feat(db): v_bucket_success_score view (success-driven mix #25)

data/sql/86_v_bucket_success_score.sql

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+-- 86_v_bucket_success_score.sql
+-- Context: Success-driven bucket ranking view for recommend_mix (issue #25).
+-- Per-(district × class × room_bucket) aggregates from domrf_kn_flats + domrf_kn_objects
+-- over the last 24 months, with Z-scores normalised per (district, class) group.
+-- Used in recommend_mix to bias recommendations toward buckets with high velocity + price.
+--
+-- Dependencies:
+--   domrf_kn_flats   — total_area, rooms, price_per_m2, obj_id, region_cd, snapshot_date
+--   domrf_kn_objects — obj_id, district_name, obj_class, region_cd, snapshot_date
+--   domrf_kn_sale_graph — obj_id, report_month, contracted, snapshot_date
+--
+-- Deploy order: standalone, no prior migration needed.
+-- Idempotent: CREATE OR REPLACE VIEW.
+
+BEGIN;
+
+CREATE OR REPLACE VIEW v_bucket_success_score AS
+WITH
+-- Latest snapshot per object (both tables are time-series)
+latest_obj AS (
+    SELECT DISTINCT ON (obj_id)
+        obj_id, district_name, obj_class, region_cd
+    FROM domrf_kn_objects
+    WHERE district_name IS NOT NULL
+    ORDER BY obj_id, snapshot_date DESC
+),
+
+bucket_aggs AS (
+    SELECT
+        o.district_name,
+        COALESCE(o.obj_class, 'Comfort') AS obj_class,
+        CASE
+            WHEN f.rooms = 0 OR f.total_area < 30 THEN 'Студии 15-30'
+            WHEN f.total_area < 45              THEN '1-к 30-45'
+            WHEN f.total_area < 60              THEN '2-к 45-60'
+            WHEN f.total_area < 80              THEN '3-к 60-80'
+            ELSE '80+ м²'
+        END AS bucket,
+        AVG(NULLIF(f.price_per_m2, 0))   AS avg_price_per_m2,
+        AVG(NULLIF(f.total_area,   0))   AS avg_area_m2,
+        COUNT(*)                         AS n_deals,
+        -- Velocity proxy: avg monthly contracted units per object, over last 24 months
+        AVG(
+            (SELECT AVG(sg.contracted)
+               FROM domrf_kn_sale_graph sg
+              WHERE sg.obj_id = o.obj_id
+                AND sg.report_month > NOW() - INTERVAL '24 months')
+        ) AS avg_velocity_per_month
+    FROM domrf_kn_flats f
+    JOIN latest_obj o ON o.obj_id = f.obj_id
+    WHERE f.total_area BETWEEN 15 AND 200
+      AND f.price_per_m2 BETWEEN 30000 AND 500000
+      AND o.region_cd = 66
+      AND f.snapshot_date > CURRENT_DATE - INTERVAL '24 months'
+    GROUP BY 1, 2, 3
+    HAVING COUNT(*) >= 30  -- статистически значимая выборка
+),
+
+z_scores AS (
+    SELECT
+        district_name, obj_class, bucket,
+        n_deals, avg_price_per_m2, avg_area_m2, avg_velocity_per_month,
+        -- Z-score нормированный по группе (district × class)
+        (avg_velocity_per_month
+            - AVG(avg_velocity_per_month) OVER (PARTITION BY district_name, obj_class))
+            / NULLIF(STDDEV(avg_velocity_per_month) OVER (PARTITION BY district_name, obj_class), 0)
+            AS velocity_z,
+        (avg_price_per_m2
+            - AVG(avg_price_per_m2) OVER (PARTITION BY district_name, obj_class))
+            / NULLIF(STDDEV(avg_price_per_m2) OVER (PARTITION BY district_name, obj_class), 0)
+            AS price_z,
+        (avg_area_m2
+            - AVG(avg_area_m2) OVER (PARTITION BY district_name, obj_class))
+            / NULLIF(STDDEV(avg_area_m2) OVER (PARTITION BY district_name, obj_class), 0)
+            AS area_z
+    FROM bucket_aggs
+)
+
+SELECT
+    district_name,
+    obj_class,
+    bucket,
+    n_deals,
+    avg_price_per_m2,
+    avg_area_m2,
+    avg_velocity_per_month,
+    COALESCE(velocity_z, 0) * 0.5
+        + COALESCE(price_z,    0) * 0.3
+        - COALESCE(area_z,     0) * 0.2  AS success_score,
+    COALESCE(velocity_z, 0)              AS velocity_z,
+    COALESCE(price_z,    0)              AS price_z,
+    COALESCE(area_z,     0)              AS area_z
+FROM z_scores
+ORDER BY district_name, obj_class, success_score DESC;
+
+COMMENT ON VIEW v_bucket_success_score IS
+    'Success-driven bucket ranking per (district, class). '
+    'Z-scores: velocity (+) приоритет, price (+) приоритет, area (-) приоритет. '
+    'Min 30 сделок в группе. '
+    'Используется recommend_mix для смещения рекомендации (issue #25).';
+
+COMMIT;