http://sourceforge.net/project/showfiles.php?group_id=74624

What is Madeleine?

  "Are you still using a database?"

  Madeleine is a Ruby implementation of Object Prevalence: 
  Transparent persistence of business objects using command
  logging and snapshots.

  http://madeleine.sourceforge.net/

Hi everyone!

A new release of Madeleine is now available. There has been a lot of
internal changes since the last release, but the user-visible changes
are (hopefully) limited to the ones listed below.

News in Madeleine 0.6:

    * Changed license to BSD
    * Added a RubyGem specification
    * Re-designed initialization (but still backward-compatible)
    * Bug fix: Fixed use of finalized object's id in AutomaticSnapshotMadeleine

/Anders