-- 0046_context_time_weight.up.sql — time-of-day/weekday context conditioning
-- (#1531, milestone #160 Opt 3). Adds a per-profile scoring weight for the new
-- context-affinity term: how strongly a candidate is boosted when its artist's
-- play history concentrates in the current daypart × weekday-type cell (in the
-- user's local timezone). Mirrors the other ScoringWeights columns.
--
-- DEFAULT 1.0 backfills both existing profile rows to a modest on-value; the
-- Go ShippedRadioWeights/ShippedDailyMixWeights carry the same 1.0 so fresh
-- installs seed identically. Reconcile only seeds MISSING rows (ON CONFLICT DO
-- NOTHING), so existing rows rely on this DEFAULT until an operator resets.
ALTER TABLE recommendation_weight_profiles
    ADD COLUMN context_time_weight double precision NOT NULL DEFAULT 1.0;