Hi, I have two hub, data engine and dap must be only on one hub? or must to be installed also on the second hub and set the same db as the first hub?
dap usually ties to dashboard_engine, but did you actually mean data_engine?
As far as I know, dap (and dashboard_engine) are both deprecated, so I guess you should have 0 (unless you are using some of the deprecated functionality).
When it comes to data_engine, it should support running more than one, but we are just running one active at a time, and use HA probe to activate it on the passive hub should it take over. data_engine probably shouldn't be deployed to all hubs (as a rule of thumb at least, but there is always exceptions).