FieldMeasurement.generic constructor
Fallback para migración o genérico
Implementation
const factory FieldMeasurement.generic({
required String id,
required String nodeId,
required DateTime measuredAt,
required String measuredBy,
String? instrument,
String? notes,
List<String>? photoUrls,
// Legacy mapping fields
double? measuredVoltageLN,
double? measuredRcdTripTime,
double? measuredEarthResistance,
}) = GenericMeasurement;