app_main/lib/mongodb.js: rework (re)connection to be better
uncaughtException: try to `res.json()` to UI from business logic bugs
proxy/CRUD.js: diff application and fatal errors

app error example on backend:

  if(opts.upsert){
     for(i = 0; i < arr.length; ++i) if(re.test(arr[i].name)){
         return next('_exists')//app error
     }
  }
elaborate dee999e5b8cf94fe37781087d0f33242864f4498
Session Time: enable by default; don't logout in UI on reload/unload/close