routing+server: expose DefaultChannelPruneExpiry

routing/router.go

@@ -33,6 +33,10 @@ const (
 	// if we should give up on a payment attempt. This will be used if a
 	// value isn't specified in the LightningNode struct.
 	defaultPayAttemptTimeout = time.Duration(time.Second * 60)
+
+	// DefaultChannelPruneExpiry is the default duration used to determine
+	// if a channel should be pruned or not.
+	DefaultChannelPruneExpiry = time.Duration(time.Hour * 24 * 14)
 )
 
 var (