when user delete account Tournament DB replace name as 'Unknown'
if the tournament hasn't been started :
if deleted user was a host: Tournament deleted
else : player deleted from tournament
if tournamaent started:
if match is playing : replace name 'Unknown' after the playing match finished, and exclude for the next round
for next round generation, if there are not enough players for the next match: empty match will be deleted
when user delete account Tournament DB replace name as 'Unknown'
if the tournament hasn't been started : if deleted user was a host: Tournament deleted else : player deleted from tournament
if tournamaent started: if match is playing : replace name 'Unknown' after the playing match finished, and exclude for the next round for next round generation, if there are not enough players for the next match: empty match will be deleted
for finished tournament: replace username.