diff --git a/graph/db/graph_test.go b/graph/db/graph_test.go
index 419c96bc3..12d9ef109 100644
--- a/graph/db/graph_test.go
+++ b/graph/db/graph_test.go
@@ -1128,7 +1128,7 @@ func TestAddEdgeProof(t *testing.T) {
 	t.Parallel()
 	ctx := context.Background()
 
-	graph := MakeTestGraph(t)
+	graph := MakeTestGraphNew(t)
 
 	// Add an edge with no proof.
 	node1 := createTestVertex(t)
diff --git a/graph/db/sql_store.go b/graph/db/sql_store.go
index a6c67948c..bfd2b0125 100644
--- a/graph/db/sql_store.go
+++ b/graph/db/sql_store.go
@@ -91,6 +91,7 @@ type SQLQueries interface {
 		Channel queries.
 	*/
 	CreateChannel(ctx context.Context, arg sqlc.CreateChannelParams) (int64, error)
+	AddV1ChannelProof(ctx context.Context, arg sqlc.AddV1ChannelProofParams) (sql.Result, error)
 	GetChannelBySCID(ctx context.Context, arg sqlc.GetChannelBySCIDParams) (sqlc.Channel, error)
 	GetChannelByOutpoint(ctx context.Context, outpoint string) (sqlc.GetChannelByOutpointRow, error)
 	GetChannelsBySCIDRange(ctx context.Context, arg sqlc.GetChannelsBySCIDRangeParams) ([]sqlc.GetChannelsBySCIDRangeRow, error)
@@ -2575,6 +2576,54 @@ func (s *SQLStore) DisconnectBlockAtHeight(height uint32) (
 	return removedChans, nil
 }
 
+// AddEdgeProof sets the proof of an existing edge in the graph database.
+//
+// NOTE: part of the V1Store interface.
+func (s *SQLStore) AddEdgeProof(scid lnwire.ShortChannelID,
+	proof *models.ChannelAuthProof) error {
+
+	var (
+		ctx       = context.TODO()
+		scidBytes = channelIDToBytes(scid.ToUint64())
+	)
+
+	err := s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
+		res, err := db.AddV1ChannelProof(
+			ctx, sqlc.AddV1ChannelProofParams{
+				Scid:              scidBytes[:],
+				Node1Signature:    proof.NodeSig1Bytes,
+				Node2Signature:    proof.NodeSig2Bytes,
+				Bitcoin1Signature: proof.BitcoinSig1Bytes,
+				Bitcoin2Signature: proof.BitcoinSig2Bytes,
+			},
+		)
+		if err != nil {
+			return fmt.Errorf("unable to add edge proof: %w", err)
+		}
+
+		n, err := res.RowsAffected()
+		if err != nil {
+			return err
+		}
+
+		if n == 0 {
+			return fmt.Errorf("no rows affected when adding edge "+
+				"proof for SCID %v", scid)
+		} else if n > 1 {
+			return fmt.Errorf("multiple rows affected when adding "+
+				"edge proof for SCID %v: %d rows affected",
+				scid, n)
+		}
+
+		return nil
+	}, sqldb.NoOpReset)
+	if err != nil {
+		return fmt.Errorf("unable to add edge proof: %w", err)
+	}
+
+	return nil
+}
+
 // forEachNodeDirectedChannel iterates through all channels of a given
 // node, executing the passed callback on the directed edge representing the
 // channel and its incoming policy. If the node is not found, no error is
diff --git a/sqldb/sqlc/graph.sql.go b/sqldb/sqlc/graph.sql.go
index c74b4c050..2f0380294 100644
--- a/sqldb/sqlc/graph.sql.go
+++ b/sqldb/sqlc/graph.sql.go
@@ -26,6 +26,34 @@ func (q *Queries) AddSourceNode(ctx context.Context, nodeID int64) error {
 	return err
 }
 
+const addV1ChannelProof = `-- name: AddV1ChannelProof :execresult
+UPDATE channels
+SET node_1_signature = $2,
+    node_2_signature = $3,
+    bitcoin_1_signature = $4,
+    bitcoin_2_signature = $5
+WHERE scid = $1
+  AND version = 1
+`
+
+type AddV1ChannelProofParams struct {
+	Scid              []byte
+	Node1Signature    []byte
+	Node2Signature    []byte
+	Bitcoin1Signature []byte
+	Bitcoin2Signature []byte
+}
+
+func (q *Queries) AddV1ChannelProof(ctx context.Context, arg AddV1ChannelProofParams) (sql.Result, error) {
+	return q.db.ExecContext(ctx, addV1ChannelProof,
+		arg.Scid,
+		arg.Node1Signature,
+		arg.Node2Signature,
+		arg.Bitcoin1Signature,
+		arg.Bitcoin2Signature,
+	)
+}
+
 const countZombieChannels = `-- name: CountZombieChannels :one
 SELECT COUNT(*)
 FROM zombie_channels
diff --git a/sqldb/sqlc/querier.go b/sqldb/sqlc/querier.go
index f0e1ad3e7..f166904da 100644
--- a/sqldb/sqlc/querier.go
+++ b/sqldb/sqlc/querier.go
@@ -12,6 +12,7 @@ import (
 
 type Querier interface {
 	AddSourceNode(ctx context.Context, nodeID int64) error
+	AddV1ChannelProof(ctx context.Context, arg AddV1ChannelProofParams) (sql.Result, error)
 	ClearKVInvoiceHashIndex(ctx context.Context) error
 	CountZombieChannels(ctx context.Context, version int16) (int64, error)
 	CreateChannel(ctx context.Context, arg CreateChannelParams) (int64, error)
diff --git a/sqldb/sqlc/queries/graph.sql b/sqldb/sqlc/queries/graph.sql
index 67b5dae6b..6281ea0ab 100644
--- a/sqldb/sqlc/queries/graph.sql
+++ b/sqldb/sqlc/queries/graph.sql
@@ -208,6 +208,15 @@ INSERT INTO channels (
 )
 RETURNING id;
 
+-- name: AddV1ChannelProof :execresult
+UPDATE channels
+SET node_1_signature = $2,
+    node_2_signature = $3,
+    bitcoin_1_signature = $4,
+    bitcoin_2_signature = $5
+WHERE scid = $1
+  AND version = 1;
+
 -- name: GetChannelsBySCIDRange :many
 SELECT sqlc.embed(c),
     n1.pub_key AS node1_pub_key,