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/graph.go

@@ -661,11 +661,18 @@ func (c *ChannelGraph) DisabledChannelIDs() ([]uint64, error) {
 	return c.db.DisabledChannelIDs()
 }
 
-// HasChannelEdge returns true if the database knows of a channel edge.
-func (c *ChannelGraph) HasChannelEdge(chanID uint64) (time.Time, time.Time,
-	bool, bool, error) {
+// HasV1ChannelEdge returns true if the database knows of a channel edge.
+func (c *ChannelGraph) HasV1ChannelEdge(chanID uint64) (time.Time,
+	time.Time, bool, bool, error) {
 
-	return c.db.HasChannelEdge(chanID)
+	return c.db.HasV1ChannelEdge(chanID)
+}
+
+// HasChannelEdge returns true if the database knows of a channel edge.
+func (c *ChannelGraph) HasChannelEdge(v lnwire.GossipVersion,
+	chanID uint64) (bool, bool, error) {
+
+	return c.db.HasChannelEdge(v, chanID)
 }
 
 // AddEdgeProof sets the proof of an existing edge in the graph database.
@@ -889,6 +896,14 @@ func (c *VersionedGraph) DeleteChannelEdges(strictZombiePruning,
 	return err
 }
 
+// HasChannelEdge returns true if the database knows of a channel edge with the
+// passed channel ID and this graph's 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 *VersionedGraph) HasChannelEdge(chanID uint64) (bool, bool, error) {
+	return c.db.HasChannelEdge(c.v, chanID)
+}
+
 // IsPublicNode determines whether the node is seen as public in the graph.
 func (c *VersionedGraph) IsPublicNode(pubKey [33]byte) (bool, error) {
 	return c.db.IsPublicNode(c.v, pubKey)