diff --git a/tradein-mvp/backend/data/sql/108_merge_duplicate_houses.sql b/tradein-mvp/backend/data/sql/108_merge_duplicate_houses.sql
index beb9992e..e66019af 100644
--- a/tradein-mvp/backend/data/sql/108_merge_duplicate_houses.sql
+++ b/tradein-mvp/backend/data/sql/108_merge_duplicate_houses.sql
@@ -23,7 +23,7 @@
 --   house_imv_evaluations  (house_id)     — CASCADE    — UNIQUE(house_id) → dedup
 --   house_suggestions      (house_id)     — CASCADE    — UNIQUE(house_id, ext_item_id) → dedup
 --   external_valuations    (house_id)     — CASCADE    — нет ограничивающего UNIQUE
---   address_mismatch_audit (house_id)     — CASCADE    — нет ограничивающего UNIQUE
+--   address_mismatch_audit (house_id)     — CASCADE    — UNIQUE(house_id,audit_batch) → dedup
 --
 -- Идемпотентность: все UPDATE/DELETE ищут по mapping временной таблицы. При повторном
 --   запуске mapping будет пустым (дублей нет) → все UPDATE/DELETE затронут 0 строк → no-op.
@@ -80,7 +80,7 @@ clusters_with_count AS (
 ),
 -- Только дома, входящие в кластер-дубль
 dup_houses AS (
-    SELECT h.id, c.cluster_key
+    SELECT h.id, cl.cluster_key
     FROM houses h
     JOIN clustered cl ON cl.id = h.id
     JOIN clusters_with_count cw ON cw.cluster_key = cl.cluster_key
@@ -203,47 +203,58 @@ FROM _108_dup_mapping m
 WHERE haa.house_id = m.dup_id;
 
 -- 3c. houses_price_dynamics  UNIQUE(house_id, month_date, source)
---   Удалить строки дубля, у которых (month_date,source) уже есть у canonical.
-DELETE FROM houses_price_dynamics hpd
-USING _108_dup_mapping m
-WHERE hpd.house_id = m.dup_id
-  AND EXISTS (
-      SELECT 1 FROM houses_price_dynamics hpd2
-      WHERE hpd2.house_id = m.canonical_id
-        AND hpd2.month_date = hpd.month_date
-        AND hpd2.source = hpd.source
-  );
---   Репойнтить оставшиеся
+--   Collision-safe: дедуп по ЦЕЛЕВОМУ ключу (canonical, month_date, source) —
+--   ловит и dup-vs-canonical, и dup-vs-dup в кластерах >2. Выживает строка
+--   canonical'а (m.canonical_id IS NULL), иначе минимальный id.
+DELETE FROM houses_price_dynamics t
+USING (
+    SELECT t2.id,
+           ROW_NUMBER() OVER (
+               PARTITION BY COALESCE(m.canonical_id, t2.house_id), t2.month_date, t2.source
+               ORDER BY (m.canonical_id IS NULL) DESC, t2.id ASC
+           ) AS rn
+    FROM houses_price_dynamics t2
+    LEFT JOIN _108_dup_mapping m ON m.dup_id = t2.house_id
+) d
+WHERE t.id = d.id AND d.rn > 1;
+--   Репойнтить оставшиеся (целевой ключ теперь свободен)
 UPDATE houses_price_dynamics hpd
 SET house_id = m.canonical_id
 FROM _108_dup_mapping m
 WHERE hpd.house_id = m.dup_id;
 
--- 3d. house_imv_evaluations  UNIQUE(house_id) — у canonical уже может быть запись
---   Удалить строки дубля если canonical уже имеет evaluation.
-DELETE FROM house_imv_evaluations hie
-USING _108_dup_mapping m
-WHERE hie.house_id = m.dup_id
-  AND EXISTS (
-      SELECT 1 FROM house_imv_evaluations hie2
-      WHERE hie2.house_id = m.canonical_id
-  );
---   Репойнтить оставшиеся (canonical не имеет evaluation — забираем от дубля)
+-- 3d. house_imv_evaluations  UNIQUE(house_id)
+--   Collision-safe: одна evaluation на canonical. Выживает canonical'а, иначе min id.
+DELETE FROM house_imv_evaluations t
+USING (
+    SELECT t2.id,
+           ROW_NUMBER() OVER (
+               PARTITION BY COALESCE(m.canonical_id, t2.house_id)
+               ORDER BY (m.canonical_id IS NULL) DESC, t2.id ASC
+           ) AS rn
+    FROM house_imv_evaluations t2
+    LEFT JOIN _108_dup_mapping m ON m.dup_id = t2.house_id
+) d
+WHERE t.id = d.id AND d.rn > 1;
+--   Репойнтить оставшиеся
 UPDATE house_imv_evaluations hie
 SET house_id = m.canonical_id
 FROM _108_dup_mapping m
 WHERE hie.house_id = m.dup_id;
 
 -- 3e. house_suggestions  UNIQUE(house_id, ext_item_id)
---   Удалить строки дубля, у которых (ext_item_id) уже есть у canonical.
-DELETE FROM house_suggestions hs
-USING _108_dup_mapping m
-WHERE hs.house_id = m.dup_id
-  AND EXISTS (
-      SELECT 1 FROM house_suggestions hs2
-      WHERE hs2.house_id = m.canonical_id
-        AND hs2.ext_item_id = hs.ext_item_id
-  );
+--   Collision-safe: дедуп по (canonical, ext_item_id) — ловит dup-vs-dup.
+DELETE FROM house_suggestions t
+USING (
+    SELECT t2.id,
+           ROW_NUMBER() OVER (
+               PARTITION BY COALESCE(m.canonical_id, t2.house_id), t2.ext_item_id
+               ORDER BY (m.canonical_id IS NULL) DESC, t2.id ASC
+           ) AS rn
+    FROM house_suggestions t2
+    LEFT JOIN _108_dup_mapping m ON m.dup_id = t2.house_id
+) d
+WHERE t.id = d.id AND d.rn > 1;
 --   Репойнтить оставшиеся
 UPDATE house_suggestions hs
 SET house_id = m.canonical_id
@@ -268,7 +279,20 @@ SET house_id = m.canonical_id
 FROM _108_dup_mapping m
 WHERE ev.house_id = m.dup_id;
 
--- 3i. address_mismatch_audit (CASCADE, нет блокирующего UNIQUE)
+-- 3i. address_mismatch_audit  UNIQUE(house_id, audit_batch) — collision-safe
+--   (заголовок ранее ошибочно помечал «нет блокирующего UNIQUE»).
+DELETE FROM address_mismatch_audit t
+USING (
+    SELECT t2.id,
+           ROW_NUMBER() OVER (
+               PARTITION BY COALESCE(m.canonical_id, t2.house_id), t2.audit_batch
+               ORDER BY (m.canonical_id IS NULL) DESC, t2.id ASC
+           ) AS rn
+    FROM address_mismatch_audit t2
+    LEFT JOIN _108_dup_mapping m ON m.dup_id = t2.house_id
+) d
+WHERE t.id = d.id AND d.rn > 1;
+--   Репойнтить оставшиеся
 UPDATE address_mismatch_audit ama
 SET house_id = m.canonical_id
 FROM _108_dup_mapping m