add fallback model

my/location/common.py

@@ -1,5 +1,5 @@
 from datetime import date, datetime
-from typing import Union, Tuple, NamedTuple, Optional
+from typing import Union, Tuple, Optional
 from dataclasses import dataclass
 
 from my.core import __NOT_HPI_MODULE__
@@ -11,8 +11,10 @@ LatLon = Tuple[float, float]
 
 # TODO: add timezone to this? can use timezonefinder in tz provider instead though
 
+# converted from namedtuple to a dataclass so datasource field can be added optionally
+# if we want, can eventually be converted back to a namedtuple when all datasources are compliant
 @dataclass
-class Location(NamedTuple):
+class Location:
     lat: float
     lon: float
     dt: datetime