create migration script for old data

scnserver/db/impl/requests/database.go

@@ -42,7 +42,9 @@ func NewRequestsDatabase(cfg server.Config) (*Database, error) {
 
 	qqdb := sq.NewDB(xdb)
 
-	qqdb.AddListener(dbtools.DBLogger{})
+	if conf.EnableLogger {
+		qqdb.AddListener(dbtools.DBLogger{})
+	}
 
 	pp, err := dbtools.NewDBPreprocessor(qqdb)
 	if err != nil {
@@ -56,6 +58,10 @@ func NewRequestsDatabase(cfg server.Config) (*Database, error) {
 	return scndb, nil
 }
 
+func (db *Database) DB() sq.DB {
+	return db.db
+}
+
 func (db *Database) Migrate(ctx context.Context) error {
 	ctx, cancel := context.WithTimeout(context.Background(), 24*time.Second)
 	defer cancel()