Entity validation

Problem/Motivation

We should add entity validation when we import, create and update assets/logs. I don't expect there to be any issues, but it's possible there could be an issue if the JD API doesn't return a piece of data we are expecting.

The tricky part is updating batch operations to be compatible.

Steps to reproduce

N/A

Proposed resolution

Add entity validation.

Remaining tasks

Add entity validation.
Test.

User interface changes

Show validation errors in the UI (?)

API changes

None

Data model changes

None