multi: add more logging when fetching invoices and payments.

routing/control_tower.go

@@ -365,10 +365,13 @@ func (p *controlTower) SubscribeAllPayments() (ControlTowerSubscriber, error) {
 	p.subscriberIndex++
 	p.subscribersMtx.Unlock()
 
+	log.Debugf("Scanning for inflight payments")
 	inflightPayments, err := p.db.FetchInFlightPayments()
 	if err != nil {
 		return nil, err
 	}
+	log.Debugf("Scanning for inflight payments finished",
+		len(inflightPayments))
 
 	for index := range inflightPayments {
 		// Always write current payment state to the channel.

routing/router.go

@@ -1400,11 +1400,15 @@ func (r *ChannelRouter) BuildRoute(amt fn.Option[lnwire.MilliSatoshi],
 // lifecycles.
 func (r *ChannelRouter) resumePayments() error {
 	// Get all payments that are inflight.
+	log.Debugf("Scanning for inflight payments")
 	payments, err := r.cfg.Control.FetchInFlightPayments()
 	if err != nil {
 		return err
 	}
 
+	log.Debugf("Scanning finished, found %d inflight payments",
+		len(payments))
+
 	// Before we restart existing payments and start accepting more
 	// payments to be made, we clean the network result store of the
 	// Switch. We do this here at startup to ensure no more payments can be