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No PV forecast modelled snow lying on the modules, so after a snowfall the optimizer planned with PV that never came. The local Open-Meteo/pvlib backend can now reduce the forecast by the snow coverage (opt-in via pvforecast.akkudoktor.snow_enabled): - Request hourly snowfall and snow depth with the weather and run the NREL snow coverage model (pvlib.snow) per plane. - Correct the coverage with measured PV production: production above the model clears it at once; low production raises it only while snow is plausible, so curtailment and inverter outages are not learned as snow. Persisting snow damps the slide rate, fading with snow_feedback_memory_hours. - Rebuild the coverage from snow_lookback_days on every update instead of storing state. - Exclude intervals with possible snow from the calibration fit. - Warn when PV meter readings are missing or stale; ignore impossible meter jumps. _plane_power keeps its two-value signature (used by the adaptive provider in #1422); the irradiance comes from the new _plane_power_and_poa. Tests replay real February 2026 data from one plant (snow on 02-19/20). Signed-off-by: SchaafAlexander <86607129+SchaafAlexander@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>