A system may involve a communication bus and computational instances configured for communication with one another by way of the communication bus. The system is configured to: (i) receive, by a first computational instance, a first communication request, wherein the first communication request specifies first attributes; (ii) store, in a first persistent storage, the first attributes; (iii) generate a second communication request that specifies second attributes; (iv) transmit, by the first computational instance and to a second computational instance by way of the communication bus, the second communication request; (v) receive, by the second computational instance, the second communication request; (vi) store, in a second persistent storage, the second attributes; (vii) generate a third communication request that specifies third attributes; and (viii) transmit, by the second computational instance and to a third computational instance by way of the communication bus, the third communication request.