Based on http://blog.codeborne.com/2011/10/etherpad-lite-migrate-data-from-dirtydb.html but more cautious. Includes a delay so the db has a chance to flush.

migrate-dirtydb-to-any-database-using-ueber.js

var dirty = require("dirty")('./var/dirty.db')
var ueber = require("./db/DB")

ueber.init(function() {

  console.log('ueber initialized')
  var db = ueber.db
  
  dirty.on("load", function() {
    console.log('dirty load complete')
  
    var keys = []
    var vals = []
    dirty.forEach(function(key, val) {
      keys.push(key)
      vals.push(val)
    })
    console.log('finished loading dirty database into memory')
    console.log('key has length of ' + keys.length)
    function next() {
      var key = keys.shift()
      var val = vals.shift()
      setTimeout(function() {
        db.set(key, val)
        if (keys.length > 0) {
         next()
        }
        else {
          console.log('fin')
          exit()
        }
      }, 50)
    }
    next()
  })

})