Updates

ETB-API/venv/lib/python3.12/site-packages/timezone_field/backends/base.py

@@ -0,0 +1,19 @@
+from abc import ABC, abstractmethod
+
+
+class TimeZoneNotFoundError(Exception):
+    pass
+
+
+class TimeZoneBackend(ABC):
+    utc_tzobj = None
+    all_tzstrs = None
+    base_tzstrs = None
+
+    @abstractmethod
+    def is_tzobj(self, value):
+        pass
+
+    @abstractmethod
+    def to_tzobj(self, tzstr):
+        pass