Hi Julian,
I don’t know if the JDBC will behave the same way as the WebService connectors, but on the WebService Connector we use de attribute IIQDisabled attribute mapped to the account. This attribute defines the status of the account on IDN Screen.
This attribute it’s only true or false, so maybe you will have to create some data transformation using Rules or something.
Here it’s an article regarding this attribute using the WebService connector, maybe you can find some more information there Generic after rule for account status in webservice source