The producer-only path left older hours stuck at 0% HRRR coverage
forever once their fetch tasks drained: the rolling-window cron only
re-passes the prior hour, so manual lookback runs (or any
out-of-window hour) wrote NULL samples + enqueued tasks, then never
re-ran to UPSERT the now-landed HRRR data.
Fix: split the responsibility cleanly.
* CalibrationSampler.build_for_hour/1 now returns
%{upserted: int, missing_hrrr_cells: int} so callers know whether
the producer enqueued anything (i.e. whether a follow-up makes
sense). Spec-tightened with a new @type result.
* PskrCalibrationWorker, after each hour's sampler pass, schedules a
follow-up of itself for that exact hour 10 min later when missing
> 0. The follow-up carries args %{"hour_utc" => ..., "_follow_up"
=> true}; the sentinel prevents follow-ups from chaining further
follow-ups (rolling-window cron is the safety net).
Tests:
* Updated 4 existing sampler tests to the new map return shape.
* Moved the follow-up assertions from the sampler suite into the
worker suite where they belong (sampler is now scheduling-free).
* Added 3 worker tests: schedules-when-missing, no-schedule-when-
covered, follow-up-doesn't-chain.
3313 tests + 228 properties, 0 failures.
Graham McIntire
fe2ad2df15