diff --git a/src/BowongModalFunctions/utils/HTTPUtils.py b/src/BowongModalFunctions/utils/HTTPUtils.py
index b76faa8..3c150c4 100644
--- a/src/BowongModalFunctions/utils/HTTPUtils.py
+++ b/src/BowongModalFunctions/utils/HTTPUtils.py
@@ -165,7 +165,7 @@ class GoogleAuthUtils:
                              timeout: int = 30) -> tuple[dict[Any, Any], int] | tuple[GenerateContentResponse, int]:
             parameter_model = GoogleAuthUtils.VertexAIRequestModel(contents=contents, generationConfig=config)
             json_body = parameter_model.model_dump_json(indent=2, exclude_none=True, by_alias=True,
-                                                        exclude={"generation_config": {"safety_settings", "system_instruction"}})
+                                                        exclude={"generation_config": ["safety_settings", "system_instruction"]})
             logger.info(json_body)
             url = f"{self.gateway_url}/{model_id}:generateContent"
             logger.info(f"Authorization : Bearer {self.access_token}")
diff --git a/src/cluster/ffmpeg_apps/schedule_cleanup.py b/src/cluster/ffmpeg_apps/schedule_cleanup.py
new file mode 100644
index 0000000..0075d97
--- /dev/null
+++ b/src/cluster/ffmpeg_apps/schedule_cleanup.py
@@ -0,0 +1,39 @@
+import modal
+
+from ..ffmpeg_app import ffmpeg_worker_image, app, config
+
+with ffmpeg_worker_image.imports():
+    import os, time
+    from datetime import datetime
+    from loguru import logger
+    import shutil
+    from typing import Tuple, List
+
+    hls_recording_volume = modal.Volume.from_name("stream_records", create_if_missing=True)
+    hls_recording_mount_point = "/mnt/stream_records"
+
+
+    # runs daily at 3 am (Hong Kong time)
+    @app.function(
+        volumes={hls_recording_mount_point: hls_recording_volume},
+        schedule=modal.Cron("0 3 * * *", timezone="Asia/Hong_Kong")
+    )
+    def storage_cleanup():
+        output_dir = f"{config.modal_environment}/records/hls/"
+        volume_output_dir = f"{hls_recording_mount_point}/{output_dir}"
+        now = time.time()
+        cutoff = now - 24 * 60 * 60  # 24小时之前的时间戳
+        new_folders: List[Tuple[str, datetime]] = []
+        old_folders: List[Tuple[str, datetime]] = []
+        for entry in os.scandir(volume_output_dir):
+            if entry.is_dir():
+                mtime = entry.stat().st_mtime
+                if mtime < cutoff:
+                    old_folders.append((entry.path, datetime.fromtimestamp(mtime)))
+                else:
+                    new_folders.append((entry.path, datetime.fromtimestamp(mtime)))
+
+        for folder, timestamp in old_folders:
+            logger.info(f"Removing {folder}, last modified {timestamp.isoformat()}")
+            shutil.rmtree(folder)
+        logger.info(f"{len(old_folders)} tasks cleaned up, {len(new_folders)} tasks remaining")