const int l_rev = m_flySQLiteDB.executeint("select max(rev) from fly_revision");
		const int l_db_user_version = m_flySQLiteDB.executeint("PRAGMA user_version");
		if (l_rev < 322)
		{
			safeAlter("ALTER TABLE fly_file add column hit int64 default 0");
			safeAlter("ALTER TABLE fly_file add column stamp_share int64 default 0");
			safeAlter("ALTER TABLE fly_file add column bitrate integer");
			m_flySQLiteDB.executenonquery("delete from fly_file where name like '%.mp3' and (bitrate=0 or bitrate is null)");
		}
		if (l_rev < 358)
		{
			safeAlter("ALTER TABLE fly_file add column ftype integer default -1");
			sqlite3_transaction l_trans(m_flySQLiteDB);
			m_flySQLiteDB.executenonquery("update fly_file set ftype=1 where ftype=-1 and "
			                              "(name like '%.mp3' or name like '%.ogg' or name like '%.wav' or name like '%.flac' or name like '%.wma')");
			m_flySQLiteDB.executenonquery("update fly_file set ftype=2 where ftype=-1 and "
			                              "(name like '%.rar' or name like '%.zip' or name like '%.7z' or name like '%.gz')");
......
}
.......

		if (l_db_user_version < 1)
		{
			// fix https://github.com/pavel-pimenov/flylinkdc-r5xx/issues/18
			m_flySQLiteDB.executenonquery("update fly_file set ftype=1 where name like '%.wv'");
			m_flySQLiteDB.executenonquery("PRAGMA user_version=1");
		}
		if (l_db_user_version < 3)
		{
			if (safeAlter("insert into fly_queue_source(fly_queue_id,CID,Nick) select id,CID,nick from fly_queue where nick is not null", true))
			{
				safeAlter("update fly_queue set nick=null, cid=null, CountSubSource=null where nick is not null", true);
			}
			m_flySQLiteDB.executenonquery("PRAGMA user_version=3");
		}