graph/db: add versioned HasChannelEdge method

Add a new HasChannelEdge method that takes a gossip version parameter
and returns only existence and zombie status, without timestamp data.
This supports both v1 and v2 gossip protocols.

The original HasChannelEdge method is renamed to HasV1ChannelEdge to
preserve v1-specific functionality for callers that need timestamp
information. All call sites are updated accordingly.

The SQL store implementation now handles both gossip versions, using
timestamps for v1 and block heights for v2 policies, with proper
reject cache support for both versions.

graph/db/kv_store.go

@@ -1179,8 +1179,11 @@ func (c *KVStore) AddChannelEdge(ctx context.Context,
 			case alreadyExists:
 				return ErrEdgeAlreadyExist
 			default:
-				c.rejectCache.remove(lnwire.GossipVersion1, edge.ChannelID)
+				c.rejectCache.remove(
+					lnwire.GossipVersion1, edge.ChannelID,
+				)
 				c.chanCache.remove(edge.ChannelID)
+
 				return nil
 			}
 		},
@@ -1283,13 +1286,13 @@ func (c *KVStore) addChannelEdge(tx kvdb.RwTx,
 	return chanIndex.Put(b.Bytes(), chanKey[:])
 }
 
-// HasChannelEdge returns true if the database knows of a channel edge with the
-// passed channel ID, and false otherwise. If an edge with that ID is found
-// within the graph, then two time stamps representing the last time the edge
-// was updated for both directed edges are returned along with the boolean. If
-// it is not found, then the zombie index is checked and its result is returned
-// as the second boolean.
-func (c *KVStore) HasChannelEdge(
+// HasV1ChannelEdge returns true if the database knows of a channel edge
+// with the passed channel ID, and false otherwise. If an edge with that ID
+// is found within the graph, then two time stamps representing the last time
+// the edge was updated for both directed edges are returned along with the
+// boolean. If it is not found, then the zombie index is checked and its
+// result is returned as the second boolean.
+func (c *KVStore) HasV1ChannelEdge(
 	chanID uint64) (time.Time, time.Time, bool, bool, error) {
 
 	var (
@@ -1394,6 +1397,22 @@ func (c *KVStore) HasChannelEdge(
 	return upd1Time, upd2Time, exists, isZombie, nil
 }
 
+// HasChannelEdge returns true if the database knows of a channel edge with the
+// passed channel ID and gossip version, and false otherwise. If it is not
+// found, then the zombie index is checked and its result is returned as the
+// second boolean.
+func (c *KVStore) HasChannelEdge(v lnwire.GossipVersion,
+	chanID uint64) (bool, bool, error) {
+
+	if v != lnwire.GossipVersion1 {
+		return false, false, ErrVersionNotSupportedForKVDB
+	}
+
+	_, _, exists, isZombie, err := c.HasV1ChannelEdge(chanID)
+
+	return exists, isZombie, err
+}
+
 // AddEdgeProof sets the proof of an existing edge in the graph database.
 func (c *KVStore) AddEdgeProof(chanID lnwire.ShortChannelID,
 	proof *models.ChannelAuthProof) error {
@@ -3265,7 +3284,8 @@ func (c *KVStore) updateEdgeCache(e *models.ChannelEdgePolicy,
 	// the entry with the updated timestamp for the direction that was just
 	// written. If the edge doesn't exist, we'll load the cache entry lazily
 	// during the next query for this edge.
-	if entry, ok := c.rejectCache.get(lnwire.GossipVersion1, e.ChannelID); ok {
+	entry, ok := c.rejectCache.get(lnwire.GossipVersion1, e.ChannelID)
+	if ok {
 		if isUpdate1 {
 			entry.upd1Time = e.LastUpdate.Unix()
 		} else {