routing+discovery: implement 2-week network view pruning

routing/router.go

@@ -39,6 +39,9 @@ type ChannelGraphSource interface {
 	// edge/channel might be used in construction of payment path.
 	AddEdge(edge *channeldb.ChannelEdgeInfo) error
 
+	// DeleteEdge is used to delete an edge from the router database.
+	DeleteEdge(edge *channeldb.ChannelEdgeInfo) error
+
 	// AddProof updates the channel edge info with proof which is needed to
 	// properly announce the edge to the rest of the network.
 	AddProof(chanID lnwire.ShortChannelID, proof *channeldb.ChannelAuthProof) error
@@ -1294,6 +1297,13 @@ func (r *ChannelRouter) AddEdge(edge *channeldb.ChannelEdgeInfo) error {
 	}
 }
 
+// DeleteEdge is used to delete an edge from the router database.
+//
+// NOTE: This method is part of the ChannelGraphSource interface.
+func (r *ChannelRouter) DeleteEdge(edge *channeldb.ChannelEdgeInfo) error {
+	return r.cfg.Graph.DeleteChannelEdge(&edge.ChannelPoint)
+}
+
 // UpdateEdge is used to update edge information, without this message edge
 // considered as not fully constructed.
 //