I used a manual timetable https://www.fusolab.net/chi-siamo/orario?id=3&view=planning (i have to manually change hours of each activity).
Since we need to add activities at the beginning of the day, I need to add a line between two rows already present so that all the activities underneath a row (like when you add a line to Excel). If it is not possible to do this, it means that every time you want to add a line you have to manually move all the activities and this would mean not being able to use the component. Unfortunately we have done a lot of work but it won't help because every time we need to add a line we should lose hours to move all the activities. Moreover having many activities in the back end the component becomes very slow, practically we would be obliged to look for another solution otherwise there is a workaround.