Почему: файлы в main были отформатированы старым ruff (хук 0.7.4), а после
#3021 хук, CI и `uv run ruff format` — на 0.15.20. Без нормализации каждый
коммит, касающийся одного из этих 161 файлов, тащил бы посторонние хунки
на нетронутых строках (длинные assert-сообщения и т.п.).
Что: `ruff format` 0.15.20 по backend/ и tradein-mvp/backend/; ничего,
кроме форматирования (958+/1034−). `ruff check` 0.15.20 зелёный на обоих
проектах, повторный `format --check` — 1001 файл без изменений
(идемпотентно), compileall чистый.
Refs #2864
_count_full_years treated units=0 as a valid observation, so a series
where fill_month_grid zero-filled every month still accumulated 3 full
years and passed the _MIN_FULL_YEARS guard. Zero-filled months carry no
seasonal signal, so they must be skipped in the year counter — the same
way None values already were.
Fix: skip v==0 alongside v is None in _count_full_years.
Add four tests: zero-filled 36-month series → n_full_years=0/applied=False;
partial-coverage years (only 6 non-zero months/year) → not counted as full;
real non-zero series still passes guard; normalize_demand on zero-filled
SalesSeries returns series unchanged.
REOPENED — normalize.py was never created; only rate-regime discount existed.
New backend/app/services/forecasting/normalize.py with normalize_demand(series):
multiplicative month-of-year deseasonalization of the raw monthly demand
SalesSeries (§9.4). Pure/deterministic; min-data guard (<2 full years / empty
month / overall_mean<=0 → factor 1.0, no divide-by-zero, no thin-data noise).
Exposes seasonal factors for explainability. Synthetic unit test: seasonality
removed (month means equalised), flat unchanged, thin/empty/all-zero safe.
DoD (module + doc + test) MET. Production wiring into
rate_sensitivity._align_sales_deltas DEFERRED (documented TODO): deseasonalizing
the short rate-driven series perturbs the recovered β/lag on current data —
needs a points-per-month gate / joint seasonal+rate estimation + backtest before
wiring. Forecast stack is advisory regardless. Refs #979
