setFieldEnhancement method
- {required AnkiMapping mapping,
- required Field field,
- required int slotNumber,
- required Enhancement enhancement}
Updates a given mapping's persisted enhancement for a given field
and slotNumber.
Implementation
void setFieldEnhancement({
  required AnkiMapping mapping,
  required Field field,
  required int slotNumber,
  required Enhancement enhancement,
}) async {
  mapping.enhancements![field.uniqueKey] ??= {};
  mapping.enhancements![field.uniqueKey]![slotNumber] = enhancement.uniqueKey;
  _database.writeTxnSync(() {
    _database.ankiMappings.putSync(mapping);
  });
}