[aron9forever]

well first, you're probably going to want to update to amxmodx 1.8.3 and use the new client_disconnected() instead of _disconnect, which does not get called in a very few special cases of dropped players


then, you might also add a periodic check, such as, once every 2 minutes, check the database for all players that have
WHERE join_time > leave_time (in the case of timestamps, this would only happen if a player joined but hasn't left yet, all valid data should have join_time <= leave_time assuming players can't time travel), if you find any, check if they are still on the server, if not, write the new leave_time


not sure if the logic is sound but I just gave it a minute of thinking and this is what my first approach would be