Dart APIunself_local_databaseFieldCompanionupdated updated property Null safety Value<DateTime> updated final Implementation final Value<DateTime> updated; unself_local_database unself_local_database FieldCompanion updated property FieldCompanion class Constructors FieldCompanion insert Properties collectionId created extra hashCode id name required runtimeType system type unique updated Methods copyWith noSuchMethod toColumns toString Operators operator == Static methods custom