old_contents: module.exports = function(database) {
  // --------------------------------------------------------------------------------------
    const CronJob = require('cron').CronJob;
    const mail = require('./mail');
    const failed_logins = require('./cron/failed_logins.js');
    const invalid_records = require('./cron/invalid_records.js');
    const mac_count = require('./cron/mac_count.js');
    const roaming = require('./cron/roaming.js');
    //const stats = require('./cron/stats.js'); // TODO
    const users_mac = require('./cron/users_mac.js');
    const request = require('./request');
  // --------------------------------------------------------------------------------------
    // TODO
    // once a month
    new CronJob('0 00 06 1 * *', function() {     // run once a month
      // TODO
      // administrative contacts logic
      //mail.send_mail_to_realm_admins(database, request.get_failed_logins_monthly, 100);
      //mail.send_mail_to_realm_admins(database, request.get_invalid_records_monthly);
    }, null, true, 'Europe/Prague');
  
  // --------------------------------------------------------------------------------------
  
    // TODO - invalid data - once a day
    // send mail about invalid data - once a month ? or configurable time ?
  
    //new CronJob('0 30 02 * * 0', function() {     // run once every week at 02:30:00
    // TODO
    //}, null, true, 'Europe/Prague');
  
  // --------------------------------------------------------------------------------------
    // run once a day
    // should be run at more than Date.getTimezoneOffset(); [javascript method] minutes from midnight
    // to prevent inconsistent data - localtime/UTC conversion issue
  // --------------------------------------------------------------------------------------
    new CronJob('0 05 02 * * *', function() {     // run at 02:05:00
      failed_logins.process_current_data(database);
    }, null, true, 'Europe/Prague');
  
    new CronJob('0 10 02 * * *', function() {     // run at 02:10:00
      invalid_records.process_current_data(database);
    }, null, true, 'Europe/Prague');
  
    new CronJob('0 15 02 * * *', function() {     // run at 02:15:00
      mac_count.process_current_data(database);
    }, null, true, 'Europe/Prague');
  
    new CronJob('0 20 02 * * *', function() {     // run at 02:20:00
      roaming.process_current_data(database);
    }, null, true, 'Europe/Prague');
  
  // --------------------------------------------------------------------------------------
    // mac to user mapping is run more often
    new CronJob('0 */15 * * * *', function() {   // every 15 minutes
      users_mac.process_current_data(database, 900); // every 15 minutes
    }, null, true, 'Europe/Prague');
  
  // --------------------------------------------------------------------------------------
  
    // TODO - automatic data retention -> delete older data:
    // logs itself after a year ?
    // invalid data after .. ?
    // 
  }
  // --------------------------------------------------------------------------------------
  
new_contents: module.exports = function(database) {
  // --------------------------------------------------------------------------------------
    const CronJob = require('cron').CronJob;
    const mail = require('./mail');
    const failed_logins = require('./cron/failed_logins.js');
    const mac_count = require('./cron/mac_count.js');
    const roaming = require('./cron/roaming.js');
    //const stats = require('./cron/stats.js'); // TODO
    const users_mac = require('./cron/users_mac.js');
    const request = require('./request');
  // --------------------------------------------------------------------------------------
    // TODO
    // once a month
    new CronJob('0 00 06 1 * *', function() {     // run once a month
      // TODO
      // administrative contacts logic
      //mail.send_mail_to_realm_admins(database, request.get_failed_logins_monthly, 100);
      //mail.send_mail_to_realm_admins(database, request.get_invalid_records_monthly);
    }, null, true, 'Europe/Prague');
  
  // --------------------------------------------------------------------------------------
  
    // TODO - invalid data - once a day
    // send mail about invalid data - once a month ? or configurable time ?
  
    //new CronJob('0 30 02 * * 0', function() {     // run once every week at 02:30:00
    // TODO
    //}, null, true, 'Europe/Prague');
  
  // --------------------------------------------------------------------------------------
    // run once a day
    // should be run at more than Date.getTimezoneOffset(); [javascript method] minutes from midnight
    // to prevent inconsistent data - localtime/UTC conversion issue
  // --------------------------------------------------------------------------------------
    new CronJob('0 05 02 * * *', function() {     // run at 02:05:00
      failed_logins.process_current_data(database);
    }, null, true, 'Europe/Prague');
  
    new CronJob('0 15 02 * * *', function() {     // run at 02:15:00
      mac_count.process_current_data(database);
    }, null, true, 'Europe/Prague');
  
    new CronJob('0 20 02 * * *', function() {     // run at 02:20:00
      roaming.process_current_data(database);
    }, null, true, 'Europe/Prague');
  
  // --------------------------------------------------------------------------------------
    // mac to user mapping is run more often
    new CronJob('0 */15 * * * *', function() {   // every 15 minutes
      users_mac.process_current_data(database, 900); // every 15 minutes
    }, null, true, 'Europe/Prague');
  
  // --------------------------------------------------------------------------------------
  
    // TODO - automatic data retention -> delete older data:
    // logs itself after a year ?
    // invalid data after .. ?
    // 
  }
  // --------------------------------------------------------------------------------------
  
subject: remove invalid records processing