bytes="$(available_bytes)"
+
+  # Protect the disk before cleanup work: once free space is below 3 GiB,
+  # stop continuous detection/recording/inference first while upload stays up.
+  if [[ "$free_bytes" -lt "$CRITICAL_BELOW_BYTES" ]]; then
+    alert CRITICAL "free space below critical threshold: $(human_bytes "$free_bytes")"
+  fi
+  if [[ "$free_bytes" -lt "$PAUSE_BELOW_BYTES" ]]; then
+    pause_capture "$free_bytes"
+  fi
   resume_capture_if_ready "$free_bytes"
 
-  if [[ "$free_bytes" -lt "$CLEAN_TARGET_BYTES" ]]; then
-    processed="$(mktemp /tmp/userdata-processed.XXXXXX)"
-    bundles="$(mktemp /tmp/userdata-bundles.XXXXXX)"
-    trap 'rm -f "${processed:-}" "${bundles:-}"' EXIT
+  processed="$(mktemp /tmp/userdata-processed.XXXXXX)"
+  bundles="$(mktemp /tmp/userdata-bundles.XXXXXX)"
+  trap 'rm -f "${processed:-}" "${bundles:-}"' EXIT
 
-    if load_processed_files "$processed"; then
-      build_safe_bundles "$processed" "$bundles"
-      if [[ -s "$bundles" ]]; then
-        delete_safe_bundles "$bundles"
-      else
-        log WARNING "free space is low, but no confirmed old bundles are safe to delete"
-      fi
+  if load_processed_files "$processed"; then
+    build_safe_bundles "$processed" "$bundles"
+    if [[ -s "$bundles" ]]; then
+      delete_safe_bundles "$bundles"
     else
-      alert ERROR "cannot read confirmed-upload list; fail-safe mode prevents all deletion"
+      log INFO "no confirmed old bundles are ready for safe cleanup"
     fi
   else
-    log INFO "free space is sufficient: $(human_bytes "$free_bytes") available"
+    alert ERROR "cannot read confirmed-upload list; fail-safe mode prevents all deletion"
   fi
 
   free_bytes="$(available_bytes)"