title: Importing data from files to database by the users of the site
body: <p>It's necessary to allow users to import their data on the site (in mysql database). Every user who logs in, can import data from a file to the database and then work with them on the site. It takes a long time to import the data and creates a high load on the database as well.
  Could you please tell how to queue importing better? So the data would be imported at one online, but to queue data to be written periodically to the database. 
  Thank you.</p>