I am aware to the fact that database testing (CRUD) can be viewed as from NUnits scope, becasue it is less than unit testing, but nonetheless :

Can there be any standard means by NUnit for database testing?

Something within the lines of moving back transactions made, or other solution I am unable to develop?

There's XtUnit but I'm not sure whether it works together with NUnit 2.5

MbUnit includes a built-in [Rollback], you might like to use MbUnit rather than NUnit for database testing.