It is possible to add OnPlayerBan and OnPlayerUnban hooks?

I just got an idea to make a plugin that will send player SteamIDs to the database to show the ban list at the website, but no hooks available to do that on-demand. Another possible way is to read BannedPlayers.cfg regularly at some time, however, this will be a bit tough operation to send to the MySQL database if we have tons of banned players.