An embodiment may involve: transmitting a first graphical user interface (GUI) that allows selection of a plurality of item streams for a mobile user interface; receiving a selection of a first item stream; transmitting a second GUI, where the first item stream is populated from a first database table and the second GUI allows selection of a first field from the first database table; receiving a selection of a second item stream; transmitting the second GUI, where the second item stream is populated from a second database table and the second GUI allows selection of a second field from the second database table, where the first and second fields are of a common type; and transmitting, to a mobile device, the mobile user interface with items from the first and second item streams sorted according to values in the first and second fields.