feat: add timestamp to default filename_prefix for cache-busting

Change default filename_prefix on all previewable save nodes (image, video,
audio, 3D, SVG) from 'ComfyUI' to 'ComfyUI_%year%%month%%day%-%hour%%minute%%second%'.

This leverages the existing compute_vars template system in
get_save_image_path — zero new backend code needed. Each output gets a
unique filename per second, preventing browser cache from showing stale
previews when files are overwritten.

Users can customize or remove the template from the node widget.
Existing workflows retain their saved prefix value (only new nodes
get the new default). Custom nodes are unaffected — they define their
own defaults independently.

comfy_extras/nodes_audio.py

@@ -162,7 +162,7 @@ class SaveAudio(IO.ComfyNode):
             essentials_category="Audio",
             inputs=[
                 IO.Audio.Input("audio"),
-                IO.String.Input("filename_prefix", default="audio/ComfyUI"),
+                IO.String.Input("filename_prefix", default="audio/ComfyUI_%year%%month%%day%-%hour%%minute%%second%"),
             ],
             hidden=[IO.Hidden.prompt, IO.Hidden.extra_pnginfo],
             is_output_node=True,
@@ -187,7 +187,7 @@ class SaveAudioMP3(IO.ComfyNode):
             category="audio",
             inputs=[
                 IO.Audio.Input("audio"),
-                IO.String.Input("filename_prefix", default="audio/ComfyUI"),
+                IO.String.Input("filename_prefix", default="audio/ComfyUI_%year%%month%%day%-%hour%%minute%%second%"),
                 IO.Combo.Input("quality", options=["V0", "128k", "320k"], default="V0"),
             ],
             hidden=[IO.Hidden.prompt, IO.Hidden.extra_pnginfo],
@@ -215,7 +215,7 @@ class SaveAudioOpus(IO.ComfyNode):
             category="audio",
             inputs=[
                 IO.Audio.Input("audio"),
-                IO.String.Input("filename_prefix", default="audio/ComfyUI"),
+                IO.String.Input("filename_prefix", default="audio/ComfyUI_%year%%month%%day%-%hour%%minute%%second%"),
                 IO.Combo.Input("quality", options=["64k", "96k", "128k", "192k", "320k"], default="128k"),
             ],
             hidden=[IO.Hidden.prompt, IO.Hidden.extra_pnginfo],

comfy_extras/nodes_hunyuan3d.py

@@ -637,7 +637,7 @@ class SaveGLB(IO.ComfyNode):
                     ],
                     tooltip="Mesh or 3D file to save",
                 ),
-                IO.String.Input("filename_prefix", default="mesh/ComfyUI"),
+                IO.String.Input("filename_prefix", default="mesh/ComfyUI_%year%%month%%day%-%hour%%minute%%second%"),
             ],
             hidden=[IO.Hidden.prompt, IO.Hidden.extra_pnginfo]
         )

comfy_extras/nodes_images.py

@@ -190,7 +190,7 @@ class SaveAnimatedWEBP(IO.ComfyNode):
             category="image/animation",
             inputs=[
                 IO.Image.Input("images"),
-                IO.String.Input("filename_prefix", default="ComfyUI"),
+                IO.String.Input("filename_prefix", default="ComfyUI_%year%%month%%day%-%hour%%minute%%second%"),
                 IO.Float.Input("fps", default=6.0, min=0.01, max=1000.0, step=0.01),
                 IO.Boolean.Input("lossless", default=True),
                 IO.Int.Input("quality", default=80, min=0, max=100),
@@ -227,7 +227,7 @@ class SaveAnimatedPNG(IO.ComfyNode):
             category="image/animation",
             inputs=[
                 IO.Image.Input("images"),
-                IO.String.Input("filename_prefix", default="ComfyUI"),
+                IO.String.Input("filename_prefix", default="ComfyUI_%year%%month%%day%-%hour%%minute%%second%"),
                 IO.Float.Input("fps", default=6.0, min=0.01, max=1000.0, step=0.01),
                 IO.Int.Input("compress_level", default=4, min=0, max=9, advanced=True),
             ],
@@ -489,7 +489,7 @@ class SaveSVGNode(IO.ComfyNode):
                 IO.SVG.Input("svg"),
                 IO.String.Input(
                     "filename_prefix",
-                    default="svg/ComfyUI",
+                    default="svg/ComfyUI_%year%%month%%day%-%hour%%minute%%second%",
                     tooltip="The prefix for the file to save. This may include formatting information such as %date:yyyy-MM-dd% or %Empty Latent Image.width% to include values from nodes.",
                 ),
             ],

comfy_extras/nodes_video.py

@@ -21,7 +21,7 @@ class SaveWEBM(io.ComfyNode):
             is_experimental=True,
             inputs=[
                 io.Image.Input("images"),
-                io.String.Input("filename_prefix", default="ComfyUI"),
+                io.String.Input("filename_prefix", default="ComfyUI_%year%%month%%day%-%hour%%minute%%second%"),
                 io.Combo.Input("codec", options=["vp9", "av1"]),
                 io.Float.Input("fps", default=24.0, min=0.01, max=1000.0, step=0.01),
                 io.Float.Input("crf", default=32.0, min=0, max=63.0, step=1, tooltip="Higher crf means lower quality with a smaller file size, lower crf means higher quality higher filesize."),
@@ -77,7 +77,7 @@ class SaveVideo(io.ComfyNode):
             description="Saves the input images to your ComfyUI output directory.",
             inputs=[
                 io.Video.Input("video", tooltip="The video to save."),
-                io.String.Input("filename_prefix", default="video/ComfyUI", tooltip="The prefix for the file to save. This may include formatting information such as %date:yyyy-MM-dd% or %Empty Latent Image.width% to include values from nodes."),
+                io.String.Input("filename_prefix", default="video/ComfyUI_%year%%month%%day%-%hour%%minute%%second%", tooltip="The prefix for the file to save. This may include formatting information such as %date:yyyy-MM-dd% or %Empty Latent Image.width% to include values from nodes."),
                 io.Combo.Input("format", options=Types.VideoContainer.as_input(), default="auto", tooltip="The format to save the video as."),
                 io.Combo.Input("codec", options=Types.VideoCodec.as_input(), default="auto", tooltip="The codec to use for the video."),
             ],

nodes.py

@@ -1638,7 +1638,7 @@ class SaveImage:
         return {
             "required": {
                 "images": ("IMAGE", {"tooltip": "The images to save."}),
-                "filename_prefix": ("STRING", {"default": "ComfyUI", "tooltip": "The prefix for the file to save. This may include formatting information such as %date:yyyy-MM-dd% or %Empty Latent Image.width% to include values from nodes."})
+                "filename_prefix": ("STRING", {"default": "ComfyUI_%year%%month%%day%-%hour%%minute%%second%", "tooltip": "The prefix for the file to save. This may include formatting information such as %date:yyyy-MM-dd% or %Empty Latent Image.width% to include values from nodes."})
             },
             "hidden": {
                 "prompt": "PROMPT", "extra_pnginfo": "EXTRA_PNGINFO"