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fix(elecprice): survive a day-ahead source that has not published yet

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Every morning before the day-ahead auction is published, /v1/prediction/update
answered 400 and no prediction was produced at all.

The provider asks for prices starting at the run day, because an existing
history sets past_days to 0. The optimization horizon always reaches past the
last published price, so an update is always considered necessary - and SMARD
publishes the next day around midday. Between midnight and publication the
requested window therefore contains nothing, and ElecPriceSMARD raised
"SMARD response contains no usable day-ahead prices", which failed the whole
prediction update rather than only that provider.

ElecPriceEnergyCharts and its SMARD subclass now keep their existing history and
let the ETS/median branch extrapolate the remaining slots, the same fallback
FeedInTariffEnergyCharts already had. A cold start without any history stays
fatal. ElecPriceSMARD also separates the two cases it used to conflate: a period
the source has not published yet now reports the latest value it does have, and
only a response without a single price still reads as unusable.

Fixes the cache noise this produced as well. cache_in_file claimed its cache
entry before calling the wrapped function, so a raising function left an empty
file behind and every later call within the TTL logged "Read failed: Ran out of
input" before refetching. The entry is now created only after the call returns.
This commit is contained in:
Andreas
2026-09-09 12:57:39 +02:00
parent 280ee761e6
commit 983a23f0af
7 changed files with 183 additions and 20 deletions
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CHANGELOG.md
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@@ -231,6 +231,19 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
historical data exists, the existing history is kept and the remaining slots are
extrapolated via ETS instead of failing. A genuine cold start (no data at all) still
fails.
- A day-ahead price source that has not published the next day yet no longer fails the whole
prediction update. `ElecPriceEnergyCharts` and its `ElecPriceSMARD` subclass ask for prices
starting at the run day, while the optimization horizon always reaches past the last published
price, so every morning before the auction is published the request came back empty and the
provider raised - answering `/v1/prediction/update` with 400 until the source caught up. The
provider now keeps its existing history and extrapolates the remaining slots via ETS, the same
way `FeedInTariffEnergyCharts` already did. A cold start with no history at all still fails.
- `ElecPriceSMARD` now distinguishes a lagging publication from a broken response. A window the
source cannot serve yet reports the latest value it does have, instead of claiming the response
contained no usable prices.
- `cache_in_file` no longer leaves an empty cache entry behind when the wrapped function raises.
The entry was claimed before the call, so every later call within the TTL first failed to read
it ("Ran out of input") before refetching. The entry is now created only after the call returns.
- The deprecated `/gesamtlast` endpoint no longer forces a full provider refresh on every
call. Forcing bypassed the provider caches and hammered external APIs, so a single flaky
provider could 404 the whole load prediction. It now defaults to a cache-aware update and