fix(8502): 重生图片自动作废旧视频；记录来源图片签名并提示stale；组图/重生视频路径唯一化

modules/video_gen.py

@@ -6,6 +6,7 @@ import logging
 import time
 import requests
 import os
+from os import stat
 from typing import Dict, Any, List, Optional
 from pathlib import Path
 
@@ -56,6 +57,21 @@ class VideoGenerator:
         task_id = self._submit_task(image_url, prompt)
         
         if task_id:
+            try:
+                st = stat(image_path)
+                source_sig = {
+                    "source_image_local_path": image_path,
+                    "source_image_size": int(getattr(st, "st_size", 0) or 0),
+                    "source_image_mtime": float(getattr(st, "st_mtime", 0.0) or 0.0),
+                    "source_image_r2_url": image_url,
+                    "submitted_at": time.time(),
+                }
+            except Exception:
+                source_sig = {
+                    "source_image_local_path": image_path,
+                    "source_image_r2_url": image_url,
+                    "submitted_at": time.time(),
+                }
             # 立即保存 task_id 到数据库，状态为 processing
             db.save_asset(
                 project_id=project_id,
@@ -63,7 +79,8 @@ class VideoGenerator:
                 asset_type="video",
                 status="processing",
                 task_id=task_id,
-                local_path=None
+                local_path=None,
+                metadata=source_sig,
             )
             
         return task_id