I made a discovery. Have Datomic share with you the entity and the change delta of the database... use sente to send this change over sockets to the om.next clientside instance... om/transact! the change into the reconciler on every connected client ... and viola! real-time participation in one db. https://medium.com/adstage-engineering/realtime-apps-with-om-next-and-datomic-470be2c8204b#.exnunqc03