A system includes establishment of a WebSocket connection at a WebSocket endpoint of the system with a WebSocket client, registration of a callback at the WebSocket endpoint for an event associated with an update to data of the database, identification of an update to the data of the database at an HTTP endpoint of the system, sending, in response to the identification of the update, a trigger event from the HTTP endpoint, reception of the trigger event at the WebSocket endpoint, and execution of the callback by the WebSocket endpoint to transmit the update to the WebSocket client.