lib/state.js
function expire() {
  var dbs = this._store.databases, i;
  for(i in dbs) {
    dbs[i].delExpiredKeys();
  }
}
function expire() {
  var dbs = this._store.databases, i;
  for(i in dbs) {
    dbs[i].delExpiredKeys();
  }
}
function expire ( ) { var dbs = this . _store . databases , i ; for ( i in dbs ) { dbs [ i ] . delExpiredKeys ( ) ; } }
Scheduler tick event that handles expiring keys.

Passive expiry.
Scheduler tick event that handles expiring keys .