DB Entities - support clustered databases

Clustered databases do not return any results from Dexter. These can be viewed within the AppD UI, but are not available to return data via Dexter.

When viewing the url in the AppD UI there is an extra parameter: &databaseId=1902&dbCluster=true

Drilling down into one of the databases in the cluster via the UI the url updates: &databaseId=4052&dbClusterId=1902

Removing the &dbClusterId=1902 component still returns the same database statistics in the AppD UI.

Dexter is attempting to pull stats directly for the databaseId=1902 (collector=4112) which isn’t a real database, but a virtual construct of a cluster.

Start by tracing Dexter's database-entity retrieval for collector 4112 and compare the AppD UI parameters described in the issue, especially databaseId, dbCluster, and dbClusterId. Verify how clustered and member databases are represented, then confirm that cluster statistics can be returned instead of treating the virtual cluster as a real database.

Written by the indexing model from the issue text.