How model id is getting Populated through discovery for different classes?

Hello Experts,

Can anyone please explain me the entire process how discovery is populating model id through probes and through Patterns .

I did know there is script include AssetandCI through which discovery is populating model id but everytime we manually need to add the model ids and manufacturer in Product model table or is there any other way through which we are getting this.

I know discovery is searching in Product model table and according to the model category it populates the Model name in Model id field.

But everytime we need to maintain this table or discovery also maintains as when the discovery checks for model id and didn't find any then it inserts the unknown model id in many cases.

Also how can we stop discovery to populate "UNKNOWN" Model IDs in CI's in Patterns also.