Cover the previously-untested, highest-risk parsing in
fetch_water_data_for_date by mocking the HTTP call:
- hour 1-23 map to the same day; hour 24 rolls to next-day midnight
- qvalues "***" / None yield discharge None (no crash)
- None water level is skipped
- out-of-range (0, 25) and empty hourlytime rows are skipped
- missing "rows" key returns an empty list
This gives the scraper a safety net before its module is split.
grabowski
08dc536c93