feat: persist workflow timers and bounded poll rounds

internal/storage/mysql/workflow_consume.go

@@ -208,6 +208,13 @@ func (r *WorkflowRuntime) consume(ctx context.Context, tx *sql.Tx, g *workflowGr
 		if _, err := tx.ExecContext(ctx, `UPDATE weave_poll_states SET current_task_id=NULL,next_poll_at=?,resolved_at=?,revision=revision+1,updated_at=? WHERE namespace_id=? AND workflow_id=? AND activation_id=?`, next, settled, now, c.ns, c.workflow, source.activation); err != nil {
 			return false, err
 		}
+		if next != nil {
+			if err := saveWorkflowClock(ctx, tx, g, row, "POLL", row.view.Revision+1, *next); err != nil {
+				return false, err
+			}
+		} else if err := deleteWorkflowClock(ctx, tx, g, row); err != nil {
+			return false, err
+		}
 		if settled != nil {
 			waitState := "CANCELLED"
 			if state == weave.StepSucceeded {