One more notice:

limiting number of queries per hour for different users has been done
on 4.0.1 , but I can port it to 3.23.* 

This will require only certain changes, like number of columns in user
table.

I will also make a test case for it, after it is approved by Monty, 
as result file will depend on the error message text.


BitKeeper/etc/ignore:
  auto-union
libmysqld/lib_sql.cc:
  Auto merged
scripts/mysql_install_db.sh:
  Auto merged
sql/item_timefunc.h:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql/sql_acl.cc:
  Auto merged
sql/sql_acl.h:
  Auto merged
sql/sql_select.cc:
  Auto merged
sql/sql_update.cc:
  Auto merged
sql/mysql_priv.h:
  Auto merged
sql/lex.h:
  Changes for BitKeeper resolve...
sql/sql_class.h:
  Changes for BitKeeper resolve...
sql/sql_lex.h:
  Changes for BitKeeper resolve...
sql/sql_parse.cc:
  Changes for BitKeeper resolve...
sql/sql_yacc.yy:
  Changes for BitKeeper resolve...