You will dins sql file at
/home/httpd/html/horde/scripts/db
What you could do is
1 - Backup your existing horde-db
# mysqldump -c horde > /path/to/horde.sql
2 - find out MySQL user for horde (OBS!!! output from command below will show MySQL password for user horde
# /sbin/e-smith/config show horde
3 - Run mysql_create.sql
# mysql --user=horde --password=<MySQL-password> < mysql_create.sql