Previously database Backends used to appear on the Map view but they no longer appear.
10.5.1 + hotfixes and later
In 10.5.1 changes were made to the way Backends appear on the map to reduce congestion. Instead of being represented by a vertex they are now represented as an Edge.
What changed subsequent to that in a 10.5.1 hotfix (and 10.5.2) is that now unless the follow transaction path option is selected on the filter then unless the Backend is an intermediate component between to Front ends then it will not be displayed.
Due to a change in filtering in 10.5.1 hotfixes and included in 10.5.2 it is necessary to set the 'Follow Transaction Path' option on the universe filters for the Backend edges to appear where Backends are not intermediate between two Frontends in the transaction flow. See https://docops.ca.com/ca-apm/10-5/en/using/identify-areas-of-concern-using-filters/#IdentifyAreasofConcernUsingFilters-TransactionPathFilterSetaTransactionPathFilter for details on how to do this