added prepared epc warning

etl/epc/Record.py

@@ -1,4 +1,4 @@
-from warnings import deprecated
+import warnings
 from typing import Optional, get_origin, get_args, TypedDict, cast, TypeAlias
 from backend.addresses.Address import Address
 from dataclasses import fields
@@ -1144,6 +1144,11 @@ class EPCRecord:
 
     @property
     def prepared_epc(self):
+        warnings.warn(
+            "Accessing prepared_epc directly is deprecated, use get method instead",
+            DeprecationWarning,
+            stacklevel=2,
+        )
         return self._prepared_epc