db_log_cleaner is a rails plugin that filters out lots of db schema related logging. it is a more complete version of postgre_log_cleaner which filters out many more logs from postgres as well as some stuff from mysql.
why: rails, in development mode, spits out a ton of log messages. many of them are rails querying the db about the schema. these get in the way of application-specific logs and make it harder to get what you need.
how to use: just install the plugin; the rest it automatic.
install: script/plugin install http://svn.iprog.com/projects/rails/plugins/db_log_cleaner