Original PR description

In the demo data, we have two records with expressions like
```py
start_date = datetime.today() - relativedelta(weeks=2, weekday=4)
end_date = datetime.today() - relativedelta(weeks=2, weekday=5)
```
On 2024-03-23 (Saturday), these expressions give the values
```py
start_date = datetime.date(2024, 3, 15)
end_date = datetime.date(2024, 3, 9)
```
which makes a constraint checking `start_date < end_date` fail.

In order to make the computation correct, the solution is to compute end_date like start_date and add an extra day, like in
```py
start_date = datetime.today() - relativedelta(weeks=2, weekday=4)
end_date = start_date + relativedelta(days=1)
```