add run heartbeat keepalive and broadcast logic to cover for missing updates from db (#441)

Author: saikonen

services/ui_backend_service/api/notify.py

@@ -95,6 +95,10 @@ async def handle_trigger_msg(self, msg: str):
                 # Heartbeat watcher for Tasks.
                 if table.table_name == self.db.task_table_postgres.table_name:
                     self.event_emitter.emit('task-heartbeat', 'update', data)
+                    # also keepalive for run heartbeats.
+                    self.event_emitter.emit('run-heartbeat', 'update', data)
+                    # also broadcast as a run heartbeat update, as otherwise these receive no updates
+                    await _broadcast(self.event_emitter, "UPDATE", self.db.run_table_postgres.table_name, data)
 
                 # Notify when Run parameters are ready.
                 if operation == "INSERT" and \