graph/db: thread context through NodeUpdatesInHorizon

diff --git a/discovery/chan_series.go b/discovery/chan_series.go
index ed64453..4d35a4f 100644
--- a/discovery/chan_series.go
+++ b/discovery/chan_series.go
@@ -181,7 +181,8 @@ func (c *ChanSeries) UpdatesInHorizon(chain chainhash.Hash,
 		// update within the horizon as well. We send these second to
 		// ensure that they follow any active channels they have.
 		nodeAnnsInHorizon := c.graph.NodeUpdatesInHorizon(
-			startTime, endTime, graphdb.WithIterPublicNodesOnly(),
+			context.TODO(), startTime, endTime,
+			graphdb.WithIterPublicNodesOnly(),
 		)
 		for nodeAnn, err := range nodeAnnsInHorizon {
 			if err != nil {
diff --git a/graph/db/benchmark_test.go b/graph/db/benchmark_test.go
index 2887b7d..74d3ba2 100644
--- a/graph/db/benchmark_test.go
+++ b/graph/db/benchmark_test.go
@@ -659,7 +659,7 @@ func BenchmarkGraphReadMethods(b *testing.B) {
 			name: "NodeUpdatesInHorizon",
 			fn: func(b testing.TB, store Store) {
 				iter := store.NodeUpdatesInHorizon(
-					time.Unix(0, 0), time.Now(),
+					ctx, time.Unix(0, 0), time.Now(),
 				)
 				_, err := fn.CollectErr(iter)
 				require.NoError(b, err)
diff --git a/graph/db/graph.go b/graph/db/graph.go
index acafbcc..1173c7a 100644
--- a/graph/db/graph.go
+++ b/graph/db/graph.go
@@ -633,10 +633,11 @@ func (c *ChannelGraph) ForEachNodeCacheable(ctx context.Context,
 
 // NodeUpdatesInHorizon returns all known lightning nodes with updates in the
 // range.
-func (c *ChannelGraph) NodeUpdatesInHorizon(startTime, endTime time.Time,
+func (c *ChannelGraph) NodeUpdatesInHorizon(ctx context.Context,
+	startTime, endTime time.Time,
 	opts ...IteratorOption) iter.Seq2[*models.Node, error] {
 
-	return c.db.NodeUpdatesInHorizon(startTime, endTime, opts...)
+	return c.db.NodeUpdatesInHorizon(ctx, startTime, endTime, opts...)
 }
 
 // HasV1Node determines if the graph has a vertex identified by the target node
diff --git a/graph/db/graph_test.go b/graph/db/graph_test.go
index 737376b..7a719a2 100644
--- a/graph/db/graph_test.go
+++ b/graph/db/graph_test.go
@@ -2540,7 +2540,7 @@ func TestNodeUpdatesInHorizon(t *testing.T) {
 	// If we issue an arbitrary query before we insert any nodes into the
 	// database, then we shouldn't get any results back.
 	nodeUpdatesIter := graph.NodeUpdatesInHorizon(
-		time.Unix(999, 0), time.Unix(9999, 0),
+		ctx, time.Unix(999, 0), time.Unix(9999, 0),
 	)
 	nodeUpdates, err := fn.CollectErr(nodeUpdatesIter)
 	require.NoError(t, err, "unable to query for node updates")
@@ -2615,7 +2615,7 @@ func TestNodeUpdatesInHorizon(t *testing.T) {
 	}
 	for _, queryCase := range queryCases {
 		iter := graph.NodeUpdatesInHorizon(
-			queryCase.start, queryCase.end,
+			ctx, queryCase.start, queryCase.end,
 		)
 
 		resp, err := fn.CollectErr(iter)
@@ -2743,7 +2743,7 @@ func testNodeUpdatesWithBatchSize(t *testing.T, ctx context.Context,
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 			iter := testGraph.NodeUpdatesInHorizon(
-				tc.start, tc.end,
+				ctx, tc.start, tc.end,
 				WithNodeUpdateIterBatchSize(
 					batchSize,
 				),
@@ -2816,7 +2816,7 @@ func TestNodeUpdatesInHorizonEarlyTermination(t *testing.T) {
 	for _, stopAt := range terminationPoints {
 		t.Run(fmt.Sprintf("StopAt%d", stopAt), func(t *testing.T) {
 			iter := graph.NodeUpdatesInHorizon(
-				startTime, startTime.Add(200*time.Hour),
+				ctx, startTime, startTime.Add(200*time.Hour),
 				WithNodeUpdateIterBatchSize(10),
 			)
 
@@ -4091,7 +4091,9 @@ func TestNodePruningUpdateIndexDeletion(t *testing.T) {
 	// update time of our test node.
 	startTime := time.Unix(9, 0)
 	endTime := node1.LastUpdate.Add(time.Minute)
-	nodesInHorizonIter := graph.NodeUpdatesInHorizon(startTime, endTime)
+	nodesInHorizonIter := graph.NodeUpdatesInHorizon(
+		ctx, startTime, endTime,
+	)
 
 	// We should only have a single node, and that node should exactly
 	// match the node we just inserted.
@@ -4107,7 +4109,9 @@ func TestNodePruningUpdateIndexDeletion(t *testing.T) {
 
 	// Now that the node has been deleted, we'll again query the nodes in
 	// the horizon. This time we should have no nodes at all.
-	nodesInHorizonIter = graph.NodeUpdatesInHorizon(startTime, endTime)
+	nodesInHorizonIter = graph.NodeUpdatesInHorizon(
+		ctx, startTime, endTime,
+	)
 	nodesInHorizon, err = fn.CollectErr(nodesInHorizonIter)
 	require.NoError(t, err, "unable to fetch nodes in horizon")
 	require.Empty(t, nodesInHorizon)
diff --git a/graph/db/interfaces.go b/graph/db/interfaces.go
index 897b56a..4983c9c 100644
--- a/graph/db/interfaces.go
+++ b/graph/db/interfaces.go
@@ -122,7 +122,7 @@ type Store interface { //nolint:interfacebloat
 	// an update timestamp within the passed range. This method can be used
 	// by two nodes to quickly determine if they have the same set of up to
 	// date node announcements.
-	NodeUpdatesInHorizon(startTime, endTime time.Time,
+	NodeUpdatesInHorizon(ctx context.Context, startTime, endTime time.Time,
 		opts ...IteratorOption) iter.Seq2[*models.Node, error]
 
 	// FetchNode attempts to look up a target node by its identity
diff --git a/graph/db/kv_store.go b/graph/db/kv_store.go
index ceb2b67..5a27ee9 100644
--- a/graph/db/kv_store.go
+++ b/graph/db/kv_store.go
@@ -2627,7 +2627,7 @@ func (c *KVStore) fetchNextNodeBatch(
 
 // NodeUpdatesInHorizon returns all the known lightning node which have an
 // update timestamp within the passed range.
-func (c *KVStore) NodeUpdatesInHorizon(startTime,
+func (c *KVStore) NodeUpdatesInHorizon(_ context.Context, startTime,
 	endTime time.Time,
 	opts ...IteratorOption) iter.Seq2[*models.Node, error] {
 
diff --git a/graph/db/sql_store.go b/graph/db/sql_store.go
index 77863d7..0235165 100644
--- a/graph/db/sql_store.go
+++ b/graph/db/sql_store.go
@@ -610,7 +610,8 @@ func (s *SQLStore) SetSourceNode(ctx context.Context,
 // announcements.
 //
 // NOTE: This is part of the Store interface.
-func (s *SQLStore) NodeUpdatesInHorizon(startTime, endTime time.Time,
+func (s *SQLStore) NodeUpdatesInHorizon(ctx context.Context,
+	startTime, endTime time.Time,
 	opts ...IteratorOption) iter.Seq2[*models.Node, error] {
 
 	cfg := defaultIteratorConfig()
@@ -620,7 +621,6 @@ func (s *SQLStore) NodeUpdatesInHorizon(startTime, endTime time.Time,
 
 	return func(yield func(*models.Node, error) bool) {
 		var (
-			ctx            = context.TODO()
 			lastUpdateTime sql.NullInt64
 			lastPubKey     = make([]byte, 33)
 			hasMore        = true