fix(metadata-overwrite): rename 'checkpoint' input to 'model'

py/metadata_collector/constants.py

@@ -14,7 +14,7 @@ OVERWRITE = "overwrite"  # Manual metadata overwrite from MetadataOverwriteLM no
 # Field names that the MetadataOverwriteLM node and its extractor share
 METADATA_OVERWRITE_FIELDS = (
     "prompt", "negative_prompt", "seed", "steps", "cfg_scale",
-    "sampler", "scheduler", "checkpoint", "loras", "size",
+    "sampler", "scheduler", "model", "loras", "size",
     "clip_skip", "additional_data",
 )
 

py/metadata_collector/metadata_processor.py

@@ -681,6 +681,13 @@ class MetadataProcessor:
                 if value:  # truthy check — only overwrite when user provided a real value
                     params[key] = value
 
+        # Bridge: the overwrite node exposes the field as "model" (more accurate),
+        # but the internal pipeline key remains "checkpoint" for backward compatibility
+        # with A1111 metadata format and downstream consumers.
+        if params.get("model"):
+            params["checkpoint"] = params["model"]
+            del params["model"]
+
         return params
     
     @staticmethod