Dropout payments
In the covid study, some participants withdraw without being paid the promised 9 EUR/hr on average. We have to identify those that dropped out and weren't paid enough, and pay them accordingly.
@yasynska, @zika and @krippner discuss who would like to have a go - this should be a python script so that we can later plug in the remaining sessions.
There is one tricky scenario: if they time-out we don't want to pay them for the time that they were not responding, this might require manual checking but it might also be possible to infer it from the data.