add sanic development server implementation

nominatim/result_formatter/base.py

@@ -28,6 +28,12 @@ class ResultFormatter(Generic[T]):
         return list(self.functions.keys())
 
 
+    def supports_format(self, fmt: str) -> bool:
+        """ Check if the given format is supported by this formatter.
+        """
+        return fmt in self.functions
+
+
     def format(self, result: T, fmt: str) -> str:
         """ Convert the given result into a string using the given format.
 

nominatim/result_formatter/v1.py

@@ -28,7 +28,7 @@ def _format_status_json(result: StatusResult) -> str:
     out['status'] = result.status
     out['message'] = result.message
     if result.data_updated is not None:
-        out['data_updated'] = result.data_updated
+        out['data_updated'] = result.data_updated.isoformat()
     out['software_version'] = result.software_version
     if result.database_version is not None:
         out['database_version'] = result.database_version