fix some errors

app/core/models/node_storage.py

@@ -114,14 +114,21 @@ class StoredContent(AlchemyBase, AudioContentMixin):
             ]:
                 extra_fields[k] = self.meta.get(k, None)
 
+        spec_field_updated = self.updated.isoformat() if isinstance(self.updated, datetime) else (
+            datetime.fromisoformat(self.updated).isoformat() if isinstance(self.updated, str) else None
+        )
+        spec_field_created = self.created.isoformat() if isinstance(self.created, datetime) else (
+            datetime.fromisoformat(self.created).isoformat() if isinstance(self.created, str) else None
+        )
+
         return {
             **extra_fields,
             "hash": self.hash,
             "cid": self.cid.serialize_v2(),
             "content_type": self.meta.get('content_type', 'application/x-binary'),
             "status": self.status,
-            "updated": self.updated.isoformat() if isinstance(self.updated, datetime) else (make_log("Content.json_format", f"Invalid Content.updated: {self.updated} ({type(self.updated)})", level="error") or None),
-            "created": self.created.isoformat() if isinstance(self.created, datetime) else (make_log("Content.json_format", f"Invalid Content.created: {self.created} ({type(self.created)})", level="error") or None),
+            "created": spec_field_created,
+            "updated": spec_field_updated,
         }
 
     @classmethod