Hello,

I have been previously running OTree experiments on a Heroku webpage with a linkage to OTree HR (https://hr.otreehub.com/) for payment information. 

Recently, I have been testing an experiment and though I can create the session and linkage with OTree HR, after a few hours, it appears that the session disappears on the Heroku site. Have any of you experienced this and is there a workaround for it?

Make sure to use a Postgres database. The SQLite database is deleted everytime a dyno restarts.