[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Storage](https://evolu.dev/docs/api-reference/common/local-first/Storage) › ValidDbChangeValues

```ts
const ValidDbChangeValues:  brand(
  "ValidDbChangeValues",
  DbChangeValues,
  (value) => {
    const invalidColumns = systemColumnsWithId.filter((key) => key in value);
    if (invalidColumns.length > 0)
      return err<ValidDbChangeValuesError>({
        type: "ValidDbChangeValues",
        value,
        invalidColumns,
      });

    return ok();
  },
  (error) =>
    DbChange values contain reserved system columns: ${error.invalidColumns.join(", ")}.,
) ;
```

Defined in: [packages/common/src/local-first/Storage.ts:300](https://github.com/evoluhq/evolu/blob/49ea8ca499566aba270f8cb601e7f49aa62320f8/packages/common/src/local-first/Storage.ts#L300)