Maintaining the database

I spotted a flaw in this great platform elgg, after developing 2 sites I noticed that the database is Cmplex impossible to empty table without making mistakes, the databases are limited so it is mo essential to create a plugin to remove the information from the site, a kind of maintenance of the database. For example for private messages of sites, the wire, message board and other ... to sum it be a plugin that destroy information is a Sytème date more radically comprehensive data entity. I count on the community to develop this point is essential to community development.
DeSolla for spelling errors I'm French
Thank you in advance