This need not be a completely new addition to UI. Mostly backend work.
Ideas
Change DatePickerRange Component with to seperate datepickers. The end date picker component is only rendered if a "now" toggle is swithed off. If "now" is switched on a refresh button for updating with the newest availeable data is rendered instead
Data that needs to be retrieved
Pumpstation data, outflow and swamp levels (most recent hour)
weather data, temprature, precipitation, snow (hour vals) and weather forecast (current and next day?)
tide data, current and forecast, same as above
What to do with the new data
Needs to be stored in current file structure, and then update graph as normal, without specifying end date.
This need not be a completely new addition to UI. Mostly backend work.
Ideas
Data that needs to be retrieved
What to do with the new data