[#661] blobovniczatree: Use .db extension for db files

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/blobstor/blobovniczatree/iterate.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"path/filepath"
+	"strings"
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
@@ -54,7 +55,7 @@ func (b *Blobovniczas) Iterate(ctx context.Context, prm common.IteratePrm) (comm
 				return prm.Handler(common.IterationElement{
 					Address:    elem.Address(),
 					ObjectData: data,
-					StorageID:  []byte(p),
+					StorageID:  []byte(strings.TrimSuffix(p, dbExtension)),
 				})
 			}
 			return nil
@@ -140,10 +141,16 @@ func (b *Blobovniczas) iterateSorted(ctx context.Context, addr *oid.Address, cur
 			return false, ctx.Err()
 		default:
 		}
+
+		lastPart := u64ToHexString(indices[i])
+		if isLeafLevel {
+			lastPart = u64ToHexStringExt(indices[i])
+		}
+
 		if i == 0 {
-			curPath = append(curPath, u64ToHexString(indices[i]))
+			curPath = append(curPath, lastPart)
 		} else {
-			curPath[len(curPath)-1] = u64ToHexString(indices[i])
+			curPath[len(curPath)-1] = lastPart
 		}
 
 		if exec {