Dart APIunself_local_databaseFieldCompanioncreated created property Null safety Value<DateTime> created final Implementation final Value<DateTime> created; unself_local_database unself_local_database FieldCompanion created 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