diff --git a/csst_dfs_commons/models/__init__.py b/csst_dfs_commons/models/__init__.py
index b11efb712b4330a52a1c64ca654f3e7ab5f095a8..c3f7031314e830950e7f6dd2c5578731b3d62620 100644
--- a/csst_dfs_commons/models/__init__.py
+++ b/csst_dfs_commons/models/__init__.py
@@ -2,28 +2,38 @@
 class Result(dict):
     def __init__(self):
         super(Result, self).__init__()
-        self.code = 0
-        self.message = ""
-        self.data = None
+        self["code"] = 0
+        self["message"] = ""
+        self["data"] = None
     
     def success(self):
-        return self.code >= 0
+        return self["code"] >= 0
 
+    def data(self):
+        return self["data"]
+        
+    def message(self):
+        return self["message"]
+        
     @staticmethod
     def error(code = -1, message = ""):
         r = Result()
-        r.code = code
-        r.message = message
+        r["code"] = code
+        r["message"] = message
         return r
 
     @staticmethod
     def ok_data(data):
         r = Result()
-        r.data = data
+        r["data"] = data
         return r
         
     @staticmethod
     def ok_msg(message):
         r = Result()
-        r.message = message
-        return r
\ No newline at end of file
+        r["message"] = message
+        return r
+
+    def append(self, k: str, v):
+        self[k] = v
+        return self
\ No newline at end of file
diff --git a/csst_dfs_commons/models/errors.py b/csst_dfs_commons/models/errors.py
new file mode 100644
index 0000000000000000000000000000000000000000..9134aa294b78dda45b24782a37b02b5855d5ca26
--- /dev/null
+++ b/csst_dfs_commons/models/errors.py
@@ -0,0 +1,8 @@
+
+class CSSTGenericException(Exception):
+    def __init__(self, *args) -> None:
+        super(CSSTGenericException, self).__init__(*args)
+
+class CSSTFatalException(Exception):
+    def __init__(self, *args) -> None:
+        super(CSSTFatalException, self).__init__(*args)
\ No newline at end of file