Let predict_quality() not delete all existing predictions before adding the
new predictions. Instead, update predictions that already exist in the
database with PUT and add only those new predictions with POST that are not
yet in the database.
Remove arg "user_id" from determine_days_to_predict() -> do not read
prediction period from a special bathing spot "Vorhersagedatum".
Avoid date duplicates by calculating daily means within predict_quality()
Create only four plots (remove "Modellimplikationen")
predict_quality()
not delete all existing predictions before adding the new predictions. Instead, update predictions that already exist in the database with PUT and add only those new predictions with POST that are not yet in the database.determine_days_to_predict()
-> do not read prediction period from a special bathing spot "Vorhersagedatum".within predict_quality()
This change is