database , chat vod and shorts update error messages

twitch_chat_vod.py

@@ -2,7 +2,7 @@
 import  os
 import linux
 
-def combine_twitch_vod_and_chat(vod_path: str, layout: str = "side-by-side") -> bool:
+def combine_twitch_vod_and_chat(vod_path: str, layout: str = "side-by-side", force: bool = False) -> bool:
     """
     Renders Twitch chat JSON to video and combines it with the source VOD.
     Provides real-time terminal feedback for all processing steps.
@@ -14,6 +14,10 @@ def combine_twitch_vod_and_chat(vod_path: str, layout: str = "side-by-side") ->
     mask_path = video_path.replace(".mp4", "_temp_chat_mask.mp4")
 
     # Step 1: Pre-flight checks
+    if os.path.exists(video_chat) and force is False:
+        print(f"❌ Error: Chat video allready exists: {video_chat}")
+        return False
+    
     if not os.path.exists(video_path):
         print(f"❌ Error: Source video not found: {video_path}")
         return False