Add ValueStore interface.

go/store/prolly/tree/node_store.go

@@ -15,7 +15,9 @@
 package tree
 
 import (
+	"bytes"
 	"context"
+	"github.com/dolthub/dolt/go/store/val"
 	"sync"
 
 	"github.com/dolthub/dolt/go/store/prolly/message"
@@ -32,6 +34,8 @@ const (
 
 // NodeStore reads and writes prolly tree Nodes.
 type NodeStore interface {
+	val.ValueStore
+
 	// Read reads a prolly tree Node from the store.
 	Read(ctx context.Context, ref hash.Hash) (Node, error)
 
@@ -204,3 +208,14 @@ func (ns nodeStore) Format() *types.NomsBinFormat {
 func (ns nodeStore) PurgeCaches() {
 	ns.cache.purge()
 }
+
+func (ns nodeStore) ReadBytes(ctx context.Context, h hash.Hash) ([]byte, error) {
+	return NewByteArray(h, ns).ToBytes(ctx)
+}
+
+func (ns nodeStore) WriteBytes(ctx context.Context, b []byte) (hash.Hash, error) {
+	_, h, err := SerializeBytesToAddr(ctx, ns, bytes.NewReader(b), len(b))
+	return h, err
+}
+
+var _ val.ValueStore = nodeStore{}

go/store/prolly/tree/testutils.go

@@ -272,6 +272,14 @@ type nodeStoreValidator struct {
 	bbp *sync.Pool
 }
 
+func (v nodeStoreValidator) ReadBytes(ctx context.Context, h hash.Hash) ([]byte, error) {
+	panic("not implemented")
+}
+
+func (v nodeStoreValidator) WriteBytes(ctx context.Context, val []byte) (hash.Hash, error) {
+	panic("not implemented")
+}
+
 func (v nodeStoreValidator) Read(ctx context.Context, ref hash.Hash) (Node, error) {
 	nd, err := v.ns.Read(ctx, ref)
 	if err != nil {

go/store/val/value_store.go

@@ -0,0 +1,25 @@
+// Copyright 2025 Dolthub, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package val
+
+import (
+	"context"
+	"github.com/dolthub/dolt/go/store/hash"
+)
+
+type ValueStore interface {
+	ReadBytes(ctx context.Context, h hash.Hash) ([]byte, error)
+	WriteBytes(ctx context.Context, val []byte) (hash.Hash, error)
+}